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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-4186) logSync() is called with the write lock held while releasing lease
Date Wed, 14 Nov 2012 13:24:13 GMT

     [ https://issues.apache.org/jira/browse/HDFS-4186?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kihwal Lee updated HDFS-4186:
-----------------------------

    Status: Patch Available  (was: Open)
    
> 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: 2.0.2-alpha, 0.23.4
>            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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