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From "Nicolas Spiegelberg (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-3975) NoServerForRegionException stalls write pipeline
Date Thu, 09 Jun 2011 23:00:59 GMT
NoServerForRegionException stalls write pipeline
------------------------------------------------

                 Key: HBASE-3975
                 URL: https://issues.apache.org/jira/browse/HBASE-3975
             Project: HBase
          Issue Type: Bug
          Components: client
    Affects Versions: 0.90.3, 0.89.20100924, 0.92.0
            Reporter: Nicolas Spiegelberg
            Assignee: Nicolas Spiegelberg


When we process a batch of puts, the current algorithm basically goes like this:

1. Find all servers for the Put requests
2. Partition Puts by servers
3. Make requests
4. Collect success/error results

If we throw an IOE in step 1 or 2, we will abort the whole batch operation.  In our case,
this was an NoServerForRegionException due to region rebalancing.  However, the asynchronous
put case normally has requests going to a wide variety of servers.  We should fail all the
put requests that throw an IOE in Step 1 but continue to try all the put requests that succeed
at this stage.

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