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From "Esteban Gutierrez (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11288) Manually allow block replication/deletion in Safe Mode
Date Tue, 03 Jan 2017 22:42:58 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15796435#comment-15796435
] 

Esteban Gutierrez commented on HDFS-11288:
------------------------------------------

I think the safe mode semantic shouldn't be changed, probably the easiest approach is to have
something like a single user (or admin group) switch for that matter.

> Manually allow block replication/deletion in Safe Mode
> ------------------------------------------------------
>
>                 Key: HDFS-11288
>                 URL: https://issues.apache.org/jira/browse/HDFS-11288
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: namenode
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Lukas Majercak
>
> Currently, the Safe Mode does not allow block replication/deletion, which makes sense,
especially on startup, as we do not want to replicate blocks unnecessarily. 
> An issue we have seen in our clusters though, is when the NameNode is getting overwhelmed
with the amounts of needed replications; in which case, we would like to be able to manually
set the NN to be in a state in which R/Ws to FS are disallowed but the NN continues replicating/deleting
blocks.



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