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  1. Hadoop HDFS
  2. HDFS-3077 Quorum-based protocol for reading and writing edit logs
  3. HDFS-3906

QJM: quorum timeout on failover with large log segment

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    Details

    • Type: Sub-task
    • Status: Resolved
    • Priority: Critical
    • Resolution: Fixed
    • Affects Version/s: QuorumJournalManager (HDFS-3077)
    • Fix Version/s: QuorumJournalManager (HDFS-3077)
    • Component/s: None
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      In doing some stress tests, I ran into an issue with failover if the current edit log segment written by the old active is large. With a 327MB log segment containing 6.4M transactions, the JN took ~11 seconds to read and validate it during the recovery step. This was longer than the 10 second timeout for createNewEpoch, which caused the recovery to fail.

        Attachments

        1. hdfs-3906.txt
          24 kB
          Todd Lipcon

          Activity
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            People

            • Assignee:
              tlipcon Todd Lipcon
              Reporter:
              tlipcon Todd Lipcon

              Dates

              • Created:
                Updated:
                Resolved:

                Issue deployment