[jira] [Updated] (STORM-872) Expose interfaces to give users opportunity to customize "executor" heartbeat module

["Rick Kellogg (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/STORM-872?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rick Kellogg updated STORM-872:
-------------------------------
    Component/s: storm-core

> Expose interfaces to give users opportunity to customize "executor" heartbeat module
> ------------------------------------------------------------------------------------
>
>                 Key: STORM-872
>                 URL: https://issues.apache.org/jira/browse/STORM-872
>             Project: Apache Storm
>          Issue Type: Improvement
>          Components: storm-core
>            Reporter: Jungtaek Lim
>
> I have seen questions, papers and slides addressing heartbeat timeout, and most of these point out ZK is the reason.
> - Storm@Twitter, SIGMOD 2014 : http://db.cs.berkeley.edu/cs286/papers/storm-sigmod2014.pdf
> - Scaling Storm, Hadoop Summit 2015 : http://www.slideshare.net/RobertEvans26/scaling-apache-storm-hadoop-summit-2015
> - and so on.
> ZK has a hard limit of throughput and reading / writing disk is the matter.
> Throughput would be far more better when we're dealing worker heartbeat with in-memory storage directly, or heartbeat daemon which can scale well.
> (Trade-off could be made.)
> If we can open the interface of worker heartbeat module, and give users opportunities to customize it, it would be really great.
> - Why I'm narrowing heartbeat to "worker" only?
> -- I was thinking "supervisor" heartbeat too, but it uses ephemeral node of ZK, which is normally not supported to other storage. 
> -- And in Scaling Storm, p15, about 99.2% of ZK workload is worker heartbeats. I think ZK can take care of supervisor heartbeat without problem.
> --- default of "supervisor.heartbeat.frequency.secs" is 5
> --- default of "task.heartbeat.frequency.secs" is 3
> -- I didn't think about "worker to supervisor" heartbeat cause it uses local file system.



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