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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11597) Ozone: Add Ratis management API
Date Wed, 31 May 2017 02:21:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16030506#comment-16030506

Tsz Wo Nicholas Sze commented on HDFS-11597:

> The question I was trying to ask here was – What happens if the SCM restarts with this
change ? Does SCM remember this Ratis cluster information ? Or do we expect to relearn that
info from heartbeats or something ? 

This patch does not try to solve this problem.  All the states regarding to RatisManager currently
is in memory but not persist to disk.  As you mentioned, do we want to persist the Ratis cluster
states in SCM?  Or just use heartbeats to relearn them?  I think we should persist the Ratis
cluster states since they correspond to the open containers (For closed containers, the Ratis
cluster is closed).

How does SCM current persist other states?  We should do the same for RatisManager.

> Ozone: Add Ratis management API
> -------------------------------
>                 Key: HDFS-11597
>                 URL: https://issues.apache.org/jira/browse/HDFS-11597
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ozone
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Tsz Wo Nicholas Sze
>         Attachments: HDFS-11597-HDFS-7240.20170522.patch, HDFS-11597-HDFS-7240.20170523.patch,
HDFS-11597-HDFS-7240.20170524.patch, HDFS-11597-HDFS-7240.20170528b.patch, HDFS-11597-HDFS-7240.20170528.patch,
> We need APIs to manage Ratis clusters for the following operations:
> - create cluster;
> - close cluster;
> - get members; and
> - update members.

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