[jira] [Created] (HDFS-12503) Ozone: some UX improvements to oz_debug

["Weiwei Yang (JIRA)" <ji...@apache.org>]

Weiwei Yang created HDFS-12503:
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             Summary: Ozone: some UX improvements to oz_debug
                 Key: HDFS-12503
                 URL: https://issues.apache.org/jira/browse/HDFS-12503
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: ozone
            Reporter: Weiwei Yang
            Assignee: Weiwei Yang


I tried to use {{oz_debug}} to dump KSM DB for offline analysis, found a few problems need to be fixed in order to make this tool easier to use. I know this is a debug tool for admins, but it's still necessary to improve the UX so new users (like me) can figure out how to use it without reading more docs.

# Support *--help* argument. --help is the general arg for all hdfs scripts to print usage.
# When specify output path {{-o}}, we need to add a description to let user know the path needs to be a file (instead of a dir). If the path is specified as a dir, it will end up with a funny error {{unable to open the database file (out of memory)}}, which is pretty misleading. And it will be helpful to add a check to make sure the specified path is not an existing dir.
# SQLCLI currently swallows exception
# We should remove {{levelDB}} words from the command output as we are by default using rocksDB



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