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https://issues.apache.org/jira/browse/HBASE-4192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13082997#comment-13082997
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jirapos...@reviews.apache.org commented on HBASE-4192:
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will look at this in detail tomorrow/fri, but, meanwhile, do you have some data
on what the throughput improvement is for heavy write workloads?
- Todd
On 2011-08-11 06:59:28, 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 2011-08-11 06:59:28)
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 6fb1da7
bq. src/main/java/org/apache/hadoop/hbase/master/HMaster.java a00b93d
bq. src/main/java/org/apache/hadoop/hbase/master/MasterFileSystem.java
2f86f04
bq. src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java 83ff7b2
bq. src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
f22fb6e
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/java/org/apache/hadoop/hbase/util/HMerge.java 9f0499e
bq. src/main/java/org/apache/hadoop/hbase/util/MetaUtils.java af8d734
bq. src/test/java/org/apache/hadoop/hbase/HBaseTestCase.java bf8004b
bq. src/test/java/org/apache/hadoop/hbase/TestScanMultipleVersions.java
d7baba4
bq.
src/test/java/org/apache/hadoop/hbase/coprocessor/TestCoprocessorInterface.java
36816e8
bq.
src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestBatchEntriesLogRolling.java
PRE-CREATION
bq.
src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestHLogSplit.java
de28418
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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