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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-4411) HDFS block caches are not dynamically resized on configuration change.
Date Wed, 17 Aug 2016 16:58:20 GMT
Josh Elser created ACCUMULO-4411:
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             Summary: HDFS block caches are not dynamically resized on configuration change.
                 Key: ACCUMULO-4411
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4411
             Project: Accumulo
          Issue Type: Improvement
          Components: tserver
            Reporter: Josh Elser


I noticed that the graph for Data Block Cache was constantly at zero, despite me changing
the configuration and ensuring that it was enabled for the metadata table. Upon looking at
the configuration, I saw that I configured it to 256 (bytes) instead of 256MB. After using
the Accumulo shell to change the configuration, the cache was not immediately used. After
I restarted the tservers, then the cache was used.

We should try to find a way to dynamically resize the caches on the fly to avoid the need
of restarting all tabletservers.



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