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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-119) logSync() may block NameNode forever.
Date Mon, 27 Jul 2009 22:38:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12735819#action_12735819
] 

Suresh Srinivas commented on HDFS-119:
--------------------------------------

While running junit tests, the following tests fail, which are unrelated to this patch:
org.apache.hadoop.hdfs.TestDFSShell
org.apache.hadoop.hdfs.TestHDFSServerPorts
org.apache.hadoop.hdfs.server.namenode.TestStartup
 

> 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
>         Attachments: 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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