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From "Konstantin Shvachko (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-119) logSync() may block NameNode forever.
Date Sat, 07 Apr 2012 01:25:19 GMT

     [ https://issues.apache.org/jira/browse/HDFS-119?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Konstantin Shvachko updated HDFS-119:
-------------------------------------

    Attachment: HDFS-119-branch-1.0.patch

Here is the patch for branch-1.0
                
> logSync() may block NameNode forever.
> -------------------------------------
>
>                 Key: HDFS-119
>                 URL: https://issues.apache.org/jira/browse/HDFS-119
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Konstantin Shvachko
>            Assignee: Suresh Srinivas
>             Fix For: 0.21.0
>
>         Attachments: HDFS-119-branch-1.0.patch, HDFS-119.patch, HDFS-119.patch
>
>
> # {{FSEditLog.logSync()}} first waits until {{isSyncRunning}} is false and then performs
syncing to file streams by calling {{EditLogOutputStream.flush()}}.
> If an exception is thrown after {{isSyncRunning}} is set to {{true}} all threads will
always wait on this condition.
> An {{IOException}} may be thrown by {{EditLogOutputStream.setReadyToFlush()}} or a {{RuntimeException}}
may be thrown by {{EditLogOutputStream.flush()}} or by {{processIOError()}}.
> # The loop that calls {{eStream.flush()}} for multiple {{EditLogOutputStream}}-s is not
synchronized, which means that another thread may encounter an error and modify {{editStreams}}
by say calling {{processIOError()}}. Then the iterating process in {{logSync()}} will break
with {{IndexOutOfBoundException}}.

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