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Date: Sat, 13 Aug 2011 13:59:28 +0000 (UTC)
From: "jiraposter@reviews.apache.org (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HBASE-4192) Optimize HLog for Throughput Using
 Delayed RPCs
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    [ https://issues.apache.org/jira/browse/HBASE-4192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13084618#comment-13084618 ] 

jiraposter@reviews.apache.org commented on HBASE-4192:
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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/1463/#review1440
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src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLog.java
<https://reviews.apache.org/r/1463/#comment3334>

    Some kind of counter for this case would be useful, I think.


- Ted


On 2011-08-12 23:44:23, Vlad Dogaru wrote:
bq.  
bq.  -----------------------------------------------------------
bq.  This is an automatically generated e-mail. To reply, visit:
bq.  https://reviews.apache.org/r/1463/
bq.  -----------------------------------------------------------
bq.  
bq.  (Updated 2011-08-12 23:44:23)
bq.  
bq.  
bq.  Review request for hbase.
bq.  
bq.  
bq.  Summary
bq.  -------
bq.  
bq.  Changes:
bq.  
bq.  1.  Add hbase.region.wal.batchentries configuration parameter.  If this is
bq.  enabled, batch entries to the HLog in a queue.
bq.  2.  Use delayed RPCs for sync requests when aggresive batching is enabled.
bq.  This frees up RPC handler threads for the duration of the sync.
bq.  3.  Pass the RPC server instance all the way to down to HLog.  This is needed
bq.  to find out the current remote call, mark it as delayed, and finally complete
bq.  it when the sync is done.
bq.  4.  Use the region read-write consistency control to avoid exposing to
bq.  RegionScanners edits which have not yet been synced.
bq.  5.  Change a few tests which directly create HRegions or HLogs.  The
bq.  rpcServers passed in are null, HLog falls back to classic RPCs when it has no
bq.  knowledge of the RPC server.
bq.  6.  Add TestBatchEntriesLogRolling, which is identical to TestLogRolling,
bq.  except that it uses aggressive batching.  I'm not sure how to add tests that
bq.  verify the same functionality but don't duplicate code, suggestion are
bq.  welcome.
bq.  
bq.  The new parameter is disabled by default.
bq.  
bq.  
bq.  This addresses bug HBASE-4192.
bq.      https://issues.apache.org/jira/browse/HBASE-4192
bq.  
bq.  
bq.  Diffs
bq.  -----
bq.  
bq.    src/main/java/org/apache/hadoop/hbase/ipc/HBaseServer.java 7117bce 
bq.    src/main/java/org/apache/hadoop/hbase/master/HMaster.java a00b93d 
bq.    src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java 83ff7b2 
bq.    src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java 7a917da 
bq.    src/main/java/org/apache/hadoop/hbase/regionserver/ReadWriteConsistencyControl.java 8ec53d3 
bq.    src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLog.java 887f736 
bq.    src/main/resources/hbase-default.xml 66548ca 
bq.    src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestWALActionsListener.java dc43eb2 
bq.    src/test/java/org/apache/hadoop/hbase/replication/regionserver/TestReplicationSourceManager.java 381ac90 
bq.  
bq.  Diff: https://reviews.apache.org/r/1463/diff
bq.  
bq.  
bq.  Testing
bq.  -------
bq.  
bq.  All unit tests run with aggressive batching turned on and off.
bq.  
bq.  
bq.  Thanks,
bq.  
bq.  Vlad
bq.  
bq.


> Optimize HLog for Throughput Using Delayed RPCs
> -----------------------------------------------
>
>                 Key: HBASE-4192
>                 URL: https://issues.apache.org/jira/browse/HBASE-4192
>             Project: HBase
>          Issue Type: New Feature
>          Components: wal
>    Affects Versions: 0.92.0
>            Reporter: Vlad Dogaru
>            Priority: Minor
>
> Introduce a new HLog configuration parameter (batchEntries) for more aggressive batching of appends.  If this is enabled, HLog appends are not written to the HLog writer immediately, but batched and written either periodically or when a sync is requested.  Because sync times become larger, they use delayed RPCs to free up RPC handler threads.

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