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https://issues.apache.org/jira/browse/HDFS-14726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16905568#comment-16905568
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Chen Liang commented on HDFS-14726:
-----------------------------------
Marked as blocker as we should solve this before 2.10 release so 2.10 NN and JN
stays compatible with older versions.
> Fix JN incompatibility issue in branch-2 due to backport of HDFS-10519
> ----------------------------------------------------------------------
>
> Key: HDFS-14726
> URL: https://issues.apache.org/jira/browse/HDFS-14726
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: journal-node
> Affects Versions: 2.10.0
> Reporter: Chen Liang
> Assignee: Chen Liang
> Priority: Blocker
>
> HDFS-10519 has been backported to branch-2. However HDFS-10519 introduced an
> incompatibility issue between NN and JN due to the new protobuf field
> {{committedTxnId}} in {{HdfsServer.proto}}. This field was introduced as a
> required field so if JN and NN are not on same version, it will run into
> missing field exception. Although currently we can get around by making sure
> JN always gets upgraded properly before NN, we can potentially fix this
> incompatibility by changing the field to optional.
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