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From "Eric Newton (JIRA)" <>
Subject [jira] [Created] (ACCUMULO-733) add description of the BatchWriter behavior
Date Sat, 18 Aug 2012 17:05:37 GMT
Eric Newton created ACCUMULO-733:

             Summary: add description of the BatchWriter behavior
                 Key: ACCUMULO-733
             Project: Accumulo
          Issue Type: Bug
          Components: docs
            Reporter: Eric Newton
            Assignee: Eric Newton
            Priority: Trivial

Keith Turner wrote up a nice description of the BatchWriter on the gora mailing list. I think
it deserves to be in the BatchWriter documentation:

When the user creates a
BatchWriter to write to Accumulo they specify how much memory and how
many threads it should use.  As the user adds mutations to the batch
writer it buffers them.  Once the buffered mutations have used half of
the user specified, the mutations are dumped into the background to be
written by a thread pool.  If the user specified memory completely
fills up, then writes are held.  When a user calls flush, it does not
return until all buffered mutations are written.

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