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From "Jeongdae Kim (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-15832) memory leak in FSHLog.
Date Mon, 16 May 2016 04:55:12 GMT
Jeongdae Kim created HBASE-15832:

             Summary: memory leak in FSHLog.
                 Key: HBASE-15832
                 URL: https://issues.apache.org/jira/browse/HBASE-15832
             Project: HBase
          Issue Type: Bug
          Components: hbase
    Affects Versions: 1.1.2
            Reporter: Jeongdae Kim

FSHLog module uses a map to reuse SyncFuture objects, and assumes that this map will be used
by RPC Handler threads only. but, in some cases, this assumption is wrong. 
for example, if some coprocessors are registered, and these coprocessors uses CoprocessorHConnection
insteadof HConnection, and request some puts/ or deletes throgh CoprocessorHConnection, all
mutations will be handled by hconnection's batchPool, not RPC Handlers. because hconnection's
batchPool is dynamically growing or shrinking, all new threads in hconnection are put to the
map in FSHLog, and this map will grow continuously.

in attached image file, the map to reuse SyncFuture accupies about 4GB memory and has (almost
all) entries holding hconnection's thread.

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