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From: "Josh Elser (JIRA)" <jira@apache.org>
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Subject: [jira] [Updated] (ACCUMULO-1493) documentation clarification for
 MapR
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     [ https://issues.apache.org/jira/browse/ACCUMULO-1493?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Josh Elser updated ACCUMULO-1493:
---------------------------------

    Fix Version/s:     (was: 1.5.1)
                       (was: 1.6.0)

> documentation clarification for MapR
> ------------------------------------
>
>                 Key: ACCUMULO-1493
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1493
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: docs
>    Affects Versions: 1.5.0
>         Environment: MapR 2.1.1
>            Reporter: Keys Botzum
>            Priority: Minor
>              Labels: Documentation
>
> When testing Accumulo with MapR we encountered a few minor issues that should be addressable via documentation. They are:
> 1)  Accumulo 1.5 requires these jar files:
>                  commons-configuration-1.6.jar
>                  commons-collections-3.2.1.jar
>                  commons-io-2.1.jar
> They are not part of the MapR distribution and do not appear to be part of the standard Hadoop distribution either. These dependencies should be documented.
> 2) MapR has the requirement that the block/chunk size be a multiple of 64K. As a result the default Accumulo algorithm for defining the WAL block size does not work with MapR. This should be documented. In more detail...
>      By default, the property tserver.wal.blocksize is 0, in which case Accumlo sets it to 1.1 * tserver.walog.max.size, which defaults to 512M. This results in a MapR chunksize that is not a multiple of 64k, which means any writes to the WAL will fail.  So in accumulo-site.xml, set tserver.wal.blocksize to a multiple of 64K (such as 562M, which is about 1.1 times  the WAL max.  Insert these lines:
>            <property>
>             <name>tserver.wal.blocksize</name>
>             <value>562M</value>
>            </property>
> 3) Need to document the Accumulo log sync mechanism for MapR. Accumulo 1.5 changed the way the WAL is sync'ed and now uses the distributed file system.    A filesystem-specific property is needed to specify the class for MapR. Add this to accumulo-site.xml:
>            <property>
>              <name>master.walog.closer.implementation</name>
>        <value>org.apache.accumulo.server.master.recovery.MapRLogCloser</value>
>            </property>



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