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https://issues.apache.org/jira/browse/HBASE-5897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13264449#comment-13264449
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Todd Lipcon commented on HBASE-5897:
------------------------------------
Test methodology: I'm running a single standalone HBase on local filesystem. I
rm the dir from /tmp, then start the master, create a table with a single
column family, then restart the master with "time bin/hbase master". I then
insert 1M rows from YCSB, and hit ^C on the master. I ran the test with the
preput hook left in, and with it commented out, and flipped between the two
setups twice to make sure I could reproduce. I'm reporting the user and system
CPU here, since the wall clock time is sensitive to how quickly I ran the
commands.
with hook commented out:
run 1:
user 1m57.760s
sys 0m3.300s
run 2:
user 1m54.840s
sys 0m3.870s
with cp hook left in:
run 1:
user 3m13.890s
sys 0m3.940s
run 2:
user 3m11.960s
sys 0m3.930s
I also re-ran the original oprofile analysis and "doMiniBatchPut" basically
dropped off the CPU profile results once I made this change.
I verified for sure that I have no coprocessors installed by adding a println
in RegionCoprocessorHost - it didn't print out.
> 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
>
> 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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