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Posted to hdfs-issues@hadoop.apache.org by "Kihwal Lee (JIRA)" <ji...@apache.org> on 2018/02/09 14:45:00 UTC
[jira] [Commented] (HDFS-13128) HDFS balancer in single node
cluster fails with "Another Balancer is running.."
[ https://issues.apache.org/jira/browse/HDFS-13128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16358483#comment-16358483 ]
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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