Zbigniew Kostrzewa created HDFS-13128:
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Summary: 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
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 becaus
e 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, primar
yNodeIndex=-1,
replicas=[ReplicaUC[[DISK]DS-dae233d3-5c71-498e-9a8b-669bff3fccdf: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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