Keys Botzum created ACCUMULO-1493:
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Summary: documentation clarification regarding dependencies
Key: ACCUMULO-1493
URL: https://issues.apache.org/jira/browse/ACCUMULO-1493
Project: Accumulo
Issue Type: Bug
Components: docs
Affects Versions: 1.5.1
Environment: MapR 2.1.1
Reporter: Keys Botzum
Priority: Minor
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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