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https://issues.apache.org/jira/browse/YARN-6483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16263778#comment-16263778
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Arun Suresh commented on YARN-6483:
-----------------------------------
Actually - closing this for now. The branch-2 version might need more work.
Will re-open once we decide if we really need it for 2.9.x or 2.10
> Add nodes transitioning to DECOMMISSIONING state to the list of updated nodes
> returned to the AM
> ------------------------------------------------------------------------------------------------
>
> Key: YARN-6483
> URL: https://issues.apache.org/jira/browse/YARN-6483
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: resourcemanager
> Reporter: Juan Rodríguez Hortalá
> Assignee: Juan Rodríguez Hortalá
> Attachments: YARN-6483-v1.patch, YARN-6483.002.patch,
> YARN-6483.003.patch
>
>
> The DECOMMISSIONING node state is currently used as part of the graceful
> decommissioning mechanism to give time for tasks to complete in a node that
> is scheduled for decommission, and for reducer tasks to read the shuffle
> blocks in that node. Also, YARN effectively blacklists nodes in
> DECOMMISSIONING state by assigning them a capacity of 0, to prevent
> additional containers to be launched in those nodes, so no more shuffle
> blocks are written to the node. This blacklisting is not effective for
> applications like Spark, because a Spark executor running in a YARN container
> will keep receiving more tasks after the corresponding node has been
> blacklisted at the YARN level. We would like to propose a modification of the
> YARN heartbeat mechanism so nodes transitioning to DECOMMISSIONING are added
> to the list of updated nodes returned by the Resource Manager as a response
> to the Application Master heartbeat. This way a Spark application master
> would be able to blacklist a DECOMMISSIONING at the Spark level.
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