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https://issues.apache.org/jira/browse/CASSANDRA-5719?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Brown updated CASSANDRA-5719:
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Description: 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. (was: 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. 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.)
> 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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