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From "ryan rawson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1028) INode.getPathNames could split more efficiently
Date Sat, 06 Mar 2010 07:25:27 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12842215#action_12842215
] 

ryan rawson commented on HDFS-1028:
-----------------------------------

+1 - tsuna on our staff found that in a string intensive processing mini-app, he was able
to speed his app up by a factor of 2 by not using that API.  Also PrintWriter is many times
faster than PrintStream.

> INode.getPathNames could split more efficiently
> -----------------------------------------------
>
>                 Key: HDFS-1028
>                 URL: https://issues.apache.org/jira/browse/HDFS-1028
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>            Reporter: Todd Lipcon
>            Priority: Minor
>
> INode.getPathnames uses String.split(String) which actually uses the full Java regex
implementation. Since we're always splitting on a single char, we could implement a faster
one like StringUtils.split() (except without the escape character). This takes a significant
amount of CPU during FSImage loading so should be a worthwhile speedup.

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