hadoop-common-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "stack (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4802) RPC Server send buffer retains size of largest response ever sent
Date Tue, 09 Dec 2008 23:40:46 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-4802?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

stack updated HADOOP-4802:

    Attachment: 4802-v4-TRUNK.patch

Made HBAOS static (Had to move it out of Server#Handler to do so).  Removed pointer to this
issue from comments (Can go to svn log if really needed).

> RPC Server send buffer retains size of largest response ever sent 
> ------------------------------------------------------------------
>                 Key: HADOOP-4802
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4802
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: ipc
>    Affects Versions: 0.18.2, 0.19.0
>            Reporter: stack
>         Attachments: 4802-v2.patch, 4802-v3.patch, 4802-v4-TRUNK.patch, 4802.patch
> The stack-based ByteArrayOutputStream in Server.Hander is reset each time through the
run loop.  This will set the BAOS 'size' back to zero but the allocated backing buffer is
unaltered.  If during an Handlers' lifecycle, any particular RPC response was fat -- Megabytes,
even -- the buffer expands during the write to accommodate the particular response but then
never shrinks subsequently.  If a hosting Server has had more than one 'fat payload' occurrence,
the resultant occupied heap can provoke memory woes (See https://issues.apache.org/jira/browse/HBASE-900?focusedCommentId=12654009#action_12654009
for an extreme example; occasional payloads of 20-50MB with 30 handlers robbed the heap of

This message is automatically generated by JIRA.
You can reply to this email to add a comment to the issue online.

View raw message