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https://issues.apache.org/jira/browse/HDFS-5046?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Harsh J resolved HDFS-5046.
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Resolution: Not A Problem
bq. a). decommission progress hangs and the status always be 'Waiting DataNode
status: Decommissioned'. But, if I execute 'hadoop dfs -setrep -R 2 /', the
decommission continues and will be completed finally.
The step (a) points to your problem and solution both. You have files
being created with repl=3 on a 2 DN cluster which will prevent
decommission. This is not a bug.
> Hang when add/remove a datanode into/from a 2 datanode cluster
> --------------------------------------------------------------
>
> Key: HDFS-5046
> URL: https://issues.apache.org/jira/browse/HDFS-5046
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 1.1.1
> Environment: Red Hat Enterprise Linux Server release 5.3, 64 bit
> Reporter: sam liu
>
> 1. Install a Hadoop 1.1.1 cluster, with 2 datanodes: dn1 and dn2. And, in
> hdfs-site.xml, set the 'dfs.replication' to 2
> 2. Add node dn3 into the cluster as a new datanode, and did not change the
> 'dfs.replication' value in hdfs-site.xml and keep it as 2
> note: step 2 passed
> 3. Decommission dn3 from the cluster
> Expected result: dn3 could be decommissioned successfully
> Actual result:
> a). decommission progress hangs and the status always be 'Waiting DataNode
> status: Decommissioned'. But, if I execute 'hadoop dfs -setrep -R 2 /', the
> decommission continues and will be completed finally.
> b). However, if the initial cluster includes >= 3 datanodes, this issue won't
> be encountered when add/remove another datanode. For example, if I setup a
> cluster with 3 datanodes, and then I can successfully add the 4th datanode
> into it, and then also can successfully remove the 4th datanode from the
> cluster.
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