Chen Liang created HDFS-14726:
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Summary: 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
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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