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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12976) Introduce StandbyReadProxyProvider
Date Wed, 03 Jan 2018 22:36:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12976?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16310398#comment-16310398
] 

Konstantin Shvachko commented on HDFS-12976:
--------------------------------------------

Thanks for the link [~elgoiri]. Yes something similar to what you did for RBF, but we will
need more sophisticated logic than just random. The trade-offs I see:
* Switch over from active to standby could be expensive since the client should wait while
SBN catches up with its lastSeenId, so {{StandbyReadProxyProvider}} should be sticky once
it starts reading from SBN.
* But we also want load balancing so that the overall load is distributed evenly between nodes.

> Introduce StandbyReadProxyProvider
> ----------------------------------
>
>                 Key: HDFS-12976
>                 URL: https://issues.apache.org/jira/browse/HDFS-12976
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs-client
>            Reporter: Konstantin Shvachko
>
> {{StandbyReadProxyProvider}} should implement {{FailoverProxyProvider}} interface and
be able to submit read requests to ANN and SBN(s).



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