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Posted to hdfs-issues@hadoop.apache.org by "Ted Yu (JIRA)" <ji...@apache.org> on 2014/12/08 23:31:13 UTC

[jira] [Created] (HDFS-7495) Lock inversion in DFSInputStream#getBlockAt()

Ted Yu created HDFS-7495:
----------------------------

             Summary: Lock inversion in DFSInputStream#getBlockAt()
                 Key: HDFS-7495
                 URL: https://issues.apache.org/jira/browse/HDFS-7495
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Ted Yu
            Priority: Minor


There're two locks: one on DFSInputStream.this , one on DFSInputStream.infoLock
Normally lock is obtained on infoLock, then on DFSInputStream.infoLock

However, such order is not observed in DFSInputStream#getBlockAt() :
{code}
    synchronized(infoLock) {
...
      if (updatePosition) {
        // synchronized not strictly needed, since we only get here
        // from synchronized caller methods
        synchronized(this) {
{code}



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