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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HBASE-2429) [EC2] document how to set up elastic load balancing across Stargate instances
Date Thu, 13 May 2010 22:15:43 GMT

     [ https://issues.apache.org/jira/browse/HBASE-2429?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrew Purtell resolved HBASE-2429.
-----------------------------------

    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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