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https://issues.apache.org/jira/browse/HBASE-14674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14972417#comment-14972417
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Heng Chen commented on HBASE-14674:
-----------------------------------
IMO Failed {{org.apache.hadoop.hbase.snapshot.TestMobExportSnapshot}} has no
relates with this issue.
But if necessary, i will dig it.
> Rpc handler / task monitoring seems to be broken after 0.98
> -----------------------------------------------------------
>
> Key: HBASE-14674
> URL: https://issues.apache.org/jira/browse/HBASE-14674
> Project: HBase
> Issue Type: Bug
> Reporter: Enis Soztutar
> Fix For: 1.3.0, 1.2.1, 1.0.3, 1.1.4, 0.98.17
>
> Attachments: HBASE-14674.patch, HBASE-14674_v1.patch,
> HBASE-14674_v2.patch
>
>
> In 0.96, we have the RPC handlers listed as tasks and show them in the web UI
> as well:
> {code}
> Tasks:
> ===========================================================
> Task: RpcServer.handler=0,port=64231
> Status: WAITING:Waiting for a call
> Running for 932s
> Task: RpcServer.handler=1,port=64231
> Status: WAITING:Waiting for a call
> Running for 932s
> Task: RpcServer.handler=2,port=64231
> Status: WAITING:Waiting for a call
> Running for 932s
> {code}
> After pluggable RPC scheduler, the way the tasks work for the handlers got
> changed. We no longer list idle RPC handlers in the tasks, but we register
> them dynamically to {{TaskMonitor}} through {{CallRunner}}. However, the IPC
> readers are still registered the old way (meaning that idle readers are
> listed as tasks, but not idle handlers).
> From the javadoc of {{MonitoredRPCHandlerImpl}}, it seems that we are NOT
> optimizing the allocation for the MonitoredTask anymore, but instead allocate
> one for every RPC call breaking the pattern (See CallRunner.getStatus()).
> {code}
> /**
> * A MonitoredTask implementation designed for use with RPC Handlers
> * handling frequent, short duration tasks. String concatenations and object
> * allocations are avoided in methods that will be hit by every RPC call.
> */
> @InterfaceAudience.Private
> public class MonitoredRPCHandlerImpl extends MonitoredTaskImpl
> {code}
> There is also one more side affect that, since the CallRunner is a per-RPC
> object and created in the RPC listener thread, the created task ends up
> having a name "listener" although the actual processing happens in a handler
> thread. This is obviously very confusing during debugging.
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