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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8716) introduce a new config specifically for safe mode block count
Date Wed, 09 Sep 2015 16:54:46 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8716?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14737186#comment-14737186
] 

Hudson commented on HDFS-8716:
------------------------------

FAILURE: Integrated in Hadoop-trunk-Commit #8421 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/8421/])
HDFS-8716. Introduce a new config specifically for safe mode block count. Contributed by Chang
Li. (kihwal: rev 4d13335fc93780126bab35de92a640fa31b204d9)
* hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java


> introduce a new config specifically for safe mode block count
> -------------------------------------------------------------
>
>                 Key: HDFS-8716
>                 URL: https://issues.apache.org/jira/browse/HDFS-8716
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Chang Li
>            Assignee: Chang Li
>             Fix For: 3.0.0, 2.8.0
>
>         Attachments: HDFS-8716.1.patch, HDFS-8716.2.patch, HDFS-8716.3.patch, HDFS-8716.4.patch,
HDFS-8716.5.patch, HDFS-8716.6.patch, HDFS-8716.7.patch, HDFS-8716.7.patch, HDFS-8716.8.patch
>
>
> During the start up, namenode waits for n replicas of each block to be reported by datanodes
before exiting the safe mode. Currently n is tied to the min replicas config. We could set
min replicas to more than one but we might want to exit safe mode as soon as each block has
one replica reported. This can be worked out by introducing a new config variable for safe
mode block count



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