Update HISTORY.md for 11.2.2

Summary:
- Reapply c4941760c9 so remote compaction serializes InternalStats::CompactionStats::counts with the pre-11.2 compaction-reason count.
- Keep remote compaction result metadata compatible with 11.1 readers and writers until the stats serialization path has version-aware array handling.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/14712

Test Plan:
- make format-auto
- make -j$(sysctl -n hw.ncpu) compaction_job_test compaction_service_test
- /usr/local/bin/timeout 60 ./compaction_job_test --gtest_filter=CompactionJobTest.ResultSerialization
- /usr/local/bin/timeout 60 ./compaction_service_test --gtest_filter=CompactionServiceTest.VerifyStats

Reviewed By: joshkang97, jaykorean

Differential Revision: D104130456

Pulled By: xingbowang

fbshipit-source-id: e9e92cb044253edbec0fc79b92c3efff53f01d8b

HISTORY.md

@@ -1,6 +1,7 @@
 # Rocksdb Change Log
 > NOTE: Entries for next release do not go here. Follow instructions in `unreleased_history/README.txt`
 
+## 11.2.2 (05/07/2026)
 ## 11.2.1 (04/29/2026)
 ### Bug Fixes
 * Fix bug in range tombstone synthesis that covers live keys added during an IngestExternalFile

db/compaction/compaction_service_job.cc

@@ -846,11 +846,16 @@ static std::unordered_map<std::string, OptionTypeInfo>
          {offsetof(struct InternalStats::CompactionStats, count),
           OptionType::kUInt64T, OptionVerificationType::kNormal,
           OptionTypeFlags::kNone}},
-        {"counts", OptionTypeInfo::Array<
-                       int, static_cast<int>(CompactionReason::kNumOfReasons)>(
-                       offsetof(struct InternalStats::CompactionStats, counts),
-                       OptionVerificationType::kNormal, OptionTypeFlags::kNone,
-                       {0, OptionType::kInt})},
+        {"counts",
+         OptionTypeInfo::Array<
+             /* In release 11.2, a new compaction reason was added. This broken
+              * the reader and writer. To unblock release 11.1, we temporarily
+              * reduce the count array size to the old one. TODO add a proper
+              * serialization and deserialization method. */
+             int, static_cast<int>(CompactionReason::kNumOfReasons) - 1>(
+             offsetof(struct InternalStats::CompactionStats, counts),
+             OptionVerificationType::kNormal, OptionTypeFlags::kNone,
+             {0, OptionType::kInt})},
 };
 
 static std::unordered_map<std::string, OptionTypeInfo>

include/rocksdb/version.h

@@ -13,7 +13,7 @@
 // minor or major version number planned for release.
 #define ROCKSDB_MAJOR 11
 #define ROCKSDB_MINOR 2
-#define ROCKSDB_PATCH 1
+#define ROCKSDB_PATCH 2
 
 // Make it easy to do conditional compilation based on version checks, i.e.
 // #if ROCKSDB_VERSION_GE(4, 5, 6)