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https://issues.apache.org/jira/browse/HBASE-2429?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Purtell resolved HBASE-2429.
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Resolution: Not A Problem
Closed per HBASE-2543.
> [EC2] document how to set up elastic load balancing across Stargate instances
> -----------------------------------------------------------------------------
>
> Key: HBASE-2429
> URL: https://issues.apache.org/jira/browse/HBASE-2429
> Project: Hadoop HBase
> Issue Type: Sub-task
> Reporter: Andrew Purtell
> Priority: Minor
>
> Previously ELB across Stargate instances was made difficult (impractical?)
> because scanner state is not distributed among Stargate instances. I thought
> about making scanner state serializable and have multiple stargate instances
> retrieve and sync scanner cursors up in Zookeeper but obviously that is
> problematic for several reasons:
> - Performance
> - ZK write loading
> - As a basic matter of architecture scanners are not meant to be concurrent
> across multiple clients
> - The prospect seemed a lot of work
> Anyway, today AWS announced ELB now incorporates session affinity:
>
> http://aws.typepad.com/aws/2010/04/new-elastic-load-balancing-feature-sticky-sessions.html
>
> http://docs.amazonwebservices.com/ElasticLoadBalancing/latest/DeveloperGuide/index.html?US_EnableStickySessionsLBCookies.html
> So unless there is a failure of the Stargate instance (invaliding the
> scanner, but the client can restart on that rare error) ELB will
> transparently use cookies to maintain a session between a client and the
> Stargate instance, enabling proper function of scanners without further work.
> Document this.
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