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From "Josh Elser (JIRA)" <>
Subject [jira] [Created] (ACCUMULO-1645) Provide better information on unassigned tablets on the monitor
Date Wed, 07 Aug 2013 14:12:48 GMT
Josh Elser created ACCUMULO-1645:

             Summary: Provide better information on unassigned tablets on the monitor
                 Key: ACCUMULO-1645
             Project: Accumulo
          Issue Type: Improvement
          Components: monitor
    Affects Versions: 1.4.3
            Reporter: Josh Elser
             Fix For: 1.4.4

Take the situation when live ingest occurs on a system. During live ingest, many tablet servers
die, due to unexpected issues (data-center issues, for example). When the tablets are reassigned
to a new tabletserver, if all copies of the necessary WAL files for that tablet were contained
on servers which are now dead, the tablet cannot be assigned until those files can be found.

This presents itself on the monitor as unassigned tablets, but doesn't denote any additional
information about which table they belong to, the extent, or even that this is due to missing
WAL files. It would be nice to definitively know which tablets are offline, the WAL files
which are missing, and any additional information Accumulo might have. This would alleviate
the administrator of the system from having to guess as to why said tablets are offline.

Due to the HDFS WAL support in 1.5, this is even less of a concern than it is in 1.4 due to
the decreased likelihood of a WAL file going missing.

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