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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4186) logSync() is called with the write lock held while releasing lease
Date Wed, 14 Nov 2012 16:10:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13497183#comment-13497183
] 

Kihwal Lee commented on HDFS-4186:
----------------------------------

These tests started failing since last night. I am guessing HDFS-4171.
https://builds.apache.org/view/Hadoop/job/Hadoop-Hdfs-trunk/1226/

                
> 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
>         Attachments: hdfs-4186-trunk.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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