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https://issues.apache.org/jira/browse/HDFS-9350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14985738#comment-14985738
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Staffan Friberg commented on HDFS-9350:
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It does, but the problem is that the call to Long.toString will actually
allocate a new String to be appended, and the call to getBlockname sometimes
(unless correctly inlined will do the same). So you don't get a single append
chain with SB in this case.
> Avoid creating temprorary strings in Block.toString() and getBlockName()
> ------------------------------------------------------------------------
>
> Key: HDFS-9350
> URL: https://issues.apache.org/jira/browse/HDFS-9350
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: performance
> Affects Versions: 2.7.1
> Reporter: Staffan Friberg
> Assignee: Staffan Friberg
> Priority: Minor
> Attachments: HDFS-9350.001.patch
>
>
> Minor change to use StringBuilders directly to avoid creating temporary
> strings of Long and Block name when doing toString on a Block.
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