Jeongdae Kim created HBASE-15832:
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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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