HBase
  1. HBase
  2. HBASE-5930

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

    Details

    • Type: Improvement Improvement
    • Status: Closed
    • Priority: Major 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.

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

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            People

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

              Dates

              • Created:
                Updated:
                Resolved:

                Development