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From "Mike Drob (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-1645) Provide better information on unassigned tablets on the monitor
Date Mon, 03 Mar 2014 16:35:25 GMT


Mike Drob commented on ACCUMULO-1645:

Any objections to this getting bumped off of 1.4.5?

> Provide better information on unassigned tablets on the monitor
> ---------------------------------------------------------------
>                 Key: ACCUMULO-1645
>                 URL:
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: monitor
>    Affects Versions: 1.4.3
>            Reporter: Josh Elser
>             Fix For: 1.4.5
> 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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