[jira] [Created] (HDFS-4397) Combined diff may not be identical to the diffs applied sequentially

[Tsz Wo (Nicholas), SZE (JIRA)]

Tsz Wo (Nicholas), SZE created HDFS-4397:
--------------------------------------------

             Summary: Combined diff may not be identical to the diffs applied 
sequentially
                 Key: HDFS-4397
                 URL: https://issues.apache.org/jira/browse/HDFS-4397
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: namenode
            Reporter: Tsz Wo (Nicholas), SZE
            Assignee: Tsz Wo (Nicholas), SZE


Let diffs
{noformat}
d(1,k)   = m_1 + m_2 + ... + m_k;
d(k+1,n) = m_{k+1} + m_{k+2} + ... + m_n;
{noformat}
and
{noformat}
d(1,n)   = m_1 + m_2 + ... + m_n,
{noformat}
where m_j denote modifications.  Then, we may have
{noformat}
d(1,k) + d(k+1,n) != d(1,n).
{noformat}


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