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From "Yi Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7045) Fix NameNode deadlock when opening file under /.reserved path
Date Fri, 12 Sep 2014 00:50:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14130950#comment-14130950
] 

Yi Liu commented on HDFS-7045:
------------------------------

Thanks [~andrew.wang] for review and committing.

> Fix NameNode deadlock when opening file under /.reserved path
> -------------------------------------------------------------
>
>                 Key: HDFS-7045
>                 URL: https://issues.apache.org/jira/browse/HDFS-7045
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>            Reporter: Yi Liu
>            Assignee: Yi Liu
>            Priority: Critical
>             Fix For: 2.6.0
>
>         Attachments: HDFS-7045.001.patch
>
>
> {{resolvePath}} could throw exception in following case, then deadlock.
> * open file under path {{/.reserved/raw}} using a non super user.
> * open file under path {{/.reserved/.inodes}}.
> {{FSNamesystem#getBlockLocationsUpdateTimes}}:
> {code}
> ...
>      if (isReadOp) { // first attempt is with readlock
>         checkOperation(OperationCategory.READ);
>         readLock();
>       }  else { // second attempt is with  write lock
>         checkOperation(OperationCategory.WRITE);
>         writeLock(); // writelock is needed to set accesstime
>       }
>       src = resolvePath(src, pathComponents);
>       try {
>         ...
>       } finally {
>         if (isReadOp) {
>           readUnlock();
>         } else {
>           writeUnlock();
>         }
>       }
> {code}



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