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https://issues.apache.org/jira/browse/MAPREDUCE-5384?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Siddharth Seth updated MAPREDUCE-5384:
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Status: Open (was: Patch Available)
We should avoid any rpc operations (token renewal) inside of a synchronized
block. Currently it looks like a cancel operation could end up synchronizing on
such an operation which can take time.
> Races in DelegationTokenRenewal
> -------------------------------
>
> Key: MAPREDUCE-5384
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5384
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 1.1.2, 1.2.0, 1.2.1
> Reporter: Karthik Kambatla
> Assignee: Karthik Kambatla
> Attachments: mr-5384-0.patch, mr-5384-1.patch
>
>
> There are a couple of races in DelegationTokenRenewal.
> One of them was addressed by MAPREDUCE-4860, which introduced a deadlock
> while fixing this race. Opening a new JIRA per discussion in MAPREDUCE-5364,
> since MAPREDUCE-4860 is already shipped in a release.
> Races to fix:
> # TimerTask#cancel() disallows future invocations of run(), but doesn't abort
> an already scheduled/started run().
> # In the context of DelegationTokenRenewal, RenewalTimerTask#cancel() only
> cancels that TimerTask instance. However, it has no effect on any other
> TimerTasks created for that token.
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