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https://issues.apache.org/jira/browse/HDFS-11283?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arpit Agarwal resolved HDFS-11283.
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Resolution: Fixed
Hi [~chenrongwei], the hdfs-dev mailing list is the right place for these
questions. Resolving this.
> why should we not introduce distributed database to storage hdfs's metadata?
> -----------------------------------------------------------------------------
>
> Key: HDFS-11283
> URL: https://issues.apache.org/jira/browse/HDFS-11283
> Project: Hadoop HDFS
> Issue Type: Wish
> Reporter: chenrongwei
>
> why should we not introduce distributed database to storage hdfs's metadata?
> In my opinion,it maybe loss some performance,but it has below improvements:
> 1、enhance NN's extend ability,such as NN can support much more files and
> blocks. The problem of massive little files always make me headache.
> 2、In most MR cluster aren't care the performance loss,but more care the
> cluster's scale.
> 3、NN's HA implements maybe more simpler and reasonable.
> so I think maybe we should add a new work mode building on distributed
> database for NN.
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