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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8856) Make LeaseManager#countPath O(1)
Date Fri, 07 Aug 2015 02:06:45 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14661192#comment-14661192
] 

Hudson commented on HDFS-8856:
------------------------------

FAILURE: Integrated in Hadoop-trunk-Commit #8276 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/8276/])
HDFS-8856. Make LeaseManager#countPath O(1). (Contributed by Arpit Agarwal) (arp: rev 6d4eee718a3fe1450a627128eb94728011bd9b68)
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestLeaseManager.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/Checkpointer.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/LeaseManager.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java


> Make LeaseManager#countPath O(1)
> --------------------------------
>
>                 Key: HDFS-8856
>                 URL: https://issues.apache.org/jira/browse/HDFS-8856
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.7.2
>            Reporter: Arpit Agarwal
>            Assignee: Arpit Agarwal
>             Fix For: 2.8.0
>
>         Attachments: HDFS-8856.01.patch, HDFS-8856.02.patch, HDFS-8856.03.patch, HDFS-8856.04.patch
>
>
> {{LeaseManager#countPath}} loops over all existing lease holders to compute the pending
lease count. We can just track the pending leased files so it runs in constant time.



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