[jira] [Commented] (HBASE-7386) Investigate providing some supervisor support for znode deletion

["Shengzhe Yao (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-7386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14005054#comment-14005054 ] 

Shengzhe Yao commented on HBASE-7386:
-------------------------------------

Any updates ? Are we going to merge the latest patch ? This is a pretty cool feature and please let me know if there are things I can help :) 

> Investigate providing some supervisor support for znode deletion
> ----------------------------------------------------------------
>
>                 Key: HBASE-7386
>                 URL: https://issues.apache.org/jira/browse/HBASE-7386
>             Project: HBase
>          Issue Type: Task
>          Components: master, regionserver, scripts
>            Reporter: Gregory Chanan
>            Assignee: stack
>            Priority: Blocker
>         Attachments: HBASE-7386-bin-v2.patch, HBASE-7386-bin-v3.patch, HBASE-7386-bin.patch, HBASE-7386-conf-v2.patch, HBASE-7386-conf-v3.patch, HBASE-7386-conf.patch, HBASE-7386-src.patch, HBASE-7386-v0.patch, supervisordconfigs-v0.patch
>
>
> There a couple of JIRAs for deleting the znode on a process failure:
> HBASE-5844 (RS)
> HBASE-5926 (Master)
> which are pretty neat; on process failure, they delete the znode of the underlying process so HBase can recover faster.
> These JIRAs were implemented via the startup scripts; i.e. the script hangs around and waits for the process to exit, then deletes the znode.
> There are a few problems associated with this approach, as listed in the below JIRAs:
> 1) Hides startup output in script
> https://issues.apache.org/jira/browse/HBASE-5844?focusedCommentId=13463401&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13463401
> 2) two hbase processes listed per launched daemon
> https://issues.apache.org/jira/browse/HBASE-5844?focusedCommentId=13463409&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13463409
> 3) Not run by a real supervisor
> https://issues.apache.org/jira/browse/HBASE-5844?focusedCommentId=13463409&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13463409
> 4) Weird output after kill -9 actual process in standalone mode
> https://issues.apache.org/jira/browse/HBASE-5926?focusedCommentId=13506801&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13506801
> 5) Can kill existing RS if called again
> https://issues.apache.org/jira/browse/HBASE-5844?focusedCommentId=13463401&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13463401
> 6) Hides stdout/stderr[6]
> https://issues.apache.org/jira/browse/HBASE-5844?focusedCommentId=13506832&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13506832
> I suspect running in via something like supervisor.d can solve these issues if we provide the right support.



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