Wenxin He created HADOOP-14818:
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Summary: Can not show help message of
namenode/datanode/nodemanager when process started.
Key: HADOOP-14818
URL: https://issues.apache.org/jira/browse/HADOOP-14818
Project: Hadoop Common
Issue Type: Improvement
Components: bin
Affects Versions: 3.0.0-beta1
Reporter: Wenxin He
Priority: Minor
We should always get the help message whenever the process is started or not.
But now,
when datanode starts, we get an error message:
{noformat}
hadoop# bin/hdfs datanode -h
datanode is running as process 1701. Stop it first.
{noformat}
when datanode stops, we get what we want:
{noformat}
hadoop# bin/hdfs --daemon stop datanode
hadoop# bin/hdfs datanode -h
Usage: hdfs datanode [-regular | -rollback | -rollingupgrade rollback ]
-regular : Normal DataNode startup (default).
...
{noformat}
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