huangtianhua commented on a change in pull request #2377:
URL: https://github.com/apache/hadoop/pull/2377#discussion_r513209898
##########
File path:
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNodeLayoutVersion.java
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@@ -89,7 +89,8 @@ public static boolean supports(final LayoutFeature f, final
int lv) {
APPEND_NEW_BLOCK(-62, -61, "Support appending to new block"),
QUOTA_BY_STORAGE_TYPE(-63, -61, "Support quota for specific storage
types"),
ERASURE_CODING(-64, -61, "Support erasure coding"),
- EXPANDED_STRING_TABLE(-65, -61, "Support expanded string table in
fsimage");
+ EXPANDED_STRING_TABLE(-65, -61, "Support expanded string table in
fsimage"),
+ NVDIMM_SUPPORT(-66, -66, "Support NVDIMM storage type");
Review comment:
As the comment above said:
If the feature cannot satisfy compatibility with any prior version,
then set its minimum compatible lqyout version to itself to indicate that
downgrade is impossible.
Or maybe we missed something?
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