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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6315) Decouple recording edit logs from FSDirectory
Date Wed, 11 Jun 2014 17:39:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14028079#comment-14028079
] 

Hudson commented on HDFS-6315:
------------------------------

SUCCESS: Integrated in Hadoop-trunk-Commit #5681 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/5681/])
HDFS-6315. Decouple recording edit logs from FSDirectory. Contributed by Haohui Mai. (wheat9:
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1601960)
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestCommitBlockSynchronization.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFsLimits.java


> Decouple recording edit logs from FSDirectory
> ---------------------------------------------
>
>                 Key: HDFS-6315
>                 URL: https://issues.apache.org/jira/browse/HDFS-6315
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Haohui Mai
>            Assignee: Haohui Mai
>             Fix For: 2.5.0
>
>         Attachments: HDFS-6315.000.patch, HDFS-6315.001.patch, HDFS-6315.002.patch, HDFS-6315.003.patch,
HDFS-6315.004.patch, HDFS-6315.005.patch
>
>
> Currently both FSNamesystem and FSDirectory record edit logs. This design requires both
FSNamesystem and FSDirectory to be tightly coupled together to implement a durable namespace.
> This jira proposes to separate the responsibility of implementing the namespace and providing
durability with edit logs. Specifically, FSDirectory implements the namespace (which should
have no edit log operations), and FSNamesystem implement durability by recording the edit
logs.



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