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https://issues.apache.org/jira/browse/HBASE-2243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12970028#action_12970028
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Kannan Muthukkaruppan commented on HBASE-2243:
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Ran into this in 0.89 just yesterday.
Turned out to be because countRegionsOnFS() relied on TableDirFilter() which is
supposed to ignore all non-table directories. It was ignoring the .logs
directory but not .oldlogs directory. As a result, the Regions on FS count
could be reported as higher than the actual value.
But in the latest code base (as part of the new master rewrite commit I think),
the web ui no longer displays Regions on FS metric. The countRegionsOnFS()
function also no longer exists in the code base. So this issue no longer
applies.
> Regions on FS metric almost always inflated
> -------------------------------------------
>
> Key: HBASE-2243
> URL: https://issues.apache.org/jira/browse/HBASE-2243
> Project: HBase
> Issue Type: Bug
> Reporter: Jean-Daniel Cryans
> Priority: Minor
> Fix For: 0.92.0
>
>
> The Regions on FS metric is almost always bigger than the real number of
> regions, it means we somehow not always clean region directories and they
> pile up. I guess it shouldn't be too hard spending some time loading a system
> until it gets wrong and then see why.
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