Hadoop Distributed File System - HDFS

The connector offers Flows and Sources that interact with HDFS file systems.

For more information about Hadoop, please visit the Hadoop documentation.

Project Info: Alpakka HDFS
Artifact
com.lightbend.akka
akka-stream-alpakka-hdfs
2.0.0-RC1
JDK versions
Adopt OpenJDK 8
Adopt OpenJDK 11
Scala versions2.12.10, 2.11.12, 2.13.1
JPMS module nameakka.stream.alpakka.hdfs
License
Readiness level
Since 0.20, 2018-07-04
Home pagehttps://doc.akka.io/docs/alpakka/current
API documentation
Forums
Release notesIn the documentation
IssuesGithub issues
Sourceshttps://github.com/akka/alpakka

Artifacts

sbt
val AkkaVersion = "2.5.30"
libraryDependencies ++= Seq(
  "com.lightbend.akka" %% "akka-stream-alpakka-hdfs" % "2.0.0-RC1",
  "com.typesafe.akka" %% "akka-stream" % AkkaVersion
)
Maven
<properties>
  <akka.version>2.5.30</akka.version>
</properties>
<dependency>
  <groupId>com.lightbend.akka</groupId>
  <artifactId>akka-stream-alpakka-hdfs_2.12</artifactId>
  <version>2.0.0-RC1</version>
</dependency>
<dependency>
  <groupId>com.typesafe.akka</groupId>
  <artifactId>akka-stream_2.12</artifactId>
  <version>${akka.version}</version>
</dependency>
Gradle
versions += [
  AkkaVersion: "2.5.30"
]
dependencies {
  compile group: 'com.lightbend.akka', name: 'akka-stream-alpakka-hdfs_2.12', version: '2.0.0-RC1',
  compile group: 'com.typesafe.akka', name: 'akka-stream_2.12', version: versions.AkkaVersion
}

The table below shows direct dependencies of this module and the second tab shows all libraries it depends on transitively.

Direct dependencies
OrganizationArtifactVersion
com.typesafe.akkaakka-stream_2.122.5.30
org.apache.hadoophadoop-client3.1.1
org.scala-langscala-library2.12.10
org.typelevelcats-core_2.122.0.0
Dependency tree
com.typesafe.akka    akka-stream_2.12    2.5.30
    com.typesafe.akka    akka-actor_2.12    2.5.30
        com.typesafe    config    1.3.3
        org.scala-lang.modules    scala-java8-compat_2.12    0.8.0
    com.typesafe.akka    akka-protobuf_2.12    2.5.30
    com.typesafe    ssl-config-core_2.12    0.3.8
        com.typesafe    config    1.3.3
        org.scala-lang.modules    scala-parser-combinators_2.12    1.1.2
    org.reactivestreams    reactive-streams    1.0.2
org.apache.hadoop    hadoop-client    3.1.1
    org.apache.hadoop    hadoop-annotations    3.1.1
    org.apache.hadoop    hadoop-common    3.1.1
        com.fasterxml.jackson.core    jackson-databind    2.7.8
            com.fasterxml.jackson.core    jackson-annotations    2.7.8
            com.fasterxml.jackson.core    jackson-core    2.8.8
        com.fasterxml.woodstox    woodstox-core    5.0.3
            org.codehaus.woodstox    stax2-api    3.1.4
        com.google.code.findbugs    jsr305    3.0.0
        com.google.code.gson    gson    2.2.4
        com.google.guava    guava    16.0.1
        com.google.protobuf    protobuf-java    2.5.0
        com.google.re2j    re2j    1.1
        com.sun.jersey    jersey-servlet    1.19
            com.sun.jersey    jersey-server    1.19
                com.sun.jersey    jersey-core    1.19
                    javax.ws.rs    jsr311-api    1.1.1
        commons-beanutils    commons-beanutils    1.9.3
            commons-collections    commons-collections    3.2.2
            commons-logging    commons-logging    1.2
        commons-cli    commons-cli    1.2
        commons-codec    commons-codec    1.11
        commons-collections    commons-collections    3.2.2
        commons-io    commons-io    2.5
        commons-lang    commons-lang    2.6
        commons-logging    commons-logging    1.2
        commons-net    commons-net    3.6
        javax.servlet.jsp    jsp-api    2.1
        org.apache.avro    avro    1.7.7
            com.thoughtworks.paranamer    paranamer    2.3
            org.apache.commons    commons-compress    1.4.1
                org.tukaani    xz    1.0
            org.codehaus.jackson    jackson-core-asl    1.9.13
            org.codehaus.jackson    jackson-mapper-asl    1.9.13
                org.codehaus.jackson    jackson-core-asl    1.9.13
            org.slf4j    slf4j-api    1.7.29
            org.xerial.snappy    snappy-java    1.0.5
        org.apache.commons    commons-compress    1.4.1
            org.tukaani    xz    1.0
        org.apache.commons    commons-configuration2    2.1.1
            commons-logging    commons-logging    1.2
        org.apache.commons    commons-lang3    3.4
        org.apache.commons    commons-math3    3.1.1
        org.apache.curator    curator-client    2.12.0
            com.google.guava    guava    16.0.1
            org.apache.zookeeper    zookeeper    3.4.9
                jline    jline    0.9.94
                org.slf4j    slf4j-api    1.7.29
            org.slf4j    slf4j-api    1.7.29
        org.apache.curator    curator-recipes    2.12.0
            org.apache.curator    curator-framework    2.12.0
                org.apache.curator    curator-client    2.12.0
                    com.google.guava    guava    16.0.1
                    org.apache.zookeeper    zookeeper    3.4.9
                        jline    jline    0.9.94
                        org.slf4j    slf4j-api    1.7.29
                    org.slf4j    slf4j-api    1.7.29
        org.apache.hadoop    hadoop-annotations    3.1.1
        org.apache.hadoop    hadoop-auth    3.1.1
            com.google.guava    guava    16.0.1
            com.nimbusds    nimbus-jose-jwt    4.41.1
                com.github.stephenc.jcip    jcip-annotations    1.0-1
                net.minidev    json-smart    2.3
                    net.minidev    accessors-smart    1.2
                        org.ow2.asm    asm    5.0.4
            commons-codec    commons-codec    1.11
            net.minidev    json-smart    2.3
                net.minidev    accessors-smart    1.2
                    org.ow2.asm    asm    5.0.4
            org.apache.curator    curator-framework    2.12.0
                org.apache.curator    curator-client    2.12.0
                    com.google.guava    guava    16.0.1
                    org.apache.zookeeper    zookeeper    3.4.9
                        jline    jline    0.9.94
                        org.slf4j    slf4j-api    1.7.29
                    org.slf4j    slf4j-api    1.7.29
            org.apache.httpcomponents    httpclient    4.5.2
                commons-codec    commons-codec    1.11
                commons-logging    commons-logging    1.2
                org.apache.httpcomponents    httpcore    4.4.4
            org.apache.kerby    kerb-simplekdc    1.0.1
                org.apache.kerby    kerb-admin    1.0.1
                    org.apache.kerby    kerb-server    1.0.1
                        org.apache.kerby    kerb-common    1.0.1
                            commons-io    commons-io    2.5
                            org.apache.kerby    kerb-crypto    1.0.1
                                org.apache.kerby    kerb-core    1.0.1
                                    org.apache.kerby    kerby-pkix    1.0.1
                                        org.apache.kerby    kerby-asn1    1.0.1
                                        org.apache.kerby    kerby-util    1.0.1
                                        org.slf4j    slf4j-api    1.7.29
                                org.apache.kerby    kerby-util    1.0.1
                            org.apache.kerby    kerby-config    1.0.1
                                org.slf4j    slf4j-api    1.7.29
                        org.apache.kerby    kerb-identity    1.0.1
                            org.apache.kerby    kerb-core    1.0.1
                                org.apache.kerby    kerby-pkix    1.0.1
                                    org.apache.kerby    kerby-asn1    1.0.1
                                    org.apache.kerby    kerby-util    1.0.1
                                    org.slf4j    slf4j-api    1.7.29
                            org.apache.kerby    kerby-config    1.0.1
                                org.slf4j    slf4j-api    1.7.29
                    org.apache.kerby    kerb-util    1.0.1
                        org.apache.kerby    kerb-core    1.0.1
                            org.apache.kerby    kerby-pkix    1.0.1
                                org.apache.kerby    kerby-asn1    1.0.1
                                org.apache.kerby    kerby-util    1.0.1
                                org.slf4j    slf4j-api    1.7.29
                        org.apache.kerby    kerb-crypto    1.0.1
                            org.apache.kerby    kerb-core    1.0.1
                                org.apache.kerby    kerby-pkix    1.0.1
                                    org.apache.kerby    kerby-asn1    1.0.1
                                    org.apache.kerby    kerby-util    1.0.1
                                    org.slf4j    slf4j-api    1.7.29
                            org.apache.kerby    kerby-util    1.0.1
                        org.apache.kerby    kerby-config    1.0.1
                            org.slf4j    slf4j-api    1.7.29
                    org.apache.kerby    kerby-xdr    1.0.1
                org.apache.kerby    kerb-client    1.0.1
                    org.apache.kerby    kerb-common    1.0.1
                        commons-io    commons-io    2.5
                        org.apache.kerby    kerb-crypto    1.0.1
                            org.apache.kerby    kerb-core    1.0.1
                                org.apache.kerby    kerby-pkix    1.0.1
                                    org.apache.kerby    kerby-asn1    1.0.1
                                    org.apache.kerby    kerby-util    1.0.1
                                    org.slf4j    slf4j-api    1.7.29
                            org.apache.kerby    kerby-util    1.0.1
                        org.apache.kerby    kerby-config    1.0.1
                            org.slf4j    slf4j-api    1.7.29
                    org.apache.kerby    kerb-core    1.0.1
                        org.apache.kerby    kerby-pkix    1.0.1
                            org.apache.kerby    kerby-asn1    1.0.1
                            org.apache.kerby    kerby-util    1.0.1
                            org.slf4j    slf4j-api    1.7.29
                    org.apache.kerby    kerb-util    1.0.1
                        org.apache.kerby    kerb-core    1.0.1
                            org.apache.kerby    kerby-pkix    1.0.1
                                org.apache.kerby    kerby-asn1    1.0.1
                                org.apache.kerby    kerby-util    1.0.1
                                org.slf4j    slf4j-api    1.7.29
                        org.apache.kerby    kerb-crypto    1.0.1
                            org.apache.kerby    kerb-core    1.0.1
                                org.apache.kerby    kerby-pkix    1.0.1
                                    org.apache.kerby    kerby-asn1    1.0.1
                                    org.apache.kerby    kerby-util    1.0.1
                                    org.slf4j    slf4j-api    1.7.29
                            org.apache.kerby    kerby-util    1.0.1
                        org.apache.kerby    kerby-config    1.0.1
                            org.slf4j    slf4j-api    1.7.29
                    org.apache.kerby    kerby-config    1.0.1
                        org.slf4j    slf4j-api    1.7.29
                    org.apache.kerby    token-provider    1.0.1
                        com.nimbusds    nimbus-jose-jwt    4.41.1
                            com.github.stephenc.jcip    jcip-annotations    1.0-1
                            net.minidev    json-smart    2.3
                                net.minidev    accessors-smart    1.2
                                    org.ow2.asm    asm    5.0.4
                        org.apache.kerby    kerb-core    1.0.1
                            org.apache.kerby    kerby-pkix    1.0.1
                                org.apache.kerby    kerby-asn1    1.0.1
                                org.apache.kerby    kerby-util    1.0.1
                                org.slf4j    slf4j-api    1.7.29
            org.apache.zookeeper    zookeeper    3.4.9
                jline    jline    0.9.94
                org.slf4j    slf4j-api    1.7.29
            org.slf4j    slf4j-api    1.7.29
        org.apache.htrace    htrace-core4    4.1.0-incubating
        org.apache.httpcomponents    httpclient    4.5.2
            commons-codec    commons-codec    1.11
            commons-logging    commons-logging    1.2
            org.apache.httpcomponents    httpcore    4.4.4
        org.apache.kerby    kerb-simplekdc    1.0.1
            org.apache.kerby    kerb-admin    1.0.1
                org.apache.kerby    kerb-server    1.0.1
                    org.apache.kerby    kerb-common    1.0.1
                        commons-io    commons-io    2.5
                        org.apache.kerby    kerb-crypto    1.0.1
                            org.apache.kerby    kerb-core    1.0.1
                                org.apache.kerby    kerby-pkix    1.0.1
                                    org.apache.kerby    kerby-asn1    1.0.1
                                    org.apache.kerby    kerby-util    1.0.1
                                    org.slf4j    slf4j-api    1.7.29
                            org.apache.kerby    kerby-util    1.0.1
                        org.apache.kerby    kerby-config    1.0.1
                            org.slf4j    slf4j-api    1.7.29
                    org.apache.kerby    kerb-identity    1.0.1
                        org.apache.kerby    kerb-core    1.0.1
                            org.apache.kerby    kerby-pkix    1.0.1
                                org.apache.kerby    kerby-asn1    1.0.1
                                org.apache.kerby    kerby-util    1.0.1
                                org.slf4j    slf4j-api    1.7.29
                        org.apache.kerby    kerby-config    1.0.1
                            org.slf4j    slf4j-api    1.7.29
                org.apache.kerby    kerb-util    1.0.1
                    org.apache.kerby    kerb-core    1.0.1
                        org.apache.kerby    kerby-pkix    1.0.1
                            org.apache.kerby    kerby-asn1    1.0.1
                            org.apache.kerby    kerby-util    1.0.1
                            org.slf4j    slf4j-api    1.7.29
                    org.apache.kerby    kerb-crypto    1.0.1
                        org.apache.kerby    kerb-core    1.0.1
                            org.apache.kerby    kerby-pkix    1.0.1
                                org.apache.kerby    kerby-asn1    1.0.1
                                org.apache.kerby    kerby-util    1.0.1
                                org.slf4j    slf4j-api    1.7.29
                        org.apache.kerby    kerby-util    1.0.1
                    org.apache.kerby    kerby-config    1.0.1
                        org.slf4j    slf4j-api    1.7.29
                org.apache.kerby    kerby-xdr    1.0.1
            org.apache.kerby    kerb-client    1.0.1
                org.apache.kerby    kerb-common    1.0.1
                    commons-io    commons-io    2.5
                    org.apache.kerby    kerb-crypto    1.0.1
                        org.apache.kerby    kerb-core    1.0.1
                            org.apache.kerby    kerby-pkix    1.0.1
                                org.apache.kerby    kerby-asn1    1.0.1
                                org.apache.kerby    kerby-util    1.0.1
                                org.slf4j    slf4j-api    1.7.29
                        org.apache.kerby    kerby-util    1.0.1
                    org.apache.kerby    kerby-config    1.0.1
                        org.slf4j    slf4j-api    1.7.29
                org.apache.kerby    kerb-core    1.0.1
                    org.apache.kerby    kerby-pkix    1.0.1
                        org.apache.kerby    kerby-asn1    1.0.1
                        org.apache.kerby    kerby-util    1.0.1
                        org.slf4j    slf4j-api    1.7.29
                org.apache.kerby    kerb-util    1.0.1
                    org.apache.kerby    kerb-core    1.0.1
                        org.apache.kerby    kerby-pkix    1.0.1
                            org.apache.kerby    kerby-asn1    1.0.1
                            org.apache.kerby    kerby-util    1.0.1
                            org.slf4j    slf4j-api    1.7.29
                    org.apache.kerby    kerb-crypto    1.0.1
                        org.apache.kerby    kerb-core    1.0.1
                            org.apache.kerby    kerby-pkix    1.0.1
                                org.apache.kerby    kerby-asn1    1.0.1
                                org.apache.kerby    kerby-util    1.0.1
                                org.slf4j    slf4j-api    1.7.29
                        org.apache.kerby    kerby-util    1.0.1
                    org.apache.kerby    kerby-config    1.0.1
                        org.slf4j    slf4j-api    1.7.29
                org.apache.kerby    kerby-config    1.0.1
                    org.slf4j    slf4j-api    1.7.29
                org.apache.kerby    token-provider    1.0.1
                    com.nimbusds    nimbus-jose-jwt    4.41.1
                        com.github.stephenc.jcip    jcip-annotations    1.0-1
                        net.minidev    json-smart    2.3
                            net.minidev    accessors-smart    1.2
                                org.ow2.asm    asm    5.0.4
                    org.apache.kerby    kerb-core    1.0.1
                        org.apache.kerby    kerby-pkix    1.0.1
                            org.apache.kerby    kerby-asn1    1.0.1
                            org.apache.kerby    kerby-util    1.0.1
                            org.slf4j    slf4j-api    1.7.29
        org.codehaus.woodstox    stax2-api    3.1.4
        org.eclipse.jetty    jetty-servlet    9.3.19.v20170502
            org.eclipse.jetty    jetty-security    9.3.19.v20170502
        org.eclipse.jetty    jetty-webapp    9.3.19.v20170502
            org.eclipse.jetty    jetty-servlet    9.3.19.v20170502
                org.eclipse.jetty    jetty-security    9.3.19.v20170502
            org.eclipse.jetty    jetty-xml    9.3.19.v20170502
        org.slf4j    slf4j-api    1.7.29
    org.apache.hadoop    hadoop-hdfs-client    3.1.1
        com.fasterxml.jackson.core    jackson-annotations    2.7.8
        com.fasterxml.jackson.core    jackson-databind    2.7.8
            com.fasterxml.jackson.core    jackson-annotations    2.7.8
            com.fasterxml.jackson.core    jackson-core    2.8.8
        com.squareup.okhttp    okhttp    2.7.5
            com.squareup.okio    okio    1.6.0
    org.apache.hadoop    hadoop-mapreduce-client-core    3.1.1
        com.fasterxml.jackson.core    jackson-databind    2.7.8
            com.fasterxml.jackson.core    jackson-annotations    2.7.8
            com.fasterxml.jackson.core    jackson-core    2.8.8
        com.google.protobuf    protobuf-java    2.5.0
        org.apache.hadoop    hadoop-hdfs-client    3.1.1
            com.fasterxml.jackson.core    jackson-annotations    2.7.8
            com.fasterxml.jackson.core    jackson-databind    2.7.8
                com.fasterxml.jackson.core    jackson-annotations    2.7.8
                com.fasterxml.jackson.core    jackson-core    2.8.8
            com.squareup.okhttp    okhttp    2.7.5
                com.squareup.okio    okio    1.6.0
        org.apache.hadoop    hadoop-yarn-client    3.1.1
            com.google.guava    guava    16.0.1
            commons-cli    commons-cli    1.2
            commons-lang    commons-lang    2.6
            commons-logging    commons-logging    1.2
            org.apache.hadoop    hadoop-yarn-api    3.1.1
                com.fasterxml.jackson.core    jackson-annotations    2.7.8
                com.google.guava    guava    16.0.1
                com.google.protobuf    protobuf-java    2.5.0
                commons-lang    commons-lang    2.6
                commons-logging    commons-logging    1.2
                javax.xml.bind    jaxb-api    2.2.11
            org.apache.hadoop    hadoop-yarn-common    3.1.1
                com.fasterxml.jackson.core    jackson-core    2.8.8
                com.fasterxml.jackson.core    jackson-databind    2.7.8
                    com.fasterxml.jackson.core    jackson-annotations    2.7.8
                    com.fasterxml.jackson.core    jackson-core    2.8.8
                com.fasterxml.jackson.jaxrs    jackson-jaxrs-json-provider    2.7.8
                    com.fasterxml.jackson.core    jackson-core    2.8.8
                    com.fasterxml.jackson.core    jackson-databind    2.7.8
                        com.fasterxml.jackson.core    jackson-annotations    2.7.8
                        com.fasterxml.jackson.core    jackson-core    2.8.8
                    com.fasterxml.jackson.jaxrs    jackson-jaxrs-base    2.7.8
                        com.fasterxml.jackson.core    jackson-core    2.8.8
                        com.fasterxml.jackson.core    jackson-databind    2.7.8
                            com.fasterxml.jackson.core    jackson-annotations    2.7.8
                            com.fasterxml.jackson.core    jackson-core    2.8.8
                    com.fasterxml.jackson.module    jackson-module-jaxb-annotations    2.7.8
                        com.fasterxml.jackson.core    jackson-annotations    2.7.8
                        com.fasterxml.jackson.core    jackson-core    2.8.8
                        com.fasterxml.jackson.core    jackson-databind    2.7.8
                            com.fasterxml.jackson.core    jackson-annotations    2.7.8
                            com.fasterxml.jackson.core    jackson-core    2.8.8
                com.fasterxml.jackson.module    jackson-module-jaxb-annotations    2.7.8
                    com.fasterxml.jackson.core    jackson-annotations    2.7.8
                    com.fasterxml.jackson.core    jackson-core    2.8.8
                    com.fasterxml.jackson.core    jackson-databind    2.7.8
                        com.fasterxml.jackson.core    jackson-annotations    2.7.8
                        com.fasterxml.jackson.core    jackson-core    2.8.8
                com.google.guava    guava    16.0.1
                com.google.inject    guice    4.0
                    aopalliance    aopalliance    1.0
                    com.google.guava    guava    16.0.1
                    javax.inject    javax.inject    1
                com.google.protobuf    protobuf-java    2.5.0
                com.sun.jersey.contribs    jersey-guice    1.19
                    com.google.inject    guice    4.0
                        aopalliance    aopalliance    1.0
                        com.google.guava    guava    16.0.1
                        javax.inject    javax.inject    1
                    com.sun.jersey    jersey-servlet    1.19
                        com.sun.jersey    jersey-server    1.19
                            com.sun.jersey    jersey-core    1.19
                                javax.ws.rs    jsr311-api    1.1.1
                    javax.inject    javax.inject    1
                com.sun.jersey    jersey-client    1.19
                    com.sun.jersey    jersey-core    1.19
                        javax.ws.rs    jsr311-api    1.1.1
                com.sun.jersey    jersey-core    1.19
                    javax.ws.rs    jsr311-api    1.1.1
                com.sun.jersey    jersey-json    1.19
                    com.sun.jersey    jersey-core    1.19
                        javax.ws.rs    jsr311-api    1.1.1
                    com.sun.xml.bind    jaxb-impl    2.2.3-1
                        javax.xml.bind    jaxb-api    2.2.11
                    org.codehaus.jackson    jackson-core-asl    1.9.13
                    org.codehaus.jackson    jackson-jaxrs    1.9.2
                        org.codehaus.jackson    jackson-core-asl    1.9.13
                        org.codehaus.jackson    jackson-mapper-asl    1.9.13
                            org.codehaus.jackson    jackson-core-asl    1.9.13
                    org.codehaus.jackson    jackson-mapper-asl    1.9.13
                        org.codehaus.jackson    jackson-core-asl    1.9.13
                    org.codehaus.jackson    jackson-xc    1.9.2
                        org.codehaus.jackson    jackson-core-asl    1.9.13
                        org.codehaus.jackson    jackson-mapper-asl    1.9.13
                            org.codehaus.jackson    jackson-core-asl    1.9.13
                    org.codehaus.jettison    jettison    1.1
                com.sun.jersey    jersey-server    1.19
                    com.sun.jersey    jersey-core    1.19
                        javax.ws.rs    jsr311-api    1.1.1
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                                    org.codehaus.jackson    jackson-core-asl    1.9.13
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                                org.codehaus.jackson    jackson-core-asl    1.9.13
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            com.sun.jersey    jersey-client    1.19
                com.sun.jersey    jersey-core    1.19
                    javax.ws.rs    jsr311-api    1.1.1
            com.sun.jersey    jersey-core    1.19
                javax.ws.rs    jsr311-api    1.1.1
            com.sun.jersey    jersey-json    1.19
                com.sun.jersey    jersey-core    1.19
                    javax.ws.rs    jsr311-api    1.1.1
                com.sun.xml.bind    jaxb-impl    2.2.3-1
                    javax.xml.bind    jaxb-api    2.2.11
                org.codehaus.jackson    jackson-core-asl    1.9.13
                org.codehaus.jackson    jackson-jaxrs    1.9.2
                    org.codehaus.jackson    jackson-core-asl    1.9.13
                    org.codehaus.jackson    jackson-mapper-asl    1.9.13
                        org.codehaus.jackson    jackson-core-asl    1.9.13
                org.codehaus.jackson    jackson-mapper-asl    1.9.13
                    org.codehaus.jackson    jackson-core-asl    1.9.13
                org.codehaus.jackson    jackson-xc    1.9.2
                    org.codehaus.jackson    jackson-core-asl    1.9.13
                    org.codehaus.jackson    jackson-mapper-asl    1.9.13
                        org.codehaus.jackson    jackson-core-asl    1.9.13
                org.codehaus.jettison    jettison    1.1
            com.sun.jersey    jersey-server    1.19
                com.sun.jersey    jersey-core    1.19
                    javax.ws.rs    jsr311-api    1.1.1
            commons-cli    commons-cli    1.2
            commons-codec    commons-codec    1.11
            commons-io    commons-io    2.5
            commons-lang    commons-lang    2.6
            commons-logging    commons-logging    1.2
            javax.servlet    javax.servlet-api    3.1.0
            javax.xml.bind    jaxb-api    2.2.11
            org.apache.commons    commons-compress    1.4.1
                org.tukaani    xz    1.0
            org.apache.hadoop    hadoop-auth    3.1.1
                com.google.guava    guava    16.0.1
                com.nimbusds    nimbus-jose-jwt    4.41.1
                    com.github.stephenc.jcip    jcip-annotations    1.0-1
                    net.minidev    json-smart    2.3
                        net.minidev    accessors-smart    1.2
                            org.ow2.asm    asm    5.0.4
                commons-codec    commons-codec    1.11
                net.minidev    json-smart    2.3
                    net.minidev    accessors-smart    1.2
                        org.ow2.asm    asm    5.0.4
                org.apache.curator    curator-framework    2.12.0
                    org.apache.curator    curator-client    2.12.0
                        com.google.guava    guava    16.0.1
                        org.apache.zookeeper    zookeeper    3.4.9
                            jline    jline    0.9.94
                            org.slf4j    slf4j-api    1.7.29
                        org.slf4j    slf4j-api    1.7.29
                org.apache.httpcomponents    httpclient    4.5.2
                    commons-codec    commons-codec    1.11
                    commons-logging    commons-logging    1.2
                    org.apache.httpcomponents    httpcore    4.4.4
                org.apache.kerby    kerb-simplekdc    1.0.1
                    org.apache.kerby    kerb-admin    1.0.1
                        org.apache.kerby    kerb-server    1.0.1
                            org.apache.kerby    kerb-common    1.0.1
                                commons-io    commons-io    2.5
                                org.apache.kerby    kerb-crypto    1.0.1
                                    org.apache.kerby    kerb-core    1.0.1
                                        org.apache.kerby    kerby-pkix    1.0.1
                                            org.apache.kerby    kerby-asn1    1.0.1
                                            org.apache.kerby    kerby-util    1.0.1
                                            org.slf4j    slf4j-api    1.7.29
                                    org.apache.kerby    kerby-util    1.0.1
                                org.apache.kerby    kerby-config    1.0.1
                                    org.slf4j    slf4j-api    1.7.29
                            org.apache.kerby    kerb-identity    1.0.1
                                org.apache.kerby    kerb-core    1.0.1
                                    org.apache.kerby    kerby-pkix    1.0.1
                                        org.apache.kerby    kerby-asn1    1.0.1
                                        org.apache.kerby    kerby-util    1.0.1
                                        org.slf4j    slf4j-api    1.7.29
                                org.apache.kerby    kerby-config    1.0.1
                                    org.slf4j    slf4j-api    1.7.29
                        org.apache.kerby    kerb-util    1.0.1
                            org.apache.kerby    kerb-core    1.0.1
                                org.apache.kerby    kerby-pkix    1.0.1
                                    org.apache.kerby    kerby-asn1    1.0.1
                                    org.apache.kerby    kerby-util    1.0.1
                                    org.slf4j    slf4j-api    1.7.29
                            org.apache.kerby    kerb-crypto    1.0.1
                                org.apache.kerby    kerb-core    1.0.1
                                    org.apache.kerby    kerby-pkix    1.0.1
                                        org.apache.kerby    kerby-asn1    1.0.1
                                        org.apache.kerby    kerby-util    1.0.1
                                        org.slf4j    slf4j-api    1.7.29
                                org.apache.kerby    kerby-util    1.0.1
                            org.apache.kerby    kerby-config    1.0.1
                                org.slf4j    slf4j-api    1.7.29
                        org.apache.kerby    kerby-xdr    1.0.1
                    org.apache.kerby    kerb-client    1.0.1
                        org.apache.kerby    kerb-common    1.0.1
                            commons-io    commons-io    2.5
                            org.apache.kerby    kerb-crypto    1.0.1
                                org.apache.kerby    kerb-core    1.0.1
                                    org.apache.kerby    kerby-pkix    1.0.1
                                        org.apache.kerby    kerby-asn1    1.0.1
                                        org.apache.kerby    kerby-util    1.0.1
                                        org.slf4j    slf4j-api    1.7.29
                                org.apache.kerby    kerby-util    1.0.1
                            org.apache.kerby    kerby-config    1.0.1
                                org.slf4j    slf4j-api    1.7.29
                        org.apache.kerby    kerb-core    1.0.1
                            org.apache.kerby    kerby-pkix    1.0.1
                                org.apache.kerby    kerby-asn1    1.0.1
                                org.apache.kerby    kerby-util    1.0.1
                                org.slf4j    slf4j-api    1.7.29
                        org.apache.kerby    kerb-util    1.0.1
                            org.apache.kerby    kerb-core    1.0.1
                                org.apache.kerby    kerby-pkix    1.0.1
                                    org.apache.kerby    kerby-asn1    1.0.1
                                    org.apache.kerby    kerby-util    1.0.1
                                    org.slf4j    slf4j-api    1.7.29
                            org.apache.kerby    kerb-crypto    1.0.1
                                org.apache.kerby    kerb-core    1.0.1
                                    org.apache.kerby    kerby-pkix    1.0.1
                                        org.apache.kerby    kerby-asn1    1.0.1
                                        org.apache.kerby    kerby-util    1.0.1
                                        org.slf4j    slf4j-api    1.7.29
                                org.apache.kerby    kerby-util    1.0.1
                            org.apache.kerby    kerby-config    1.0.1
                                org.slf4j    slf4j-api    1.7.29
                        org.apache.kerby    kerby-config    1.0.1
                            org.slf4j    slf4j-api    1.7.29
                        org.apache.kerby    token-provider    1.0.1
                            com.nimbusds    nimbus-jose-jwt    4.41.1
                                com.github.stephenc.jcip    jcip-annotations    1.0-1
                                net.minidev    json-smart    2.3
                                    net.minidev    accessors-smart    1.2
                                        org.ow2.asm    asm    5.0.4
                            org.apache.kerby    kerb-core    1.0.1
                                org.apache.kerby    kerby-pkix    1.0.1
                                    org.apache.kerby    kerby-asn1    1.0.1
                                    org.apache.kerby    kerby-util    1.0.1
                                    org.slf4j    slf4j-api    1.7.29
                org.apache.zookeeper    zookeeper    3.4.9
                    jline    jline    0.9.94
                    org.slf4j    slf4j-api    1.7.29
                org.slf4j    slf4j-api    1.7.29
            org.apache.hadoop    hadoop-yarn-api    3.1.1
                com.fasterxml.jackson.core    jackson-annotations    2.7.8
                com.google.guava    guava    16.0.1
                com.google.protobuf    protobuf-java    2.5.0
                commons-lang    commons-lang    2.6
                commons-logging    commons-logging    1.2
                javax.xml.bind    jaxb-api    2.2.11
            org.eclipse.jetty    jetty-util    9.3.19.v20170502
            org.slf4j    slf4j-api    1.7.29
org.scala-lang    scala-library    2.12.10
org.typelevel    cats-core_2.12    2.0.0
    org.typelevel    cats-kernel_2.12    2.0.0
    org.typelevel    cats-macros_2.12    2.0.0

Specifying a Hadoop Version

By default, HDFS connector uses Hadoop 3.1.1. If you are using a different version of Hadoop, you should exclude the Hadoop libraries from the connector dependency and add the dependency for your preferred version.

Set up client

Flows provided by this connector need a prepared org.apache.hadoop.fs.FileSystem to interact with HDFS.

Scala
import org.apache.hadoop.conf.Configuration
import org.apache.hadoop.fs.FileSystem

val conf = new Configuration()
conf.set("fs.default.name", "hdfs://localhost:54310")

val fs: FileSystem = FileSystem.get(conf)
Java
Configuration conf = new Configuration();
conf.set("fs.default.name", "hdfs://localhost:54310");

fs = FileSystem.get(conf);

Writing

The connector provides three Flows. Each flow requires RotationStrategy and SyncStrategy to run. HdfsFlow. HdfsFlow.

The flows push OutgoingMessage to a downstream.

Data Writer

Use HdfsFlow.data to stream with FSDataOutputStream without any compression.

Scala
val flow = HdfsFlow.data(
  fs,
  SyncStrategy.count(500),
  RotationStrategy.size(1, FileUnit.GB),
  HdfsWritingSettings()
)
Java
Flow<HdfsWriteMessage<ByteString, NotUsed>, RotationMessage, NotUsed> flow =
    HdfsFlow.data(
        fs, SyncStrategy.count(500), RotationStrategy.size(1, FileUnit.GB()), settings);

Compressed Data Writer

First, create CompressionCodec.

Scala
val codec = new DefaultCodec()
codec.setConf(fs.getConf)
Java
DefaultCodec codec = new DefaultCodec();
codec.setConf(fs.getConf());

Then, use HdfsFlow.compress to stream with CompressionOutputStream and CompressionCodec.

Scala
val flow = HdfsFlow.compressed(
  fs,
  SyncStrategy.count(1),
  RotationStrategy.size(0.1, FileUnit.MB),
  codec,
  settings
)
Java
Flow<HdfsWriteMessage<ByteString, NotUsed>, RotationMessage, NotUsed> flow =
    HdfsFlow.compressed(
        fs, SyncStrategy.count(50), RotationStrategy.size(0.1, FileUnit.MB()), codec, settings);

Sequence Writer

Use HdfsFlow.sequence to stream a flat file consisting of binary key/value pairs.

Without Compression

Scala
val flow = HdfsFlow.sequence(
  fs,
  SyncStrategy.none,
  RotationStrategy.size(1, FileUnit.MB),
  settings,
  classOf[Text],
  classOf[Text]
)
Java
Flow<HdfsWriteMessage<Pair<Text, Text>, NotUsed>, RotationMessage, NotUsed> flow =
    HdfsFlow.sequence(
        fs,
        SyncStrategy.none(),
        RotationStrategy.size(1, FileUnit.MB()),
        SequenceFile.CompressionType.BLOCK,
        codec,
        settings,
        Text.class,
        Text.class);

With Compression

First, define a codec.

Scala
val codec = new DefaultCodec()
codec.setConf(fs.getConf)
Java
DefaultCodec codec = new DefaultCodec();
codec.setConf(fs.getConf());

Then, create a flow.

Scala
val flow = HdfsFlow.sequence(
  fs,
  SyncStrategy.none,
  RotationStrategy.size(1, FileUnit.MB),
  CompressionType.BLOCK,
  codec,
  settings,
  classOf[Text],
  classOf[Text]
)
Java
Flow<HdfsWriteMessage<Pair<Text, Text>, NotUsed>, RotationMessage, NotUsed> flow =
    HdfsFlow.sequence(
        fs,
        SyncStrategy.none(),
        RotationStrategy.size(1, FileUnit.MB()),
        settings,
        Text.class,
        Text.class);

Passing data through HdfsFlow

Use HdfsFlow.dataWithPassThrough, HdfsFlow.compressedWithPassThrough or HdfsFlow.sequenceWithPassThrough.

When streaming documents from Kafka, you might want to commit to Kafka. The flow will emit two messages. For every input, it will produce WrittenMessage and when it rotates, RotationMessage.

Let’s say that we have these classes.

Scala
case class Book(title: String)
case class KafkaOffset(offset: Int)
case class KafkaMessage(book: Book, offset: KafkaOffset)
Java
public static class Book {
  final String title;

  Book(String title) {
    this.title = title;
  }
}

static class KafkaCommitter {
  List<Integer> committedOffsets = new ArrayList<>();

  void commit(KafkaOffset offset) {
    committedOffsets.add(offset.offset);
  }
}

static class KafkaOffset {
  final int offset;

  KafkaOffset(int offset) {
    this.offset = offset;
  }
}

static class KafkaMessage {
  final Book book;
  final KafkaOffset offset;

  KafkaMessage(Book book, KafkaOffset offset) {
    this.book = book;
    this.offset = offset;
  }
}

Then, we can stream with passThrough.

Scala
// We're going to pretend we got messages from kafka.
// After we've written them to HDFS, we want
// to commit the offset to Kafka
val messagesFromKafka = List(
  KafkaMessage(Book("Akka Concurrency"), KafkaOffset(0)),
  KafkaMessage(Book("Akka in Action"), KafkaOffset(1)),
  KafkaMessage(Book("Effective Akka"), KafkaOffset(2)),
  KafkaMessage(Book("Learning Scala"), KafkaOffset(3)),
  KafkaMessage(Book("Scala Puzzlers"), KafkaOffset(4)),
  KafkaMessage(Book("Scala for Spark in Production"), KafkaOffset(5))
)

var committedOffsets = List[KafkaOffset]()

def commitToKafka(offset: KafkaOffset): Unit =
  committedOffsets = committedOffsets :+ offset

val resF = Source(messagesFromKafka)
  .map { kafkaMessage: KafkaMessage =>
    val book = kafkaMessage.book
    // Transform message so that we can write to hdfs
    HdfsWriteMessage(ByteString(book.title), kafkaMessage.offset)
  }
  .via(
    HdfsFlow.dataWithPassThrough[KafkaOffset](
      fs,
      SyncStrategy.count(50),
      RotationStrategy.count(4),
      HdfsWritingSettings().withNewLine(true)
    )
  )
  .map { message =>
    message match {
      case WrittenMessage(passThrough, _) =>
        commitToKafka(passThrough)
      case _ => ()
    }
    message
  }
  .collect {
    case rm: RotationMessage => rm
  }
  .runWith(Sink.seq)
Java
// We're going to pretend we got messages from kafka.
// After we've written them to HDFS, we want
// to commit the offset to Kafka
List<KafkaMessage> messagesFromKafka =
    Arrays.asList(
        new KafkaMessage(new Book("Akka Concurrency"), new KafkaOffset(0)),
        new KafkaMessage(new Book("Akka in Action"), new KafkaOffset(1)),
        new KafkaMessage(new Book("Effective Akka"), new KafkaOffset(2)),
        new KafkaMessage(new Book("Learning Scala"), new KafkaOffset(3)),
        new KafkaMessage(new Book("Scala Puzzlers"), new KafkaOffset(4)),
        new KafkaMessage(new Book("Scala for Spark in Production"), new KafkaOffset(5)));

final KafkaCommitter kafkaCommitter = new KafkaCommitter();

Flow<HdfsWriteMessage<ByteString, KafkaOffset>, OutgoingMessage<KafkaOffset>, NotUsed> flow =
    HdfsFlow.dataWithPassThrough(
        fs,
        SyncStrategy.count(50),
        RotationStrategy.count(4),
        HdfsWritingSettings.create().withNewLine(true));

CompletionStage<List<RotationMessage>> resF =
    Source.from(messagesFromKafka)
        .map(
            kafkaMessage -> {
              Book book = kafkaMessage.book;
              // Transform message so that we can write to hdfs\
              return HdfsWriteMessage.create(
                  ByteString.fromString(book.title), kafkaMessage.offset);
            })
        .via(flow)
        .map(
            message -> {
              if (message instanceof WrittenMessage) {
                kafkaCommitter.commit(((WrittenMessage<KafkaOffset>) message).passThrough());
                return message;
              } else {
                return message;
              }
            })
        .collectType(RotationMessage.class) // Collect only rotation messages
        .runWith(Sink.seq(), materializer);

Configuration

We can configure the sink by HdfsWritingSettings.

Scala
val settings =
  HdfsWritingSettings()
    .withOverwrite(true)
    .withNewLine(false)
    .withLineSeparator(System.getProperty("line.separator"))
    .withPathGenerator(pathGenerator)
Java
HdfsWritingSettings.create()
    .withOverwrite(true)
    .withNewLine(false)
    .withLineSeparator(System.getProperty("line.separator"))
    .withPathGenerator(pathGenerator);

File path generator

FilePathGenerator provides a functionality to generate rotation path in HDFS.

Scala
val pathGenerator =
  FilePathGenerator(
    (rotationCount: Long, timestamp: Long) => s"/tmp/alpakka/$rotationCount-$timestamp"
  )
Java
BiFunction<Long, Long, String> func =
    (rotationCount, timestamp) -> "/tmp/alpakka/" + rotationCount + "-" + timestamp;
FilePathGenerator pathGenerator = FilePathGenerator.create(func);

Rotation Strategy

RotationStrategy provides a functionality to decide when to rotate files.

Sync Strategy

SyncStrategy provides a functionality to decide when to synchronize the output.

Reading

Use HdfsSource to read from HDFS. HdfsSource. HdfsSource.

Data Reader

Scala
val source = HdfsSource.data(fs, path)
Java
Source<ByteString, CompletionStage<IOResult>> source = HdfsSource.data(fs, path);

Compressed Data Reader

Scala
val source = HdfsSource.compressed(fs, path, codec)
Java
Source<ByteString, CompletionStage<IOResult>> source = HdfsSource.compressed(fs, path, codec);

Sequence Reader

Scala
val source = HdfsSource.sequence(fs, path, classOf[Text], classOf[Text])
Java
Source<Pair<Text, Text>, NotUsed> source =
    HdfsSource.sequence(fs, path, Text.class, Text.class);

Running the example code

The code in this guide is part of runnable tests of this project. You are welcome to edit the code and run it in sbt.

Scala
sbt
> hdfs/testOnly *.HdfsWriterSpec
> hdfs/testOnly *.HdfsReaderSpec
Java
sbt
> hdfs/testOnly *.HdfsWriterTest
> hdfs/testOnly *.HdfsReaderTest
Found an error in this documentation? The source code for this page can be found here. Please feel free to edit and contribute a pull request.