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https://issues.apache.org/jira/browse/HADOOP-970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13066488#comment-13066488
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Harsh J commented on HADOOP-970:
--------------------------------
Dhruba,
Looking at the blocker linked to this ticket, is the problem still valid on
trunk or a maintained release today with Java 1.6 being the bare minimum
requirement?
> Reduce CPU usage of hadoop ipc package
> --------------------------------------
>
> Key: HADOOP-970
> URL: https://issues.apache.org/jira/browse/HADOOP-970
> Project: Hadoop Common
> Issue Type: Bug
> Components: ipc
> Reporter: dhruba borthakur
>
> There are a couple of optimizations that could be done to reduce CPU
> consumption.
> 1. The method Server.cleanupConnections() could be invoked less often.
> 2. The method Server.cleanupConnections() uses a List to manage all active
> connections and uses connectionList.get(i) to iterate. Locating the ith
> element essentially translates to traversing the list from the beginning to
> the ith position.
> 3. The current DFS heartbeattime is 3 seconds whereas
> ipc.client.connection.maxidletime is set to 1 second. The proposal is to
> change the default value of ipc.client.connection.maxidletime to something
> larger than the heartbeat interval. This also has to suit the heartbeat
> periodicity of map-reduce software.
> 4. Evaluate epoll() added in JDK 1.5.10 (this is a java cmd line option)
> http://java.sun.com/j2se/1.5.0/ReleaseNotes.html#150_10
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