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From "Rushabh S Shah (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12420) Disable Namenode format for prod clusters when data already exists
Date Fri, 15 Sep 2017 00:22:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16167148#comment-16167148
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Rushabh S Shah commented on HDFS-12420:
---------------------------------------

Couple of minor comments from me.
1.
bq. +  public static final String  HADOOP_CLUSTER_IS_PROD = "hadoop.is.prod.cluster";
This is just a namenode side config. We should prefix it as {{dfs.namenode.is.prod.cluster}}.
The equivalent member variable name should be {{DFS_NAMENODE_IS_PROD_CLUSTER}}.


2.
The config key should de defined in {{hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java}}
and not {{CommonConfigurationKeys.java}}
Also the default value should be defined in {{hdfs-default.xml}} instead of {{core-default.xml}}

Other than that the patch looks good to me.

> Disable Namenode format for prod clusters when data already exists
> ------------------------------------------------------------------
>
>                 Key: HDFS-12420
>                 URL: https://issues.apache.org/jira/browse/HDFS-12420
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Ajay Kumar
>            Assignee: Ajay Kumar
>         Attachments: HDFS-12420.01.patch, HDFS-12420.02.patch, HDFS-12420.03.patch, HDFS-12420.04.patch,
HDFS-12420.05.patch
>
>
> Disable NameNode format to avoid accidental formatting of Namenode in production cluster.
If someone really wants to delete the complete fsImage, they can first delete the metadata
dir and then run {code} hdfs namenode -format{code} manually.



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