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From "Tyler Hobbs (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-5746) HHOM.countPendingHints is a trap for the unwary
Date Wed, 17 Jul 2013 21:21:47 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-5746?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tyler Hobbs updated CASSANDRA-5746:
-----------------------------------

    Attachment: 0002-Report-created-hint-count-by-endpoint.patch
                0001-Remove-HHOM.countPendingHints.patch

0001 removes countPendingHints().

0002 adds a per-endpoint count through the new metrics system. I made HHOM.hintFor() non-static,
as I couldn't see why the singleton couldn't be used.  Let me know if there was some motivation
for that.
                
> HHOM.countPendingHints is a trap for the unwary
> -----------------------------------------------
>
>                 Key: CASSANDRA-5746
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5746
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core, Tools
>            Reporter: Jonathan Ellis
>            Assignee: Tyler Hobbs
>             Fix For: 2.0 beta 2
>
>         Attachments: 0001-Remove-HHOM.countPendingHints.patch, 0002-Report-created-hint-count-by-endpoint.patch
>
>
> countPendingHints can OOM the server fairly easily since it does a per-target seq scan
without paging.
> More generally, countPendingHints is far too slow to be useful for routine monitoring.

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