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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1133) Speedup INode.getPathNames
Date Wed, 05 May 2010 21:44:03 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1133?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12864529#action_12864529

Todd Lipcon commented on HDFS-1133:

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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