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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15177) Reduce garbage created under high load
Date Fri, 05 Feb 2016 04:54:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15133658#comment-15133658
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ramkrishna.s.vasudevan commented on HBASE-15177:
------------------------------------------------

Sorry for the late reviews here. 
bq.Had to bring back the buffer.position(offset) that was removed from v0. This is needed
since in case cells are compressed, we are creating an BBIS over the BB.
Okie. I can see now why it is needed 
bq.Ram filed issue on TestFlushSnapshotFromClient being flakey.
I filed an issue for TestBlockEvictionFromclient - https://issues.apache.org/jira/browse/HBASE-15215.
Not for TestFlushSnapshotFromClient.
Thanks for the patch [~enis].


> Reduce garbage created under high load
> --------------------------------------
>
>                 Key: HBASE-15177
>                 URL: https://issues.apache.org/jira/browse/HBASE-15177
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Enis Soztutar
>            Assignee: Enis Soztutar
>             Fix For: 2.0.0, 1.3.0
>
>         Attachments: Screen Shot 2016-01-26 at 10.03.48 PM.png, Screen Shot 2016-01-26
at 10.03.56 PM.png, Screen Shot 2016-01-26 at 10.06.16 PM.png, Screen Shot 2016-01-26 at 10.15.15
PM.png, hbase-15177_v0.patch, hbase-15177_v1.patch, hbase-15177_v2.patch, hbase-15177_v3.patch,
hbase-15177_v4.patch, hbase-15177_v4.patch
>
>
> I have been doing some profiling of the garbage being created. The idea was to follow
up on HBASE-14490 and experiment with offheap IPC byte buffers and byte buffer re-use. However,
without changing the IPC byte buffers for now, there are a couple of (easy) improvements that
I've identified from profiling: 
> 1. RPCServer.Connection.processRequest() should work with ByteBuffer instead of byte[]
and not-recreate CodedInputStream a few times. 
> 2. RSRpcServices.getRegion() allocates two byte arrays for region, while only 1 is needed.
> 3. AnnotationReadingPriorityFunction is very expensive in allocations. Mainly it allocates
the regionName byte[] to get the table name. We already set the priority for most of the operations
(multi, get, increment, etc) but we are only reading the priority in case of multi. We should
use the priority from the client side. 
> Lets do the simple improvements in this patch, we can get to IPC buffer re-use in HBASE-14490.




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