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From "Jakob Homan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1081) Performance regression in DistributedFileSystem::getFileBlockLocations in secure systems
Date Tue, 20 Jul 2010 21:22:53 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12890453#action_12890453
] 

Jakob Homan commented on HDFS-1081:
-----------------------------------

Hudon's too slow.  Manually ran tests. TestFileConcurrentReader and TestFiHFlush fail on trunk
for me as well. TestFileAppend4, TestBlockToken and TestJspHelper all pass for me with the
patch (this is known behavior Kan's looking into).  I'm going to commit the patch.

> Performance regression in DistributedFileSystem::getFileBlockLocations in secure systems
> ----------------------------------------------------------------------------------------
>
>                 Key: HDFS-1081
>                 URL: https://issues.apache.org/jira/browse/HDFS-1081
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: security
>    Affects Versions: 0.22.0
>            Reporter: Jakob Homan
>            Assignee: Jakob Homan
>             Fix For: 0.22.0
>
>         Attachments: bm1081.scala, HADOOP-1081-Y20-1.patch, HADOOP-1081-Y20-2.patch,
HDFS-1081-trunk.patch, HDFS-1081-trunk.patch, results.xlsx
>
>
> We've seen a significant decrease in the performance of DistributedFileSystem::getFileBlockLocations()
with security turned on Y20. This JIRA is for correcting and tracking it both on Y20 and trunk.

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