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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6728) [89-fb] prevent OOM possibility due to per connection responseQueue being unbounded
Date Tue, 23 Oct 2012 23:26:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6728?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13482821#comment-13482821

Lars Hofhansl commented on HBASE-6728:

That might be, but it will hang that RegionServer forever, no? An OOM would have been preferable
in that (it would cause an alert)

Unless that is explained (maybe I am misreading the patch) or addressed soon, I would prefer
backing this change out again.

> [89-fb] prevent OOM possibility due to per connection responseQueue being unbounded
> -----------------------------------------------------------------------------------
>                 Key: HBASE-6728
>                 URL: https://issues.apache.org/jira/browse/HBASE-6728
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Kannan Muthukkaruppan
>            Assignee: Michal Gregorczyk
>             Fix For: 0.94.3, 0.96.0
>         Attachments: 6728.94, 6728-trunk.txt
> The per connection responseQueue is an unbounded queue. The request handler threads today
try to send the response in line, but if things start to backup, the response is sent via
a per connection responder thread. This intermediate queue, because it has no bounds, can
be another source of OOMs.
> [Have not looked at this issue in trunk. So it may or may not be applicable there.]

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