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https://issues.apache.org/jira/browse/HBASE-14827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15010048#comment-15010048
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Andrew Purtell commented on HBASE-14827:
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bq. We should have deprecated them when stateless scanners were added, in
retrospect.
See HBASE-14828 for
> Potential memory leak on REST server if state-full scanner is not deleted
> -------------------------------------------------------------------------
>
> Key: HBASE-14827
> URL: https://issues.apache.org/jira/browse/HBASE-14827
> Project: HBase
> Issue Type: Bug
> Reporter: Duo Xu
>
> Currently when people are using REST APIs to create state-full scanner, do
> scan with scanner id and delete scanner. However, if the clients never call
> delete scanner or if the clients are on cloud VMs and VMs get reboot before
> delete requests are sent, the resources associated with the scanner will
> never be released on the REST server, "hbase.client.scanner.timeout.period"
> will release the resources on region server side though.
> So this will cause memory leak on REST server in some cases.
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