Lei (Eddy) Xu created HDFS-10540:
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Summary: The CLI error message for disk balancer is not enabled is
not clear.
Key: HDFS-10540
URL: https://issues.apache.org/jira/browse/HDFS-10540
Project: Hadoop HDFS
Issue Type: Sub-task
Affects Versions: HDFS-1312
Reporter: Lei (Eddy) Xu
When running the {{hdfs diskbalancer}} against a DN whose disk balancer feature
is not enabled, it reports:
{code}
$ hdfs diskbalancer -plan 127.0.0.1 -uri hdfs://localhost
16/06/16 18:03:29 WARN util.NativeCodeLoader: Unable to load native-hadoop
library for your platform... using builtin-java classes where applicable
Internal error, Unable to create JSON string.
at
org.apache.hadoop.hdfs.server.datanode.DiskBalancer.getVolumeNames(DiskBalancer.java:260)
at
org.apache.hadoop.hdfs.server.datanode.DataNode.getDiskBalancerSetting(DataNode.java:3105)
at
org.apache.hadoop.hdfs.protocolPB.ClientDatanodeProtocolServerSideTranslatorPB.getDiskBalancerSetting(ClientDatanodeProtocolServerSideTranslatorPB.java:359)
at
org.apache.hadoop.hdfs.protocol.proto.ClientDatanodeProtocolProtos$ClientDatanodeProtocolService$2.callBlockingMethod(ClientDatanodeProtocolProtos.java:17515)
at
org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:617)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1073)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2086)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2082)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1693)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2080)
Caused by: org.apache.hadoop.hdfs.server.diskbalancer.DiskBalancerException:
Disk Balancer is not enabled.
at
org.apache.hadoop.hdfs.server.datanode.DiskBalancer.checkDiskBalancerEnabled(DiskBalancer.java:293)
at
org.apache.hadoop.hdfs.server.datanode.DiskBalancer.getVolumeNames(DiskBalancer.java:251)
... 11 more
{code}
We should not directly throw IOE to the user. And it should explicitly explain
the reason that the operation fails.
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