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From "Hooman Peiro Sajjad (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3848) A Bug in recoverLeaseInternal method of FSNameSystem class
Date Thu, 23 Aug 2012 16:44:42 GMT
Hooman Peiro Sajjad created HDFS-3848:

             Summary: A Bug in recoverLeaseInternal method of FSNameSystem class
                 Key: HDFS-3848
                 URL: https://issues.apache.org/jira/browse/HDFS-3848
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: name-node
    Affects Versions: 0.23.1
            Reporter: Hooman Peiro Sajjad

This is a bug in logic of the method recoverLeaseInternal. In line 1322 it checks if the owner
of the file is trying to recreate the file. The condition of the if statement is 

(leaseFile != null && leaseFile.equals(lease)) || lease.getHolder().equals(holder)

As it can be seen, there are two operands (conditions) connected with an "or" operator. The
first operand is straight and will be true only if the holder of the file is the new holder.
But the problem is the second operand which will be always true since the "lease" object is
the one found by the "holder" by calling "Lease lease = leaseManager.getLease(holder);" in
line 1315.

To fix this I think the if statement only should contain the following the condition:
(leaseFile != null && leaseFile.getHolder().equals(holder))

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