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From "deepankar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15525) OutOfMemory could occur when using BoundedByteBufferPool during RPC bursts
Date Wed, 30 Mar 2016 05:26:25 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15217417#comment-15217417
] 

deepankar commented on HBASE-15525:
-----------------------------------

bq. Sure I will correct that.. One issue is that when we have curBuf with remaining size 100
and there is a need for 110 bytes for a cell. So we will not use remaining 100 bytes from
this buf but go to next BB. Will try to solve this also.. That will auto solve the one u found

Will that still has the same the just acquired buffer will stay empty so will the next buffer
as the buffers we are using are of fixed size ?

Side note also verified from sample internal production data, there were some outliers which
could trigger this (thought our data was clean enough).

> OutOfMemory could occur when using BoundedByteBufferPool during RPC bursts
> --------------------------------------------------------------------------
>
>                 Key: HBASE-15525
>                 URL: https://issues.apache.org/jira/browse/HBASE-15525
>             Project: HBase
>          Issue Type: Sub-task
>          Components: IPC/RPC
>            Reporter: deepankar
>            Assignee: Anoop Sam John
>            Priority: Critical
>         Attachments: WIP.patch
>
>
> After HBASE-13819 the system some times run out of direct memory whenever there is some
network congestion or some client side issues.
> This was because of pending RPCs in the RPCServer$Connection.responseQueue and since
all the responses in this queue hold a buffer for cellblock from BoundedByteBufferPool this
could takeup a lot of memory if the BoundedByteBufferPool's moving average settles down towards
a higher value 
> See the discussion here [HBASE-13819-comment|https://issues.apache.org/jira/browse/HBASE-13819?focusedCommentId=15207822&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15207822]



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