[jira] [Created] (HDFS-6527) Edit log corruption due to defered INode removal

["Kihwal Lee (JIRA)" <ji...@apache.org>]

Kihwal Lee created HDFS-6527:
--------------------------------

             Summary: Edit log corruption due to defered INode removal
                 Key: HDFS-6527
                 URL: https://issues.apache.org/jira/browse/HDFS-6527
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 2.4.0
            Reporter: Kihwal Lee
            Priority: Blocker


We have seen a SBN crashing with the following error:
{panel}
\[Edit log tailer\] ERROR namenode.FSEditLogLoader:
Encountered exception on operation AddBlockOp
[path=/xxx,
penultimateBlock=NULL, lastBlock=blk_111_111, RpcClientId=,
RpcCallId=-2]
java.io.FileNotFoundException: File does not exist: /xxx
{panel}

This was caused by the deferred removal of deleted inodes from the inode map. Since startFile() acquires FSN read lock and then write lock, a deletion can happen in between. Because of deferred inode removal outside FSN write lock, startFile() can get the deleted inode from the inode map with FSN write lock held. This allow addition of a block to a deleted file.

As a result, the edit log will contain OP_ADD, OP_DELETE, followed by
 OP_ADD_BLOCK.  This cannot be replayed by NN, so NN doesn't start up or SBN crashes.




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