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https://issues.apache.org/jira/browse/HDFS-892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12853713#action_12853713
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Doug Cutting commented on HDFS-892:
-----------------------------------

> If you require it at compile time, why bother with making it optional at run 
> time?

What I meant by "optional" and "not at runtime" is that it's switched off by 
default.  The strategy is, rather than trying to maintain a long-lived branch, 
to incrementally develop this in trunk but leave it switched off until it's 
been extensively tested, benchmarked, etc.

> optionally use Avro for namenode RPC
> ------------------------------------
>
>                 Key: HDFS-892
>                 URL: https://issues.apache.org/jira/browse/HDFS-892
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>            Reporter: Doug Cutting
>            Assignee: Doug Cutting
>             Fix For: 0.22.0
>
>         Attachments: HDFS-892.patch, HDFS-892.patch, HDFS-892.patch, 
> HDFS-892.patch, HDFS-892.patch, HDFS-892.patch
>
>
> It should be possible to configure HDFS so that Avro is used for RPCs to the 
> namenode.

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