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From "Lars Hofhansl (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4956) Control direct memory buffer consumption by HBaseClient
Date Wed, 07 Dec 2011 07:18:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13164199#comment-13164199

Lars Hofhansl commented on HBASE-4956:

We might not have to go all the way to use netty (although that would be nice).
If we find that it is possible to avoid calling HBaseClient.Connection.sendParam from the
client thread, but have the call actually be made from the Connection thread (after the callable
representing the operation was queued), we have limited the number of threads that will have
cached DirectBuffer on their behalf.
Stack suggested the only reason for the direct call might be to pass errors back to the client.
We could hand the client a Deferred or Future that will eventually hold any encountered exception,
the client could (and would be default to keep the current synchronous behavior) also wait
on that object.
> Control direct memory buffer consumption by HBaseClient
> -------------------------------------------------------
>                 Key: HBASE-4956
>                 URL: https://issues.apache.org/jira/browse/HBASE-4956
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Ted Yu
> As Jonathan explained here https://groups.google.com/group/asynchbase/browse_thread/thread/c45bc7ba788b2357?pli=1
, standard hbase client inadvertently consumes large amount of direct memory.
> We should consider using netty for NIO-related tasks.

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