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https://issues.apache.org/jira/browse/HDFS-17534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17852255#comment-17852255
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ASF GitHub Bot commented on HDFS-17534:
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yuanboliu commented on PR #6861:
URL: https://github.com/apache/hadoop/pull/6861#issuecomment-2148757966
@slfan1989 Thanks for your reply. The major idea is that follower
sub-clusters are considerred as backup clusters, we don't use them until leader
subcluster not working at all. hdfs has HA state and replications and ensure
disaster tolerance within cluster. We're using this mode to make cross-cluster
disaster tolerance work, so clients don't have to wait until the major cluster
recovering, which takes long time.
So basically this mode is not about using RBF to share overloading, but
implement some kind of crosss-cluster disaster tolerance.
> RBF: Support leader follower mode for multiple subclusters
> ----------------------------------------------------------
>
> Key: HDFS-17534
> URL: https://issues.apache.org/jira/browse/HDFS-17534
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: rbf
> Reporter: Yuanbo Liu
> Assignee: Yuanbo Liu
> Priority: Major
> Labels: pull-request-available
>
> Currently there are five modes in multiple subclusters like
> HASH, LOCAL, RANDOM, HASH_ALL,SPACE;
> Proposal a new mode called leader/follower mode. routers try to write to
> leader subcluster as many as possible. When routers read data, put leader
> subcluster into first rank.
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