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From "Dmytro Molkov (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HDFS-1133) Speedup INode.getPathNames
Date Wed, 05 May 2010 22:44:07 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1133?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Dmytro Molkov resolved HDFS-1133.

    Resolution: Duplicate

> Speedup INode.getPathNames
> --------------------------
>                 Key: HDFS-1133
>                 URL: https://issues.apache.org/jira/browse/HDFS-1133
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Dmytro Molkov
>            Assignee: Dmytro Molkov
>         Attachments: HDFS-split.patch
> 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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