dannytbecker commented on code in PR #6018:
URL: https://github.com/apache/hadoop/pull/6018#discussion_r1319177733
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hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/BootstrapStandby.java:
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@@ -405,8 +423,14 @@ private boolean checkLogsAvailableForRead(FSImage image,
long imageTxId,
}
}
- private boolean checkLayoutVersion(NamespaceInfo nsInfo) throws IOException {
- return (nsInfo.getLayoutVersion() ==
HdfsServerConstants.NAMENODE_LAYOUT_VERSION);
+ private boolean checkLayoutVersion(NamespaceInfo nsInfo, boolean
isRollingUpgrade) {
+ if (isRollingUpgrade) {
+ // During a rolling upgrade the service layout versions may be different,
+ // but we should check that the layout version being sent is compatible
+ return nsInfo.getLayoutVersion() <=
+ HdfsServerConstants.MINIMUM_COMPATIBLE_NAMENODE_LAYOUT_VERSION;
Review Comment:
The version numbers are negative so the
`HdfsServerConstants.MINIMUM_COMPATIBLE_NAMENODE_LAYOUT_VERSION` is -61. We
want the nsInfo's layout version to be a "higher" version than the minimum
which is -61. So we need to use `<=` because a "higher" version is a lower
negative like -67.
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