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From "Haohui Mai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7748) Separate ECN flags from the Status in the DataTransferPipelineAck
Date Fri, 27 Mar 2015 23:49:53 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14384909#comment-14384909
] 

Haohui Mai commented on HDFS-7748:
----------------------------------

I take a quick crack based on Anu's work. The only significant difference is that the code
combines the bits into the flags which result in better encoding efficiency in protobuf (2
bytes per flags vs. 5bytes). [~anu], does it look good to you?

> Separate ECN flags from the Status in the DataTransferPipelineAck
> -----------------------------------------------------------------
>
>                 Key: HDFS-7748
>                 URL: https://issues.apache.org/jira/browse/HDFS-7748
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Haohui Mai
>            Assignee: Anu Engineer
>            Priority: Blocker
>         Attachments: HDFS-7748.007.patch, hdfs-7748.001.patch, hdfs-7748.002.patch, hdfs-7748.003.patch,
hdfs-7748.004.patch, hdfs-7748.005.patch, hdfs-7748.006.patch, hdfs-7748.branch-2.7.006.patch
>
>
> Prior to the discussions on HDFS-7270, the old clients might fail to talk to the newer
server when ECN is turned on. This jira proposes to separate the ECN flags in a separate protobuf
field to make the ack compatible on both versions.



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