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https://issues.apache.org/jira/browse/HDFS-16038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17353945#comment-17353945
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Jinglun commented on HDFS-16038:
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Hi [~lei w], thans for your report. I have one question.
IMO, when the observer is added to the cluster, the Datanode won't
automatically recognize it. The administrator needs to update both the
configuration and the package of the DataNode so the it can recognize the
address of the observer and the `HAServiceState.observer`. If we update both
the configuration and the package we won't run into the situation that the
DataNode doesn't recognize the HAServiceState.observer.
> DataNode Unrecognized Observer Node when cluster add an observer node
> ---------------------------------------------------------------------
>
> Key: HDFS-16038
> URL: https://issues.apache.org/jira/browse/HDFS-16038
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: lei w
> Priority: Critical
>
> When an Observer node is added to the cluster, the DataNode will not be able
> to recognize the HAServiceState.observer, This is because we did not upgrade
> the DataNode. Generally, it will take a long time for a big cluster to
> upgrade the DataNode . So should we add a switch to replace the Observer
> state with the Standby state when DataNode can not recognize the
> HAServiceState.observer state?
> The following are some error messages of DataNodeļ¼
> {code:java}
> 11:14:31,812 WARN org.apache.hadoop.hdfs.server.datanode.DataNode:
> IOException in offerService
> com.google.protobuf.InvalidProtocolBufferException: Message missing required
> fields: haStatus.state
> at
> com.google.protobuf.UninitializedMessageException.asInvalidProtocolBufferException(UninitializedMessageException.java:81)
> at
> com.google.protobuf.AbstractParser.checkMessageInitialized(AbstractParser.java:71)
> {code}
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