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  1. HBase
  2. HBASE-5930

Limits the amount of time an edit can live in the memstore.

    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 0.98.0, 0.94.8, 0.95.1
    • Component/s: None
    • Labels:
      None
    • Hadoop Flags:
      Reviewed
    • Release Note:
      Hide
      This feature limits the time that unflushed data will stay in the memstore.
      By default a memstore will flush if data older than 1h (3600000ms) is present.

      This can be configured via hbase.regionserver.optionalcacheflushinterval (default value is 3600000).
      Show
      This feature limits the time that unflushed data will stay in the memstore. By default a memstore will flush if data older than 1h (3600000ms) is present. This can be configured via hbase.regionserver.optionalcacheflushinterval (default value is 3600000).

      Description

      A colleague of mine ran into an interesting issue.
      He inserted some data with the WAL disabled, which happened to fit in the aggregate Memstores memory.

      Two weeks later he a had problem with the HDFS cluster, which caused the region servers to abort. He found that his data was lost. Looking at the log we found that the Memstores were not flushed at all during these two weeks.

      Should we have an option to flush memstores periodically. There are obvious downsides to this, like many small storefiles, etc.

        Attachments

        1. hbase-5930-test-execution.log
          18 kB
          Enis Soztutar
        2. hbase-5930-addendum2.patch
          0.7 kB
          Enis Soztutar
        3. HBASE-5930-ADD-0.patch
          2 kB
          Elliott Clark
        4. 5930-wip.patch
          10 kB
          Devaraj Das
        5. 5930-track-oldest-sample.txt
          14 kB
          Lars Hofhansl
        6. 5930-addendum-for-disabling.trunk.with-tests.txt
          7 kB
          Devaraj Das
        7. 5930-addendum-for-disabling.trunk.with-tests.txt
          7 kB
          Devaraj Das
        8. 5930-addendum-for-disabling.trunk.txt
          1 kB
          Devaraj Das
        9. 5930-2.4.patch
          17 kB
          Devaraj Das
        10. 5930-2.3.patch
          17 kB
          Devaraj Das
        11. 5930-2.2.patch
          13 kB
          Devaraj Das
        12. 5930-2.1.patch
          13 kB
          Devaraj Das
        13. 5930-1.patch
          10 kB
          Devaraj Das
        14. 5930-0.94-added-addendum-with-tests.txt
          20 kB
          Devaraj Das
        15. 5930-0.94-added-addendum.txt
          15 kB
          Devaraj Das
        16. 5930-0.94-2.txt
          15 kB
          Devaraj Das
        17. 5930-0.94.txt
          14 kB
          Lars Hofhansl

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              • Assignee:
                devaraj Devaraj Das
                Reporter:
                lhofhansl Lars Hofhansl
              • Votes:
                1 Vote for this issue
                Watchers:
                23 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved: