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Posted to hdfs-dev@hadoop.apache.org by "Colin Patrick McCabe (JIRA)" <ji...@apache.org> on 2014/11/03 19:03:34 UTC

[jira] [Created] (HDFS-7325) Prevent thundering herd problem in ByteArrayManager by using notify not notifyAll

Colin Patrick McCabe created HDFS-7325:
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             Summary: Prevent thundering herd problem in ByteArrayManager by using notify not notifyAll
                 Key: HDFS-7325
                 URL: https://issues.apache.org/jira/browse/HDFS-7325
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Colin Patrick McCabe


Currently ByteArrayManager wakes all waiting threads whenever a byte array is released and count == limit.  However, only one thread can proceed.    With a large number of waiters, this will cause a thundering herd problem.  (See http://en.wikipedia.org/wiki/Thundering_herd_problem.)  We should avoid this by only waking a single thread.



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