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https://issues.apache.org/jira/browse/HDFS-16038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17354233#comment-17354233
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lei w commented on HDFS-16038:
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hi [~LiJinglun] ,Thanks for your comment. Update the package and the
configuration at the same time is a solution but it will take a long time. If
we add a switch at namenode to replace the Observer state with the Standby
state during Observer Node handle the DataNode heartbeat will solve this
problem.
> 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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