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From "Jason Brown (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5719) Expire entries out of ThriftSessionManager
Date Tue, 02 Jul 2013 19:15:20 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5719?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13698114#comment-13698114
] 

Jason Brown commented on CASSANDRA-5719:
----------------------------------------

Yes, it does affect 1.1 - that's how I made this observation :). Looks like 1.1 had SocketSessionManagementService,
which more or less became TSM in 1.2. However, I thought we weren't patching 1.1 anymore,
so I didn't bother creating a patch for it.
                
> Expire entries out of ThriftSessionManager
> ------------------------------------------
>
>                 Key: CASSANDRA-5719
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5719
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 1.2.0
>            Reporter: Jason Brown
>            Assignee: Jason Brown
>            Priority: Minor
>              Labels: cache, thrift
>             Fix For: 1.2.7, 2.0 beta 1
>
>         Attachments: 5719-v1.patch
>
>
> TSM maintains a map of SocketAddress (IpAddr, and the ephemeral port) to ClientState.
If the connection goes away, for whatever reason, entries are not removed from the map. In
most cases this is a tiny leakage. However, at Netflix, we auto-scale services up and down
everyday, sometimes with client instance lifetimes of around 36 hours. These clusters can
add hundreds of servers at peak time, and indescriminantly terminate them at the trough. Thus,
those Ip addresses are never coming back (for us). The net effect for cassandra is that we'll
leave thousands of dead entries in the TSM.activeSocketSessions map. When I looked at an instance
in a well-used cluster yesterday, there were almost 400,000 entries in the map.

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