org.apache.hudi.org.apache.hadoop.hbase.replication.regionserver.CatalogReplicationSource Maven / Gradle / Ivy
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package org.apache.hadoop.hbase.replication.regionserver;
import java.util.Collections;
import org.apache.hadoop.hbase.wal.AbstractFSWALProvider;
import org.apache.yetus.audience.InterfaceAudience;
/**
* ReplicationSource that reads catalog WAL files -- e.g. hbase:meta WAL files -- and lets through
* all WALEdits from these WALs. This ReplicationSource is NOT created via
* {@link ReplicationSourceFactory}.
*/
@InterfaceAudience.Private
class CatalogReplicationSource extends ReplicationSource {
CatalogReplicationSource() {
// Filters in hbase:meta WAL files and allows all edits, including 'meta' edits (these are
// filtered out in the 'super' class default implementation).
super(p -> AbstractFSWALProvider.isMetaFile(p), Collections.emptyList());
}
@Override
public void logPositionAndCleanOldLogs(WALEntryBatch entryBatch) {
// Noop. This CatalogReplicationSource implementation does not persist state to backing storage
// nor does it keep its WALs in a general map up in ReplicationSourceManager --
// CatalogReplicationSource is used by the Catalog Read Replica feature which resets everytime
// the WAL source process crashes. Skip calling through to the default implementation.
// See "4.1 Skip maintaining zookeeper replication queue (offsets/WALs)" in the
// design doc attached to HBASE-18070 'Enable memstore replication for meta replica for detail'
// for background on why no need to keep WAL state.
}
}