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Posted to yarn-issues@hadoop.apache.org by "Wangda Tan (JIRA)" <ji...@apache.org> on 2016/09/02 00:28:22 UTC
[jira] [Commented] (YARN-4948) Support node labels store in
zookeeper
[ https://issues.apache.org/jira/browse/YARN-4948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15457059#comment-15457059 ]
Wangda Tan commented on YARN-4948:
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Sorry for the late response, I just discussed with [~subru], and talked to [~naganarasimha_gr@apache.org] few months before.
Thanks for taking up this JIRA, [~wjlei], I would suggest:
- If you want it works with WASB file system (or other file system doesn't support append), you can try to use NonAppendableFSNodeLabelStore.
- If you don't want YARN fails because of HDFS failures, you can setup yarn.node-labels.fs-store.retry-policy-spec
- Reasonable number of nodes and reasonable frequency of node label updating is already supported by existing stores. There will be a lot of issue if #nodemanager goes beyond 20000+, for example, scheduler itself becomes a bottleneck.
I would say adding the new ZK store impl will add extra overhead to code maintenance. And since pluggable node label store is supported, if you really want to run a ZK store, you can configure it in yarn-site.xml. So I suggest to keep this open until this becomes a common requirement for node label.
> Support node labels store in zookeeper
> --------------------------------------
>
> Key: YARN-4948
> URL: https://issues.apache.org/jira/browse/YARN-4948
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: resourcemanager
> Reporter: jialei weng
> Assignee: jialei weng
> Attachments: YARN-4948.001.patch, YARN-4948.002.patch, YARN-4948.003.patch, YARN-4948.006.patch, YARN-4948.007.patch
>
>
> Support node labels store in zookeeper. The main scenario for this is to give a way to decouple yarn with HDFS. Since nodelabel is a very important data for yarn, if hdfs down, yarn will fail to start up,too. So it is meaningful for make yarn much independence when user serve both yarn and HDFS.
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