HBase
  1. HBase
  2. HBASE-6856

Document the LeaseException thrown in scanner next

    Details

    • Type: Improvement Improvement
    • Status: Closed
    • Priority: Major Major
    • Resolution: Fixed
    • Affects Version/s: 0.92.0
    • Fix Version/s: 0.95.0
    • Component/s: documentation
    • Labels:
    • Hadoop Flags:
      Reviewed

      Description

      In some situations clients that fetch data from a RS get a LeaseException instead of the usual ScannerTimeoutException/UnknownScannerException.

      This particular case should be documented in the HBase guide.

      Some key points

      • the source of exception is: org.apache.hadoop.hbase.regionserver.Leases.removeLease(Leases.java:230)
      • it happens in the context of a slow/freezing RS#next
      • it can be prevented by having hbase.rpc.timeout > hbase.regionserver.lease.period

      Harsh J investigated the issue and has some conclusions, see

      http://mail-archives.apache.org/mod_mbox/hbase-user/201209.mbox/%3CCAOcnVr3R-LqtKhFsk8Bhrm-YW2i9O6J6Fhjz2h7q6_sxvwd2yw%40mail.gmail.com%3E

        Activity

        Hide
        stack added a comment -

        Committed. Let me push the book up to the site after this commit. Thanks for the mailing list distillation (and thanks Harsh for digging in on this one...)

        Show
        stack added a comment - Committed. Let me push the book up to the site after this commit. Thanks for the mailing list distillation (and thanks Harsh for digging in on this one...)
        Hide
        stack added a comment -

        I meant to say thanks Daniel for distilling the mailing list thread and making this issue.

        Show
        stack added a comment - I meant to say thanks Daniel for distilling the mailing list thread and making this issue.
        Hide
        Hudson added a comment -

        Integrated in HBase-TRUNK #3366 (See https://builds.apache.org/job/HBase-TRUNK/3366/)
        HBASE-6856 Document the LeaseException thrown in scanner next (Revision 1388604)

        Result = FAILURE
        stack :
        Files :

        • /hbase/trunk/src/docbkx/troubleshooting.xml
        Show
        Hudson added a comment - Integrated in HBase-TRUNK #3366 (See https://builds.apache.org/job/HBase-TRUNK/3366/ ) HBASE-6856 Document the LeaseException thrown in scanner next (Revision 1388604) Result = FAILURE stack : Files : /hbase/trunk/src/docbkx/troubleshooting.xml
        Hide
        Hudson added a comment -

        Integrated in HBase-TRUNK-on-Hadoop-2.0.0 #186 (See https://builds.apache.org/job/HBase-TRUNK-on-Hadoop-2.0.0/186/)
        HBASE-6856 Document the LeaseException thrown in scanner next (Revision 1388604)

        Result = FAILURE
        stack :
        Files :

        • /hbase/trunk/src/docbkx/troubleshooting.xml
        Show
        Hudson added a comment - Integrated in HBase-TRUNK-on-Hadoop-2.0.0 #186 (See https://builds.apache.org/job/HBase-TRUNK-on-Hadoop-2.0.0/186/ ) HBASE-6856 Document the LeaseException thrown in scanner next (Revision 1388604) Result = FAILURE stack : Files : /hbase/trunk/src/docbkx/troubleshooting.xml
        Hide
        stack added a comment -

        Marking closed.

        Show
        stack added a comment - Marking closed.

          People

          • Assignee:
            Daniel Iancu
            Reporter:
            Daniel Iancu
          • Votes:
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            Watchers:
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            Dates

            • Created:
              Updated:
              Resolved:

              Development