[jira] [Created] (HDFS-16270) Improve NNThroughputBenchmark#printUsage() related to block size

["JiangHua Zhu (Jira)" <ji...@apache.org>]

JiangHua Zhu created HDFS-16270:
-----------------------------------

             Summary: Improve NNThroughputBenchmark#printUsage() related to block size
                 Key: HDFS-16270
                 URL: https://issues.apache.org/jira/browse/HDFS-16270
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: JiangHua Zhu


When using the NNThroughputBenchmark test, if the usage is not correct, we will get some prompt messages.
E.g:
'
If connecting to a remote NameNode with -fs option, dfs.namenode.fs-limits.min-block-size should be set to 16.
21/10/13 11:55:32 INFO util.ExitUtil: Exiting with status -1: ExitException
'
Yes, this way is good.
However, the setting of'dfs.blocksize' has been completed before execution, for example:
conf.setInt(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, 16);
We will still get the above prompt, which is wrong.

At the same time, it should also be explained. The hint here should not be for'dfs.namenode.fs-limits.min-block-size', but should be'dfs.blocksize'.
Because in the NNThroughputBenchmark construction, the'dfs.namenode.fs-limits.min-block-size' has been set to 0 in advance.



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