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From "Eric Badger (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11207) Unnecessary incompatible change of NNHAStatusHeartbeat.state in DatanodeProtocolProtos
Date Mon, 05 Dec 2016 22:09:58 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11207?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eric Badger updated HDFS-11207:
-------------------------------
    Attachment: HDFS-11207.001.patch

Attaching a patch that adds a new field to the enum, but won't change the functionality of
the old fields. This will still break the datanodes if they are not equipped to handle the
{{INITIALIZING}} state.

> Unnecessary incompatible change of NNHAStatusHeartbeat.state in DatanodeProtocolProtos
> --------------------------------------------------------------------------------------
>
>                 Key: HDFS-11207
>                 URL: https://issues.apache.org/jira/browse/HDFS-11207
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Eric Badger
>            Assignee: Eric Badger
>         Attachments: HDFS-11207.001.patch
>
>
> HDFS-5079 changed the meaning of state in {{NNHAStatusHeartbeat}} when it added in the
{{INITIALIZING}} state via {{HAServiceStateProto}}.
> Before change:
> {noformat}
> enum State {
>    ACTIVE = 0;
>    STANDBY = 1;
> }
> {noformat}
> After change:
> {noformat}
> enum HAServiceStateProto {
>   INITIALIZING = 0;
>   ACTIVE = 1;
>   STANDBY = 2;
> }
> {noformat}
> So the new {{INITIALIZING}} state will be interpreted as {{ACTIVE}}, new {{ACTIVE}} interpreted
as {{STANDBY}} and new {{STANDBY}} interpreted as unknown. Any rolling upgrade to 3.0.0 will
break because the datanodes that haven't been updated will misinterpret the NN state. 



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