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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4951) Lease monitor does not own the LeaseManager lock in changing leases.
Date Tue, 30 Dec 2008 19:19:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12659899#action_12659899
] 

Tsz Wo (Nicholas), SZE commented on HADOOP-4951:
------------------------------------------------

> And what is the effect of this bug?

The LeaseManager lock is used to protect the lease related data structures.  So the bug leads
to a race condition on the leases.

> Lease monitor does not own the LeaseManager lock in changing leases.
> --------------------------------------------------------------------
>
>                 Key: HADOOP-4951
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4951
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.18.2
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>            Priority: Blocker
>             Fix For: 0.18.3
>
>         Attachments: 4951_20081229.patch, 4951_20081229b.patch, 4951_20081229c.patch,
4951_20081229c_0.18.patch, 4951_20081229c_0.19.patch
>
>
> In Monitor.checkLeases(), the monitor thread does not own the LeaseManager lock but it
may modify the leases.

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