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From "patrick white (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3771) Namenode can't restart due to corrupt edit logs, timing issue with shutdown and edit log rolling
Date Tue, 07 Aug 2012 16:36:10 GMT
patrick white created HDFS-3771:

             Summary: Namenode can't restart due to corrupt edit logs, timing issue with shutdown
and edit log rolling
                 Key: HDFS-3771
                 URL: https://issues.apache.org/jira/browse/HDFS-3771
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: name-node
    Affects Versions: 0.23.3
         Environment: QE, 20 node Federated cluster with 3 NNs and 15 DNs, using Kerberos
based security
            Reporter: patrick white
            Priority: Critical

Our 0.23.3 nightly HDFS regression suite encountered a particularly nasty issue recently,
which resulted in the cluster's default Namenode being unable to restart, this was on a 20
node Federated cluster with security. The cause appears to be that the NN was just starting
to roll its edit log when a shutdown occurred, the shutdown was intentional to restart the
cluster as part of an automated test.

The tests that were running do not appear to be the issue in themselves, the cluster was just
wrapping up an adminReport subset and this failure case has not reproduce so far, nor was
it failing previously. It looks like a chance occurrence of sending the shutdown just as the
edit log roll was begun.

>From the NN log, the following sequence is noted:

1. an InvalidateBlocks operation had completed
2. FSNamesystem: Roll Edit Log from [Secondary Namenode IPaddr]
3. FSEditLog: Ending log segment 23963
4. FSEditLog: Starting log segment at 23967
=> the NN shuts down and then is restarted...
5. FSImageTransactionalStorageInspector: Logs beginning at txid 23967 were are all in-progress
6. FSImageTransactionalStorageInspector: Marking log at /grid/[PATH]/edits_inprogress_0000000000000023967
as corrupt since it has no transactions in it.
7. NameNode: Exception in namenode join [main]java.lang.IllegalStateException: No non-corrupt
logs for txid 23967
=> NN start attempts continue to cycle trying to restart but can't, failing on the same
exception due to lack of non-corrupt edit logs

If observations are correct and issue is from shutdown happening as edit logs are rolling,
does the NN have an equivalent to the conventional fs 'sync' blocking action that should be
called, or perhaps has a timing hole?

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