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https://issues.apache.org/jira/browse/HBASE-15203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16426297#comment-16426297
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stack commented on HBASE-15203:
-------------------------------
Got committed w/ a misformatted JIRA ID
commit 2cf8af5bf1d501156cbb3b421cf75c1051ead7d9
Author: ramkrishna <[email protected]>
Date: Thu Feb 4 11:44:46 2016 +0530
HBASE-HBASE-15203 Reduce garbage created by path.toString() during
Checksum verification (Ram)
> Reduce garbage created by path.toString() during Checksum verification
> ----------------------------------------------------------------------
>
> Key: HBASE-15203
> URL: https://issues.apache.org/jira/browse/HBASE-15203
> Project: HBase
> Issue Type: Sub-task
> Components: regionserver
> Reporter: ramkrishna.s.vasudevan
> Assignee: ramkrishna.s.vasudevan
> Priority: Minor
> Fix For: 1.3.0, 2.0.0
>
> Attachments: HBASE-15203.patch, HBASE-15203_1.patch,
> HBASE-15203_2.patch, HBASE-15203_branch-1.1.patch
>
>
> When we try to read a block we do checksum verification for which we need the
> file name in which the block belongs to. So we do Path.toString() every time.
> This seems to create around 163MB of char[] that is garbage collected in a
> simple scan run. It is also visible in writes but the impact is lesser. In
> overall write/read profile the top 2 factors are byte[] and char[]. This
> toString() can easily be avoided and reduce its share from the total. To make
> it more precise in 1 min of profiling, among the 1.8G of garbage created by
> StringBuilder.toString - this path.toString() was contributing around 3.5%.
> After the patch this is totally not there.
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