Andrew Wang updated HDFS-10877:
    Hadoop Flags: Incompatible change
    Release Note: A new protobuf field added to RemoteEditLogManifest was 
mistakenly marked as required. This changes the field to optional, preserving 
compatibility with 2.x releases but breaking compatibility with 3.0.0-alpha1.

> Make RemoteEditLogManifest.committedTxnId optional in Protocol Buffers
> ----------------------------------------------------------------------
>                 Key: HDFS-10877
>                 URL: https://issues.apache.org/jira/browse/HDFS-10877
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: qjm
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Sean Mackrory
>            Assignee: Sean Mackrory
>             Fix For: 3.0.0-alpha2
>         Attachments: HDFS-10877.001.patch, HDFS-10877.002.patch
> HDFS-10519 introduced a new field in the RemoteEditLogManifest message. It 
> can be made optional to improve wire-compatibility with previous versions.

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