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https://issues.apache.org/jira/browse/YARN-2765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14187987#comment-14187987
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Zhijie Shen commented on YARN-2765:
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[~jlowe], the leveldb should be a good choice over local file system in terms
of the merits mentioned in the description. One drawback I can think of is that
while LeveldbRMStateStore is lightweight for single RM restarting, multiple RMs
of HA are not able to share this single-host database. Correct me if I'm wrong.
BTW, I saw you also have other Jira for JHS using leveldb. Did you have a
chance to think of an enhanced k/v db: rocksdb? I guess it will benefit the RM
case as well as the timeline case.
> Add leveldb-based implementation for RMStateStore
> -------------------------------------------------
>
> Key: YARN-2765
> URL: https://issues.apache.org/jira/browse/YARN-2765
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: resourcemanager
> Reporter: Jason Lowe
> Assignee: Jason Lowe
> Attachments: YARN-2765.patch
>
>
> It would be nice to have a leveldb option to the resourcemanager recovery
> store. Leveldb would provide some benefits over the existing filesystem store
> such as better support for atomic operations, fewer I/O ops per state update,
> and far fewer total files on the filesystem.
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