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https://issues.apache.org/jira/browse/HBASE-10094?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack updated HBASE-10094:
--------------------------
Attachment: 10094v2.txt
Add some metrics on sync and rate at which we are writing. Below is sample of
what we have now going against localfs and then same passing a syncInterval
flag set to 100:
org.apache.hadoop.hbase.regionserver.wal.HLogPerformanceEvaluation:
append:
count = 680000000
mean rate = 67244.75 bytes/ms
1-minute rate = 52488.70 bytes/ms
5-minute rate = 50267.51 bytes/ms
15-minute rate = 49882.70 bytes/ms
sync:
count = 1000000
mean rate = 98.88 syncs/ms
1-minute rate = 77.16 syncs/ms
5-minute rate = 73.89 syncs/ms
15-minute rate = 73.33 syncs/ms
# Every 100 appends.
org.apache.hadoop.hbase.regionserver.wal.HLogPerformanceEvaluation:
append:
count = 585820000
mean rate = 85046.52 bytes/ms
1-minute rate = 74908.80 bytes/ms
5-minute rate = 74908.80 bytes/ms
15-minute rate = 74908.80 bytes/ms
sync:
count = 8643
mean rate = 1.25 syncs/ms
1-minute rate = 1.11 syncs/ms
5-minute rate = 1.11 syncs/ms
15-minute rate = 1.11 syncs/ms
We probably want to settle somewhere at syncing about every 10ms or so.
> Add batching to HLogPerformanceEvaluation
> -----------------------------------------
>
> Key: HBASE-10094
> URL: https://issues.apache.org/jira/browse/HBASE-10094
> Project: HBase
> Issue Type: Sub-task
> Components: Performance, wal
> Reporter: stack
> Assignee: Himanshu Vashishtha
> Attachments: 10094v2.txt
>
>
> As Himanshu points out in the the parent issue, HLogPE is using an unorthodox
> API appending edits to the WAL; it is using an API that is meant for tests
> only that does an append immediately followed by a sync call.
> In normal deploy, WAL appends are done as a bunch of appends followed by a
> sync on the tail of the transaction -- not a sync per append.
> This issue is about changing HLogPE to use append and then sync. It also
> adds an argument so you can specifying batching of a set of appends before
> the sync is called. The latter lets HLogPE mimic multi puts that use the
> minibatch... which appends, appends, appends.. and then syncs.
> Assigning to Himanshu for review.
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