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https://issues.apache.org/jira/browse/HDFS-10912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15530970#comment-15530970
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Anu Engineer commented on HDFS-10912:
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[~jingzhao] Thanks for your comments.
bq. the first one is to make sure the SCM receives enough DN registration. If
we persist the container-node mapping in SCM, we do not need to wait for full
container reports. Also SCM does not take the responsibility for maintaining
the container states/durability, thus this type of safemode is very lightweight
compared with the current NN safemode. (maybe we can rename it ...)
Completely agree, Arpit also made the same comment, and suggested that I use
something like a "chill mode" -- to indicate we are just waiting for a minimal
set of info instead of classical safe mode. Shall I rename it as "Chill Mode"
to indicate this is something other than the safe mode. I am open to any naming
suggestions you might have.
bq. Therefore, to me forceExitSafeMode/forceEnterSafeMode/isInManualSafeMode
can be moved to SCM level. forceExitSafeMode will reset both the manual
safemode and the safemode in nodemanager.
Absolutely, in fact when we have to the full SCM you will see that this call is
used only by SCM and SCM in turn will expose this as a single call. We are just
layering these calls for time being. When SCM code is in, you will see that a
forceEnterSafeMode will put both container manager and node manager into safe
mode via a single call.
> Ozone:SCM: Add safe mode support to NodeManager.
> ------------------------------------------------
>
> Key: HDFS-10912
> URL: https://issues.apache.org/jira/browse/HDFS-10912
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ozone
> Affects Versions: HDFS-7240
> Reporter: Anu Engineer
> Assignee: Anu Engineer
> Attachments: HDFS-10912-HDFS-7240.001.patch
>
>
> Add Safe mode support : That is add the ability to force exit or enter safe
> mode. As well as get the current safe mode status from node manager.
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