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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-7266) HDFS Peercache enabled check should not lock on object
Date Mon, 20 Oct 2014 14:11:33 GMT
Gopal V created HDFS-7266:
-----------------------------

             Summary: HDFS Peercache enabled check should not lock on object
                 Key: HDFS-7266
                 URL: https://issues.apache.org/jira/browse/HDFS-7266
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs-client
    Affects Versions: 2.6.0
            Reporter: Gopal V
         Attachments: dfs-open-10-threads.png

HDFS fs.Open synchronizes on the Peercache, even when peer cache is disabled.

{code}
 public synchronized Peer get(DatanodeID dnId, boolean isDomain) {

    if (capacity <= 0) { // disabled
      return null;
    }
{code}

since capacity is a final, this could be moved outside the lock.

!dfs-open-10-threads.png!



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