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https://issues.apache.org/jira/browse/HDFS-12503?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16173978#comment-16173978
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Weiwei Yang commented on HDFS-12503:
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With this patch, now user could get more help message while using the tool,
{code}
bin/hdfs oz_debug --help
usage: hdfs oz_debug -p <DB path> -o <Output DB file path>
-h,--help display help message
-o,--outPath <output path> specify output DB file path
-p,--dbPath <DB path> specify DB path
{code}
Also modified description of {{outPath}} to make it more accurate, I have also
added a check to make sure {{outPath}} is valid. Please kindly review, thanks.
> 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
> Attachments: HDFS-12503-HDFS-7240.001.patch,
> HDFS-12503-HDFS-7240.002.patch
>
>
> 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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