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https://issues.apache.org/jira/browse/HDFS-1133?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12864529#action_12864529
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Todd Lipcon commented on HDFS-1133:
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I think this is duplicate of HDFS-1028
HADOOP-6623 is the split implmentation we need, and just needs a commit.
> Speedup INode.getPathNames
> --------------------------
>
> Key: HDFS-1133
> URL: https://issues.apache.org/jira/browse/HDFS-1133
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Dmytro Molkov
>
> Currently the method is implemented with the usage of String.split method.
> But it is slow because it does regexp parsing of the string.
> If we were to reuse the StringUtil.split method which linearly goes through
> the string and splits it on the delimiter characters it will speed up the
> method by ~20%. Which is great for NameNode startup time. We can cut about
> 20% of startup time with this change.
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