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From "Rakesh R (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3382) BookKeeperJournalManager: NN startup is failing, when tries to recoverUnfinalizedSegments() a bad inProgress_ ZNodes
Date Tue, 08 May 2012 07:04:45 GMT
Rakesh R created HDFS-3382:
------------------------------

             Summary: BookKeeperJournalManager: NN startup is failing, when tries to recoverUnfinalizedSegments()
a bad inProgress_ ZNodes
                 Key: HDFS-3382
                 URL: https://issues.apache.org/jira/browse/HDFS-3382
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Rakesh R
             Fix For: 0.24.0


Say, the InProgress_000X node is corrupted due to not writing the data(version, ledgerId,
firstTxId) to this inProgress_000X znode. Namenode startup has the logic to recover all the
unfinalized segments, here will try to read the segment and getting shutdown.

{noformat}
EditLogLedgerMetadata.java:

static EditLogLedgerMetadata read(ZooKeeper zkc, String path)
      throws IOException, KeeperException.NoNodeException  {
      byte[] data = zkc.getData(path, false, null);
      String[] parts = new String(data).split(";");
      if (parts.length == 3)
         ....reading inprogress metadata
      else if (parts.length == 4)
         ....reading inprogress metadata
      else
        throw new IOException("Invalid ledger entry, "
                              + new String(data));
      }
{noformat}


Scenario:- Leaving bad inProgress_000X node ?
Assume BKJM has created the inProgress_000X zNode and ZK is not available when trying to add
the metadata. Now, inProgress_000X ends up with partial information.


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