Uploaded image for project: 'HBase'
  1. HBase
  2. HBASE-22784

OldWALs not cleared in a replication slave cluster (cyclic replication bw 2 clusters)

    XMLWordPrintableJSON

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Blocker
    • Resolution: Fixed
    • Affects Version/s: 1.4.9, 1.4.10
    • Fix Version/s: 1.5.0, 1.4.11
    • Component/s: regionserver, Replication
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      When a cluster is passive (receiving edits only via replication) in a cyclic replication setup of 2 clusters, OldWALs size keeps on growing. On analysing, we observed the following behaviour.

      1. New entry is added to WAL (Edit replicated from other cluster).
      2. ReplicationSourceWALReaderThread(RSWALRT) reads and applies the configured filters (due to cyclic replication setup, ClusterMarkingEntryFilter discards new entry from other cluster).
      3. Entry is null, RSWALRT neither updates the batch stats (WALEntryBatch.lastWalPosition) nor puts it in the entryBatchQueue.
      4. ReplicationSource thread is blocked in entryBachQueue.take().
      5. So ReplicationSource#updateLogPosition has never invoked and WAL file is never cleared from ReplicationQueue.
      6. Hence LogCleaner on the master, doesn't deletes the oldWAL files from hadoop.

      NOTE: When a new edit is added via hbase-client, ReplicationSource thread process and clears the oldWAL files from replication queues and hence master cleans up the WALs

      Please provide us a solution

       

        Attachments

        1. HBASE-22784.branch-1.004.patch
          10 kB
          Wellington Chevreuil
        2. HBASE-22784.branch-1.003.patch
          10 kB
          Wellington Chevreuil
        3. HBASE-22784.branch-1.002.patch
          7 kB
          Wellington Chevreuil
        4. HBASE-22784.branch-1.001.patch
          5 kB
          Wellington Chevreuil

          Issue Links

            Activity

              People

              • Assignee:
                wchevreuil Wellington Chevreuil
                Reporter:
                solvannan Solvannan R M
              • Votes:
                0 Vote for this issue
                Watchers:
                9 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved: