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https://issues.apache.org/jira/browse/HDFS-16038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17354202#comment-17354202
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Jinglun commented on HDFS-16038:
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I mean you can update the package and the configuration at the same time. The
DataNode with old package doesn't know the existence of the Observer. So there
won't be the HAServiceState.observer issue.
Would you like to share more details about your upgrade progress and why update
the package and the configuration at the same time doesn't work for you ?
> 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 DataNode：
> {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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