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https://issues.apache.org/jira/browse/HBASE-22386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16839535#comment-16839535
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Josh Elser commented on HBASE-22386:
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{quote}treeWriteLock will check all the way up and down the tree for locks
{quote}
I'm a little fuzzy about what is actually necessary to implement this
safely/correctly. We just want to make sure that we don't have two threads
trying to concurrently create the same file/directory, right?
Let me pull this down and run it through the unit tests.
> HBOSS: Limit depth that listing locks check for other locks
> -----------------------------------------------------------
>
> Key: HBASE-22386
> URL: https://issues.apache.org/jira/browse/HBASE-22386
> Project: HBase
> Issue Type: Bug
> Reporter: Sean Mackrory
> Assignee: Sean Mackrory
> Priority: Major
> Attachments: HBASE-22386.001.patch, HBASE-22386.002.patch
>
>
> treeWriteLock will check all the way up and down the tree for locks. This is
> more aggressive than it needs to be, and integration testing has shown that
> there's significant contention when listing tables, and this is one of
> numerous operations that doesn't need to recursively lock the whole subtree.
> There's actually a number of operations that only need to lock up or down 1
> level only, so let's start with listing: non-recursive listings don't need to
> care about what's going on more than 1 level below them.
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