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From "Keith Turner (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-549) Create infrastructure that supports debugging.
Date Fri, 20 Apr 2012 21:13:33 GMT
Keith Turner created ACCUMULO-549:
-------------------------------------

             Summary: Create infrastructure that supports debugging.
                 Key: ACCUMULO-549
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-549
             Project: Accumulo
          Issue Type: New Feature
            Reporter: Keith Turner
             Fix For: 1.5.0


Before a release an extensive amount of testing is done that usually involves running test
like continuous ingest and random walk on a cluster for extended periods of time.  When bugs
are found by these test it can take a lot of time to track the issue down sometimes.  Inorder
to make tracking these issues down easier the write ahead logs are archived.  These walogs
archives make it possible to answer questions about a tablets history because everything ever
written to the metadata table is there.  It would be nice to always have this capability on
an accumulo system, and have it be easy to use.  Spelunking around in the write ahead logs
is not an easy task.  

It would be nice if accumulo could answer questions like the following. 
 
 * Where has a tablet been assigned
 * What compactions has a tablet done
 * What split or merge created a tablet

These questions can currently be answered with walogs and log4j logs, but its painful.

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