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From "Keith Turner (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-427) Data lost when tablets moving around frequently
Date Mon, 27 Feb 2012 19:02:46 GMT
Data lost when tablets moving around frequently
-----------------------------------------------

                 Key: ACCUMULO-427
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-427
             Project: Accumulo
          Issue Type: Bug
          Components: tserver
         Environment: 10 node cluster running random walk test w/ agitation
            Reporter: Keith Turner
            Assignee: Keith Turner
            Priority: Blocker
             Fix For: 1.4.0


The shard random walk test failed when verifiy its new index.  This test has two tables a
document table and a sharded index table used to find documents.  The test has a node that
rebuilds the index from the document table and then verifies that the new and old index are
the same.  This verification failed.  The failure was all realted to data loss in one tablet
in the new index table.  The data that was lost was read from two tablets in the document
table.  None of the lost data appeared in any write ahead logs.  The tablet that last data
was being moved around very frequently during the time of the data loss.  All of the evidence
points to a bug in the batch writer or the tablet server code related to writing data.

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