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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4186) logSync() is called with the write lock held while releasing lease
Date Fri, 16 Nov 2012 13:22:22 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13498807#comment-13498807
] 

Hudson commented on HDFS-4186:
------------------------------

Integrated in Hadoop-Mapreduce-trunk #1259 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1259/])
    HDFS-4186. logSync() is called with the write lock held while releasing lease (Kihwal
Lee via daryn) (Revision 1409988)

     Result = FAILURE
daryn : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1409988
Files : 
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/LeaseManager.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestEditLog.java

                
> logSync() is called with the write lock held while releasing lease
> ------------------------------------------------------------------
>
>                 Key: HDFS-4186
>                 URL: https://issues.apache.org/jira/browse/HDFS-4186
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.23.4, 2.0.2-alpha
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>            Priority: Critical
>             Fix For: 3.0.0, 2.0.3-alpha, 0.23.5, 0.23.6
>
>         Attachments: hdfs-4186-branch-0.23-inaccurate-batched-sync-count.patch, hdfs-4186-trunk.patch,
hdfs-4186-trunk-skip-standbyException.patch
>
>
> As pointed out in HDFS-4138, when the lease monitor calls internalReleaseLease(), it
acquires the namespace write lock. Inside internalReleaseLease(), if a block recovery is needed,
the lease is reassigned to the namenode itself and this is logged & synced in logReassignLease().
> Since this is done while the write lock is held, log syncing is blocked. When a large
number of leases are expired and blocks are recovered, namenode can slow down.

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