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https://issues.apache.org/jira/browse/HDFS-7748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14370128#comment-14370128
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Haohui Mai commented on HDFS-7748:
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bq. Shall we keep the same values here in the new protobuf enum
Yes. Please keep the enum matching the RFC.
{code}
+ optional ECN ecn = 4 ;
{code}
Let's rename the field into {{header}} and make it a {{int64}} field. That way
allows us to add more information in the future while maintaining both backward
and forward compatibility.
> 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-7748.001.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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