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From "Jean-Daniel Cryans (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5190) Limit the IPC queue size based on calls' payload size
Date Thu, 22 Mar 2012 19:12:22 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13235909#comment-13235909
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Jean-Daniel Cryans commented on HBASE-5190:
-------------------------------------------

bq. 100MB is per RegionServer, right? Does seem a bit small. Maybe 1G?

Might be a good default, those with the default heap will definitely not get any help here
though.

bq. I take it that maybe this is something to consider for 0.96. Agreed?

The more I think about it, the more I want this in 0.94 because it can really give us a better
understanding of those issues we see on the mailing list.
                
> Limit the IPC queue size based on calls' payload size
> -----------------------------------------------------
>
>                 Key: HBASE-5190
>                 URL: https://issues.apache.org/jira/browse/HBASE-5190
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.90.5
>            Reporter: Jean-Daniel Cryans
>            Assignee: Jean-Daniel Cryans
>             Fix For: 0.94.0
>
>         Attachments: HBASE-5190.patch
>
>
> Currently we limit the number of calls in the IPC queue only on their count. It used
to be really high and was dropped down recently to num_handlers * 10 (so 100 by default) because
it was easy to OOME yourself when huge calls were being queued. It's still possible to hit
this problem if you use really big values and/or a lot of handlers, so the idea is that we
should take into account the payload size. I can see 3 solutions:
>  - Do the accounting outside of the queue itself for all calls coming in and out and
when a call doesn't fit, throw a retryable exception.
>  - Same accounting but instead block the call when it comes in until space is made available.
>  - Add a new parameter for the maximum size (in bytes) of a Call and then set the size
the IPC queue (in terms of the number of items) so that it could only contain as many items
as some predefined maximum size (in bytes) for the whole queue.

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