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https://issues.apache.org/jira/browse/HBASE-5897?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lars Hofhansl updated HBASE-5897:
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Attachment: 5897-simple.txt
bq. the prePut hook runs through all the BatchOperationInProgress during every
mini-batch
Interesting observation. I wonder whether we do something simple (like attached
patch) in 0.94 and Todd's fix in 0.96.
The attached -simple patch at least makes sure we start from the current batch
index. operations towards the end of the set of batches would still pass
through prePut multiple times, which is bad.
> prePut coprocessor hook causing substantial CPU usage
> -----------------------------------------------------
>
> Key: HBASE-5897
> URL: https://issues.apache.org/jira/browse/HBASE-5897
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.92.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: 5897-simple.txt, hbase-5897.txt
>
>
> I was running an insert workload against trunk under oprofile and saw that a
> significant portion of CPU usage was going to calling the "prePut"
> coprocessor hook inside doMiniBatchPut, even though I don't have any
> coprocessors installed. I ran a million-row insert and collected CPU time
> spent in the RS after commenting out the preput hook, and found CPU usage
> reduced by 33%.
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