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https://issues.apache.org/jira/browse/HDFS-13128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16358483#comment-16358483
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Kihwal Lee commented on HDFS-13128:
-----------------------------------
What do you see in the balancer log? Look for something like this.
{noformat}
[main] INFO balancer.Balancer: namenodes = [hdfs://mynn.com:8020]
{noformat}
Do you see two entries that essentially point to the same namenode?
> HDFS balancer in single node cluster fails with "Another Balancer is
> running.."
> -------------------------------------------------------------------------------
>
> Key: HDFS-13128
> URL: https://issues.apache.org/jira/browse/HDFS-13128
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: balancer & mover, hdfs
> Affects Versions: 2.7.3
> Reporter: Zbigniew Kostrzewa
> Priority: Minor
>
> In a single node "cluster", HDFS balancer fails with:
> {noformat}
> Time Stamp Iteration# Bytes Already Moved Bytes Left To Move Bytes Being Moved
> java.io.IOException: Another Balancer is running.. Exiting ...
> {noformat}
> and in Name Node logs there is:
> {noformat}
> 2018-02-09 07:23:21,671 INFO org.apache.hadoop.hdfs.StateChange: BLOCK*
> allocate blk_1073741865_1041{UCState=UNDER_CONSTRUCTION, truncateBlock=null,
> primaryNodeIndex=-1,
> replicas=[ReplicaUC[[DISK]DS-dae233d3-5c71-498e-9a8b-669bff3fccdf:NORMAL:10.9.4.184:30010|RBW]]}
> for /system/balancer.id
> 2018-02-09 07:23:21,739 INFO org.apache.hadoop.hdfs.StateChange: BLOCK*
> fsync: /system/balancer.id for DFSClient_NONMAPREDUCE_-1126407107_1
> 2018-02-09 07:23:21,758 WARN org.apache.hadoop.hdfs.StateChange: DIR*
> NameSystem.append: Failed to APPEND_FILE /system/balancer.id for
> DFSClient_NONMAPREDUCE_1275100437_1 on 10.9.4.184 because this file lease is
> currently owned by DFSClient_NONMAPREDUCE_-1126407107_1 on 10.9.4.184
> 2018-02-09 07:23:21,758 INFO org.apache.hadoop.ipc.Server: IPC Server handler
> 1 on 8020, call org.apache.hadoop.hdfs.protocol.ClientProtocol.append from
> 10.9.4.184:49781 Call#12 Retry#0:
> org.apache.hadoop.hdfs.protocol.AlreadyBeingCreatedException: Failed to
> APPEND_FILE /system/balancer.id for DFSClient_NONMAPREDUCE_1275100437_1 on
> 10.9.4.184 because this file lease is currently owned by
> DFSClient_NONMAPREDUCE_-1126407107_1 on 10.9.4.184
> 2018-02-09 07:23:21,773 INFO BlockStateChange: BLOCK* addStoredBlock:
> blockMap updated: 10.9.4.184:30010 is added to
> blk_1073741865_1041{UCState=UNDER_CONSTRUCTION, truncateBlock=null,
> primaryNodeIndex=-1,
> replicas=[ReplicaUC[[DISK]DS-dae233d3-5c71-498e-9a8b669bff3fccdf:NORMAL:10.9.4.184:30010|RBW]]}
> size 15
> 2018-02-09 07:23:21,776 INFO org.apache.hadoop.hdfs.StateChange: DIR*
> completeFile: /system/balancer.id is closed by
> DFSClient_NONMAPREDUCE_-1126407107_1{noformat}
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