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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-1637) Update HDFS append/sync precondition check for Hadoop 1.2
Date Sun, 04 Aug 2013 02:53:48 GMT
Josh Elser created ACCUMULO-1637:
------------------------------------

             Summary: Update HDFS append/sync precondition check for Hadoop 1.2
                 Key: ACCUMULO-1637
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1637
             Project: Accumulo
          Issue Type: Bug
          Components: tserver
    Affects Versions: 1.5.0
            Reporter: Josh Elser
            Priority: Critical
             Fix For: 1.5.1


Apache Hadoop 1.2.0 ships with the durable sync enabled by default and the support append
option marked as obsolete. Because of this, the check inside of TabletServer, meant to ensure
that the HDFS WAL can function properly, incorrectly fails as it doesn't know that dfs.durable.sync
is on by default.

This can be worked around by specifying the old durable sync property in hdfs-site.xml:

{noformat}
<property>
  <name>dfs.durable.sync</name>
  <value>true</value>
</property>
{noformat}

I'm not sure how to best way to address the differences between the newer and older versions
of Hadoop and their differing append support.

Thanks to Carlos Mundi for pointing this out on user@a.a.o

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