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From "sam liu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4527) For shortening the time of TaskTracker heartbeat, decouple the statics collection operations
Date Sun, 24 Feb 2013 04:50:12 GMT
sam liu created HDFS-4527:
-----------------------------

             Summary: For shortening the time of TaskTracker heartbeat, decouple the statics
collection operations
                 Key: HDFS-4527
                 URL: https://issues.apache.org/jira/browse/HDFS-4527
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: performance
    Affects Versions: 1.1.1
            Reporter: sam liu


In each heartbeat of TaskTracker, it will calculate some system statics, like the free disk
space, available virtual/physical memory, cpu usage, etc. However, it's not necessary to calculate
all the statics in every heartbeat, and this will consume many system resource and impace
the performance of TaskTracker heartbeat. Furthermore, the characteristics of system properties(disk,
memory, cpu) are different and it's better to collect their statics in different intervals.

To reduce the latency of TaskTracker heartbeat, one solution is to decouple all the system
statics collection operations from it, and issue separate threads to do the statics collection
works when the TaskTracker starts. The threads could be three: the first one is to collect
cpu related statics in a short interval; the second one is to collect memory related statics
in a normal interval; the third one is to collect disk related statics in a long interval.
And all the interval could be customized by the parameter "mapred.stats.collection.interval"
in the mapred-site.xml. At last, the heartbeat could get values of system statics from the
memory directly.

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