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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-412) FifoScheduler incorrectly checking for node locality
Date Sun, 31 Mar 2013 19:11:15 GMT

     [ https://issues.apache.org/jira/browse/YARN-412?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Arun C Murthy updated YARN-412:
-------------------------------

    Assignee: Roger Hoover  (was: Arun C Murthy)
    
> FifoScheduler incorrectly checking for node locality
> ----------------------------------------------------
>
>                 Key: YARN-412
>                 URL: https://issues.apache.org/jira/browse/YARN-412
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: scheduler
>            Reporter: Roger Hoover
>            Assignee: Roger Hoover
>            Priority: Minor
>              Labels: patch
>         Attachments: YARN-412.patch, YARN-412.patch, YARN-412.patch
>
>
> In the FifoScheduler, the assignNodeLocalContainers method is checking if the data is
local to a node by searching for the nodeAddress of the node in the set of outstanding requests
for the app.  This seems to be incorrect as it should be checking hostname instead.  The offending
line of code is 455:
> application.getResourceRequest(priority, node.getRMNode().getNodeAddress());
> Requests are formated by hostname (e.g. host1.foo.com) whereas node addresses are a concatenation
of hostname and command port (e.g. host1.foo.com:1234)
> In the CapacityScheduler, it's done using hostname.  See LeafQueue.assignNodeLocalContainers,
line 1129
> application.getResourceRequest(priority, node.getHostName());
> Note that this bug does not affect the actual scheduling decisions made by the FifoScheduler
because even though it incorrect determines that a request is not local to the node, it will
still schedule the request immediately because it's rack-local.  However, this bug may be
adversely affecting the reporting of job status by underreporting the number of tasks that
were node local.

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