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https://issues.apache.org/jira/browse/HADOOP-9981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13777805#comment-13777805
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Colin Patrick McCabe commented on HADOOP-9981:
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bq. lines longer than 80 chars
fixed
bq. Let's use @Ignore annotations on the tests instead of removing them, I
assume we want to add them back in eventually?
good idea.
bq. Our symlink resolution right now is inconsistent: listStatus does not
resolve results, getFileStatus does...
Let's tackle the symlinks semantics for globStatus as part of HADOOP-9984.
This JIRA is just about the efficiency concerns.
bq. Also noticed that we have a little duplication in TestGlobPaths: trueFilter
is the same as AcceptAllFilter. AcceptPathsEndingInZ is also only used in the
removed test.
I added back in the tests with an {{ignore}}, and made {{trueFilter}} an
instance of {{AcceptAllFilter}}.
> Listing in RawLocalFileSystem is inefficient
> --------------------------------------------
>
> Key: HADOOP-9981
> URL: https://issues.apache.org/jira/browse/HADOOP-9981
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 2.3.0
> Reporter: Kihwal Lee
> Assignee: Colin Patrick McCabe
> Priority: Critical
> Attachments: HADOOP-9981.001.patch, HADOOP-9981.002.patch
>
>
> After HADOOP-9652, listStatus() or globStatus() calls against a local file
> system directory is very slow. A user was loading data from local file
> system to Hive and it took about 30 seconds. The same operation took less
> than a second pre-HADOOP-9652.
> The input path had many other files beside the input files and strace showed
> that fork & exec of stat against each and every one of them. jstack confirmed
> that this was being done from getNativeFileLinkStatus().
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