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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14827) Potential memory leak on REST server if state-full scanner is not deleted
Date Tue, 17 Nov 2015 23:43:11 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15009852#comment-15009852
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Enis Soztutar commented on HBASE-14827:
---------------------------------------

We need the leases mechanism in the REST scan resources as well. 

One open question is given stateless scanners, should statefull scanners be deprecated and
removed or not? 


> 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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