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Posted to yarn-issues@hadoop.apache.org by "Karthik Kambatla (JIRA)" <ji...@apache.org> on 2014/07/03 07:35:56 UTC
[jira] [Updated] (YARN-1902) Allocation of too many containers when
a second request is done with the same resource capability
[ https://issues.apache.org/jira/browse/YARN-1902?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Karthik Kambatla updated YARN-1902:
-----------------------------------
Target Version/s: 2.6.0 (was: 2.5.0)
> Allocation of too many containers when a second request is done with the same resource capability
> -------------------------------------------------------------------------------------------------
>
> Key: YARN-1902
> URL: https://issues.apache.org/jira/browse/YARN-1902
> Project: Hadoop YARN
> Issue Type: Bug
> Components: client
> Affects Versions: 2.2.0, 2.3.0, 2.4.0
> Reporter: Sietse T. Au
> Labels: client
> Attachments: YARN-1902.patch, YARN-1902.v2.patch, YARN-1902.v3.patch
>
>
> Regarding AMRMClientImpl
> Scenario 1:
> Given a ContainerRequest x with Resource y, when addContainerRequest is called z times with x, allocate is called and at least one of the z allocated containers is started, then if another addContainerRequest call is done and subsequently an allocate call to the RM, (z+1) containers will be allocated, where 1 container is expected.
> Scenario 2:
> No containers are started between the allocate calls.
> Analyzing debug logs of the AMRMClientImpl, I have found that indeed a (z+1) are requested in both scenarios, but that only in the second scenario, the correct behavior is observed.
> Looking at the implementation I have found that this (z+1) request is caused by the structure of the remoteRequestsTable. The consequence of Map<Resource, ResourceRequestInfo> is that ResourceRequestInfo does not hold any information about whether a request has been sent to the RM yet or not.
> There are workarounds for this, such as releasing the excess containers received.
> The solution implemented is to initialize a new ResourceRequest in ResourceRequestInfo when a request has been successfully sent to the RM.
> The patch includes a test in which scenario one is tested.
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