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From "jiraposter@reviews.apache.org (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4192) Optimize HLog for Throughput Using Delayed RPCs
Date Thu, 11 Aug 2011 06:59:28 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13082967#comment-13082967

jiraposter@reviews.apache.org commented on HBASE-4192:

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Review request for hbase.



1.  Add hbase.region.wal.batchentries configuration parameter.  If this is
enabled, batch entries to the HLog in a queue.
2.  Use delayed RPCs for sync requests when aggresive batching is enabled.
This frees up RPC handler threads for the duration of the sync.
3.  Pass the RPC server instance all the way to down to HLog.  This is needed
to find out the current remote call, mark it as delayed, and finally complete
it when the sync is done.
4.  Use the region read-write consistency control to avoid exposing to
RegionScanners edits which have not yet been synced.
5.  Change a few tests which directly create HRegions or HLogs.  The
rpcServers passed in are null, HLog falls back to classic RPCs when it has no
knowledge of the RPC server.
6.  Add TestBatchEntriesLogRolling, which is identical to TestLogRolling,
except that it uses aggressive batching.  I'm not sure how to add tests that
verify the same functionality but don't duplicate code, suggestion are

The new parameter is disabled by default.

This addresses bug HBASE-4192.


  src/main/java/org/apache/hadoop/hbase/ipc/HBaseServer.java 6fb1da7 
  src/main/java/org/apache/hadoop/hbase/master/HMaster.java a00b93d 
  src/main/java/org/apache/hadoop/hbase/master/MasterFileSystem.java 2f86f04 
  src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java 83ff7b2 
  src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java f22fb6e 
  src/main/java/org/apache/hadoop/hbase/regionserver/ReadWriteConsistencyControl.java 8ec53d3

  src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLog.java 887f736 
  src/main/java/org/apache/hadoop/hbase/util/HMerge.java 9f0499e 
  src/main/java/org/apache/hadoop/hbase/util/MetaUtils.java af8d734 
  src/test/java/org/apache/hadoop/hbase/HBaseTestCase.java bf8004b 
  src/test/java/org/apache/hadoop/hbase/TestScanMultipleVersions.java d7baba4 
  src/test/java/org/apache/hadoop/hbase/coprocessor/TestCoprocessorInterface.java 36816e8

  src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestBatchEntriesLogRolling.java PRE-CREATION

  src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestHLogSplit.java de28418 
  src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestWALActionsListener.java dc43eb2


Diff: https://reviews.apache.org/r/1463/diff


All unit tests run with aggressive batching turned on and off.



> 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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