daimin created HDFS-16510:
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             Summary: Fix EC decommission when rack is not enough
                 Key: HDFS-16510
                 URL: https://issues.apache.org/jira/browse/HDFS-16510
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: block placement, ec
    Affects Versions: 3.3.2, 3.3.1
            Reporter: daimin
            Assignee: daimin


The decommission always fail when we start decommission multiple nodes on a 
cluster whose racks is not enough, a cluster with 6 racks to deploy RS-6-3, for 
example.

We find that those decommission nodes cover at least a rack, it's actulaly like 
we are decommission one or more racks. And rack decommission is not well 
supported currently, especially for cluster whose racks is not enough already.



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