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From "Josh Elser (JIRA)" <>
Subject [jira] [Resolved] (ACCUMULO-3957) Consider moving off getContentSummary in the monitor
Date Sat, 29 Aug 2015 21:02:45 GMT


Josh Elser resolved ACCUMULO-3957.
    Resolution: Fixed

Made a decision and just dropped the fix into 1.8 for now. We can consider the implications
of a backport as needed.

> Consider moving off getContentSummary in the monitor
> ----------------------------------------------------
>                 Key: ACCUMULO-3957
>                 URL:
>             Project: Accumulo
>          Issue Type: Bug
>          Components: monitor
>            Reporter: Josh Elser
>            Assignee: Josh Elser
>            Priority: Critical
>             Fix For: 1.8.0
>          Time Spent: 10m
>  Remaining Estimate: 0h
> Recently heard about an issue where a large Hadoop installation which had Accumulo running
was experiencing long pauses in the Namenode. Inspecting NN audit logs, it was found that
the user running Accumulo issues a {{getContentSummary("/")}} call just before the NN pauses
were experienced.
> In {{}}, we use this call to compute the total HDFS disk usage and
present a ratio of space that Accumulo uses relative to the total available space.
> It's still unclear why this was causing issues in this case (as this operation should
only be acquiring a read-lock in the namenode), it was recommended to me that Accumulo use
the JMX metrics for the NN instead of making this call.

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