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Date: Tue, 8 May 2012 06:18:44 +0000 (UTC)
From: "stack (JIRA)" <jira@apache.org>
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Subject: [jira] [Updated] (HBASE-5877) When a query fails because the region
 has moved, let the regionserver return the new address to the client
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     [ https://issues.apache.org/jira/browse/HBASE-5877?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

stack updated HBASE-5877:
-------------------------

    Status: Patch Available  (was: Open)
    
> When a query fails because the region has moved, let the regionserver return the new address to the client
> ----------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-5877
>                 URL: https://issues.apache.org/jira/browse/HBASE-5877
>             Project: HBase
>          Issue Type: Improvement
>          Components: client, master, regionserver
>    Affects Versions: 0.96.0
>            Reporter: nkeywal
>            Assignee: nkeywal
>            Priority: Minor
>             Fix For: 0.96.0
>
>         Attachments: 5877-v16.txt, 5877-v17.txt, 5877-v17.txt, 5877.v1.patch, 5877.v12.patch, 5877.v15.patch, 5877.v6.patch
>
>
> This is mainly useful when we do a rolling restart. This will decrease the load on the master and the network load.
> Note that a region is not immediately opened after a close. So:
> - it seems preferable to wait before retrying on the other server. An optimisation would be to have an heuristic depending on when the region was closed.
> - during a rolling restart, the server moves the regions then stops. So we may have failures when the server is stopped, and this patch won't help.
> The implementation in the first patch does:
> - on the region move, there is an added parameter on the regionserver#close to say where we are sending the region
> - the regionserver keeps a list of what was moved. Each entry is kept 100 seconds.
> - the regionserver sends a specific exception when it receives a query on a moved region. This exception contains the new address.
> - the client analyses the exeptions and update its cache accordingly...

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