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https://issues.apache.org/jira/browse/HBASE-3852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13054565#comment-13054565
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Ted Yu commented on HBASE-3852:
-------------------------------

I was thinking about timeout-driven expiration policy.
SU's implementation looks nice. We can introduce a new parameter (sigh) to 
control whether ScannerCleaner is instantiated at startup.

@J-D: do you happen to know how many scanners were closed by ScannerCleaner in 
the past month ?

> ThriftServer leaks scanners
> ---------------------------
>
>                 Key: HBASE-3852
>                 URL: https://issues.apache.org/jira/browse/HBASE-3852
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.90.2
>            Reporter: Jean-Daniel Cryans
>            Assignee: Ted Yu
>            Priority: Critical
>             Fix For: 0.92.0
>
>         Attachments: 3852.txt
>
>
> The scannerMap in ThriftServer relies on the user to clean it by closing the 
> scanner. If that doesn't happen, the ResultScanner will stay in the thrift 
> server's memory and if any pre-fetching was done, it will also start 
> accumulating Results (with all their data).

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