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https://issues.apache.org/jira/browse/HBASE-5973?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated HBASE-5973:
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Attachment: hbase-5973.txt
Attached patch fixes the copyright. I'll commit this to the branches where it
applies, and leave it open. Dave Wang is working on backports for some earlier
branches as well.
> Add ability for potentially long-running IPC calls to abort if client
> disconnects
> ---------------------------------------------------------------------------------
>
> Key: HBASE-5973
> URL: https://issues.apache.org/jira/browse/HBASE-5973
> Project: HBase
> Issue Type: Improvement
> Components: ipc
> Affects Versions: 0.90.7, 0.92.1, 0.94.0, 0.96.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: hbase-5973.txt, hbase-5973.txt, hbase-5973.txt
>
>
> We recently had a cluster issue where a user was submitting scanners with a
> very restrictive filter, and then calling next() with a high scanner caching
> value. The clients would generally time out the next() call and disconnect,
> but the IPC kept running looking to fill the requested number of rows. Since
> this was in the context of MR, the tasks making the calls would retry, and
> the retries wuld be more likely to time out due to contention with the
> previous still-running scanner next() call. Eventually, the system spiraled
> out of control.
> We should add a hook to the IPC system so that RPC calls can check if the
> client has already disconnected. In such a case, the next() call could abort
> processing, given any further work is wasted. I imagine coprocessor
> endpoints, etc, could make good use of this as well.
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