class EventsByTagMigration extends AnyRef
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- new EventsByTagMigration(systemProvider: ClassicActorSystemProvider, pluginConfigPath: String = "akka.persistence.cassandra")
- pluginConfigPath
The config namespace where the plugin is configured, default is
akka.persistence.cassandra
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- def addTagsColumn(): Future[Done]
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- def migratePidsToTagViews(pids: Seq[PersistenceId], periodicFlush: Int = 0, flushTimeout: Timeout = Timeout(30.seconds)): Future[Done]
Migrates the given persistenceIds from the
messagestable to the newtags_viewtable.Migrates the given persistenceIds from the
messagestable to the newtags_viewtable.tag_viewtable must exist before calling this and can be created manually or via [createTagsTable]This is useful if there there is a more efficient way of getting all the persistenceIds than [CassandraReadJournal.currentPersistenceIds] which does a distinct query on the
messagestable.This can also be used to do partial migrations e.g. test a persistenceId in production before migrating everything.
It is recommended you use this if the
messagestable is large.Events are batched with the given
periodicFlush. By default the value equals configuredevents-by-tag.max-message-batch-size.- pids
PersistenceIds to migrate
- returns
A Future that completes when the migration is complete
- def migrateToTagViews(periodicFlush: Int = 0, filter: (String) => Boolean = _ => true, flushTimeout: Timeout = Timeout(30.seconds)): Future[Done]
Migrates the entire
messagestable to the the newtag_viewstable.Migrates the entire
messagestable to the the newtag_viewstable.Before running this you must run the migration of the
all_persistence_idstable as described in https://doc.akka.io/libraries/akka-persistence-cassandra/current/migrations.html#all-persistenceIds-queryUses [CassandraReadJournal.currentPersistenceIds] to find all persistenceIds. Note that this is a very inefficient cassandra query so might timeout. If so the version of this method can be used where the persistenceIds are provided.
Persistence ids can be excluded (e.g. useful if you know certain persistenceIds don't use tags.
Events are batched with the given
periodicFlush. By default the value equals configuredevents-by-tag.max-message-batch-size.- returns
A Future that completes when the migration is complete.
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