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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-15154) Master puts up a blockcache instance
Date Thu, 21 Jan 2016 22:02:39 GMT
stack created HBASE-15154:
-----------------------------

             Summary: Master puts up a blockcache instance
                 Key: HBASE-15154
                 URL: https://issues.apache.org/jira/browse/HBASE-15154
             Project: HBase
          Issue Type: Bug
            Reporter: stack
            Priority: Critical


Master is putting up a blockcache instance. It shouldn't. This issue comes of the unification
of Master and RegionServer where Master is a subclass of RegionServer. Our [~jmspaggi] found
out the hard way today when he tried to bring up a cluster with a large offheap cache only
the master member had been given less memory.

Marking critical rather than blocker because there is a means of configuring your way out
of this little entanglement; set hbase.bucketcache.size to zero in  the master config only.

If you want to set direct memory for regionservers only and not on the master, you should
do the following:

Set HBASE_OFFHEAPSIZE=0G

... and then turn it on for RegionServers only:

HBASE_REGIONSERVER_OPTS="HBASE_REGIONSERVER_OPTS -XX:MaxDirectMemorySize=XXXG" where XXX is
size of the direct memory you want to allocate.



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