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From "Keith Turner (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-1962) Improve batch scanner throughput in failure case
Date Wed, 04 Dec 2013 15:57:37 GMT
Keith Turner created ACCUMULO-1962:
--------------------------------------

             Summary: Improve batch scanner throughput in failure case
                 Key: ACCUMULO-1962
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1962
             Project: Accumulo
          Issue Type: Improvement
            Reporter: Keith Turner
             Fix For: 1.7.0


The batch scanner currently does the following.

 # bin ranges to tablets servers and tabelts
 # if any ranges could not be binned (e.g. a  tablet had no location) goto 1
 # queue up work for tablet servers on a thread pool
 # wait for thread pool to complete all work
 # if there were any failures goto 1

In the face of failures (tablets not assigned because of migration, tablet servers dying)
it would be better if the batch scanner worked on what it could and immediately requeued failures
for processing immediately.   The ConditionalWriter and BatchWriter have failure queues and
increase the retry time if something keeps failing.




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