sam liu created HDFS-5046:
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Summary: 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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