[
https://issues.apache.org/jira/browse/YARN-6483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16279006#comment-16279006
]
Robert Kanter commented on YARN-6483:
-------------------------------------
YARN-7162 is the one that actually removes the XML parsing code. There's more
details on YARN-7162, but in a nutshell, we didn't want to get locked into
supporting this exact XML formatting for the excludes file, because it could
change once YARN-5536 is completed, which aims to add a JSON format, and make
the format pluggable. Not shipping the current XML format in 3.0 allows us to
do that.
> 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
> Fix For: 3.1.0
>
> 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.
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
---------------------------------------------------------------------
To unsubscribe, e-mail: yarn-issues-unsubscr...@hadoop.apache.org
For additional commands, e-mail: yarn-issues-h...@hadoop.apache.org
