Add commit marker with timestamp (#9266)

Summary:
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9266

This diff adds a new tag `CommitWithTimestamp`. Currently, there is no API to trigger writing
this tag to WAL, thus it is unavailable to users.
This is an ongoing effort to add user-defined timestamp support to write-committed transactions.
This diff also indicates all column families that may potentially participate in the same
transaction must either disable timestamp or have the same timestamp format, since
`CommitWithTimestamp` tag is followed by a single byte-array denoting the commit
timestamp of the transaction. We will enforce this checking in a future diff. We keep this
diff small.

Reviewed By: ltamasi

Differential Revision: D31721350

fbshipit-source-id: e1450811443647feb6ca01adec4c8aaae270ffc6

HISTORY.md

@@ -1,6 +1,8 @@
 # Rocksdb Change Log
 ## Unreleased
 ### New Features
+* Introduced 'CommitWithTimestamp' as a new tag. Currently, there is no API for user to trigger a write with this tag to the WAL. This is part of the efforts to support write-commited transactions with user-defined timestamps.
+
 ### Bug Fixes
 * Fixed a bug in rocksdb automatic implicit prefetching which got broken because of new feature adaptive_readahead and internal prefetching got disabled when iterator moves from one file to next.
 * Fixed a bug in TableOptions.prepopulate_block_cache which causes segmentation fault when used with TableOptions.partition_filters = true and TableOptions.cache_index_and_filter_blocks = true.

db/blob/db_blob_compaction_test.cc

@@ -18,7 +18,7 @@ class DBBlobCompactionTest : public DBTestBase {
 
 #ifndef ROCKSDB_LITE
   const std::vector<InternalStats::CompactionStats>& GetCompactionStats() {
-    VersionSet* const versions = dbfull()->TEST_GetVersionSet();
+    VersionSet* const versions = dbfull()->GetVersionSet();
     assert(versions);
     assert(versions->GetColumnFamilySet());
 
@@ -495,7 +495,7 @@ TEST_F(DBBlobCompactionTest, TrackGarbage) {
 
   ASSERT_OK(db_->CompactRange(CompactRangeOptions(), begin, end));
 
-  VersionSet* const versions = dbfull()->TEST_GetVersionSet();
+  VersionSet* const versions = dbfull()->GetVersionSet();
   assert(versions);
   assert(versions->GetColumnFamilySet());
 

db/db_basic_test.cc

@@ -2565,7 +2565,7 @@ TEST_F(DBBasicTest, DisableTrackWal) {
   ASSERT_OK(dbfull()->TEST_SwitchMemtable());
   ASSERT_OK(db_->SyncWAL());
   // Some WALs are tracked.
-  ASSERT_FALSE(dbfull()->TEST_GetVersionSet()->GetWalSet().GetWals().empty());
+  ASSERT_FALSE(dbfull()->GetVersionSet()->GetWalSet().GetWals().empty());
   Close();
 
   // Disable WAL tracking.
@@ -2573,14 +2573,14 @@ TEST_F(DBBasicTest, DisableTrackWal) {
   options.create_if_missing = false;
   ASSERT_OK(TryReopen(options));
   // Previously tracked WALs are cleared.
-  ASSERT_TRUE(dbfull()->TEST_GetVersionSet()->GetWalSet().GetWals().empty());
+  ASSERT_TRUE(dbfull()->GetVersionSet()->GetWalSet().GetWals().empty());
   Close();
 
   // Re-enable WAL tracking again.
   options.track_and_verify_wals_in_manifest = true;
   options.create_if_missing = false;
   ASSERT_OK(TryReopen(options));
-  ASSERT_TRUE(dbfull()->TEST_GetVersionSet()->GetWalSet().GetWals().empty());
+  ASSERT_TRUE(dbfull()->GetVersionSet()->GetWalSet().GetWals().empty());
   Close();
 }
 #endif  // !ROCKSDB_LITE

db/db_compaction_test.cc

@@ -6127,7 +6127,7 @@ TEST_F(DBCompactionTest, CompactionWithBlob) {
   ASSERT_EQ(Get(first_key), third_value);
   ASSERT_EQ(Get(second_key), third_value);
 
-  VersionSet* const versions = dbfull()->TEST_GetVersionSet();
+  VersionSet* const versions = dbfull()->GetVersionSet();
   assert(versions);
 
   ColumnFamilyData* const cfd = versions->GetColumnFamilySet()->GetDefault();
@@ -6230,7 +6230,7 @@ TEST_P(DBCompactionTestBlobError, CompactionError) {
   SyncPoint::GetInstance()->DisableProcessing();
   SyncPoint::GetInstance()->ClearAllCallBacks();
 
-  VersionSet* const versions = dbfull()->TEST_GetVersionSet();
+  VersionSet* const versions = dbfull()->GetVersionSet();
   assert(versions);
 
   ColumnFamilyData* const cfd = versions->GetColumnFamilySet()->GetDefault();
@@ -6352,7 +6352,7 @@ TEST_P(DBCompactionTestBlobGC, CompactionWithBlobGC) {
     ASSERT_EQ(new_blob_files[i - cutoff_index], original_blob_files[i]);
   }
 
-  VersionSet* const versions = dbfull()->TEST_GetVersionSet();
+  VersionSet* const versions = dbfull()->GetVersionSet();
   assert(versions);
   assert(versions->GetColumnFamilySet());
 

db/db_flush_test.cc

@@ -1608,7 +1608,7 @@ TEST_F(DBFlushTest, FlushWithBlob) {
   ASSERT_EQ(Get("key1"), short_value);
   ASSERT_EQ(Get("key2"), long_value);
 
-  VersionSet* const versions = dbfull()->TEST_GetVersionSet();
+  VersionSet* const versions = dbfull()->GetVersionSet();
   assert(versions);
 
   ColumnFamilyData* const cfd = versions->GetColumnFamilySet()->GetDefault();
@@ -1938,7 +1938,7 @@ TEST_P(DBFlushTestBlobError, FlushError) {
   SyncPoint::GetInstance()->DisableProcessing();
   SyncPoint::GetInstance()->ClearAllCallBacks();
 
-  VersionSet* const versions = dbfull()->TEST_GetVersionSet();
+  VersionSet* const versions = dbfull()->GetVersionSet();
   assert(versions);
 
   ColumnFamilyData* const cfd = versions->GetColumnFamilySet()->GetDefault();
@@ -2149,7 +2149,7 @@ TEST_P(DBAtomicFlushTest, PrecomputeMinLogNumberToKeepNon2PC) {
     flush_edits.push_back({});
     auto unflushed_cfh = static_cast<ColumnFamilyHandleImpl*>(handles_[1]);
 
-    ASSERT_EQ(PrecomputeMinLogNumberToKeepNon2PC(dbfull()->TEST_GetVersionSet(),
+    ASSERT_EQ(PrecomputeMinLogNumberToKeepNon2PC(dbfull()->GetVersionSet(),
                                                  flushed_cfds, flush_edits),
               unflushed_cfh->cfd()->GetLogNumber());
   }
@@ -2174,7 +2174,7 @@ TEST_P(DBAtomicFlushTest, PrecomputeMinLogNumberToKeepNon2PC) {
           std::min(min_log_number_to_keep, cfh->cfd()->GetLogNumber());
     }
     ASSERT_EQ(min_log_number_to_keep, log_num_after_flush);
-    ASSERT_EQ(PrecomputeMinLogNumberToKeepNon2PC(dbfull()->TEST_GetVersionSet(),
+    ASSERT_EQ(PrecomputeMinLogNumberToKeepNon2PC(dbfull()->GetVersionSet(),
                                                  flushed_cfds, flush_edits),
               min_log_number_to_keep);
   }

db/db_impl/db_impl.h

@@ -942,6 +942,8 @@ class DBImpl : public DB {
                                      int max_entries_to_print,
                                      std::string* out_str);
 
+  VersionSet* GetVersionSet() const { return versions_.get(); }
+
 #ifndef NDEBUG
   // Compact any files in the named level that overlap [*begin, *end]
   Status TEST_CompactRange(int level, const Slice* begin, const Slice* end,
@@ -1049,8 +1051,6 @@ class DBImpl : public DB {
   void TEST_WaitForStatsDumpRun(std::function<void()> callback) const;
   size_t TEST_EstimateInMemoryStatsHistorySize() const;
 
-  VersionSet* TEST_GetVersionSet() const { return versions_.get(); }
-
   uint64_t TEST_GetCurrentLogNumber() const {
     InstrumentedMutexLock l(mutex());
     assert(!logs_.empty());

db/db_impl/db_impl_secondary.h

@@ -290,6 +290,10 @@ class DBImplSecondary : public DBImpl {
 
     Status MarkCommit(const Slice&) override { return Status::OK(); }
 
+    Status MarkCommitWithTimestamp(const Slice&, const Slice&) override {
+      return Status::OK();
+    }
+
     Status MarkNoop(bool) override { return Status::OK(); }
 
     const std::unordered_set<uint32_t>& column_families() const {

db/db_test_util.cc

@@ -1130,7 +1130,7 @@ std::string DBTestBase::FilesPerLevel(int cf) {
 #endif  // !ROCKSDB_LITE
 
 std::vector<uint64_t> DBTestBase::GetBlobFileNumbers() {
-  VersionSet* const versions = dbfull()->TEST_GetVersionSet();
+  VersionSet* const versions = dbfull()->GetVersionSet();
   assert(versions);
 
   ColumnFamilyData* const cfd = versions->GetColumnFamilySet()->GetDefault();

db/db_wal_test.cc

@@ -382,7 +382,7 @@ TEST_F(DBWALTest, RecoverWithBlob) {
 
   // There should be no files just yet since we haven't flushed.
   {
-    VersionSet* const versions = dbfull()->TEST_GetVersionSet();
+    VersionSet* const versions = dbfull()->GetVersionSet();
     ASSERT_NE(versions, nullptr);
 
     ColumnFamilyData* const cfd = versions->GetColumnFamilySet()->GetDefault();
@@ -412,7 +412,7 @@ TEST_F(DBWALTest, RecoverWithBlob) {
   ASSERT_EQ(Get("key1"), short_value);
   ASSERT_EQ(Get("key2"), long_value);
 
-  VersionSet* const versions = dbfull()->TEST_GetVersionSet();
+  VersionSet* const versions = dbfull()->GetVersionSet();
   ASSERT_NE(versions, nullptr);
 
   ColumnFamilyData* const cfd = versions->GetColumnFamilySet()->GetDefault();
@@ -477,7 +477,7 @@ TEST_F(DBWALTest, RecoverWithBlobMultiSST) {
 
   // There should be no files just yet since we haven't flushed.
   {
-    VersionSet* const versions = dbfull()->TEST_GetVersionSet();
+    VersionSet* const versions = dbfull()->GetVersionSet();
     ASSERT_NE(versions, nullptr);
 
     ColumnFamilyData* const cfd = versions->GetColumnFamilySet()->GetDefault();
@@ -509,7 +509,7 @@ TEST_F(DBWALTest, RecoverWithBlobMultiSST) {
     ASSERT_EQ(Get(Key(i)), large_value);
   }
 
-  VersionSet* const versions = dbfull()->TEST_GetVersionSet();
+  VersionSet* const versions = dbfull()->GetVersionSet();
   ASSERT_NE(versions, nullptr);
 
   ColumnFamilyData* const cfd = versions->GetColumnFamilySet()->GetDefault();

db/dbformat.h

@@ -65,6 +65,7 @@ enum ValueType : unsigned char {
   // another.
   kTypeBeginUnprepareXID = 0x13,  // WAL only.
   kTypeDeletionWithTimestamp = 0x14,
+  kTypeCommitXIDAndTimestamp = 0x15,  // WAL only
   kMaxValue = 0x7F                    // Not used for storing records.
 };
 
@@ -654,7 +655,7 @@ extern bool ReadKeyFromWriteBatchEntry(Slice* input, Slice* key,
 
 // Read record from a write batch piece from input.
 // tag, column_family, key, value and blob are return values. Callers own the
-// Slice they point to.
+// slice they point to.
 // Tag is defined as ValueType.
 // input will be advanced to after the record.
 extern Status ReadRecordFromWriteBatch(Slice* input, char* tag,

db/listener_test.cc

@@ -1246,7 +1246,7 @@ class BlobDBJobLevelEventListenerTest : public EventListener {
   }
 
   const VersionStorageInfo::BlobFiles& GetBlobFiles() {
-    VersionSet* const versions = test_->dbfull()->TEST_GetVersionSet();
+    VersionSet* const versions = test_->dbfull()->GetVersionSet();
     assert(versions);
 
     ColumnFamilyData* const cfd = versions->GetColumnFamilySet()->GetDefault();

db/obsolete_files_test.cc

@@ -189,7 +189,7 @@ TEST_F(ObsoleteFilesTest, DeleteObsoleteOptionsFile) {
 TEST_F(ObsoleteFilesTest, BlobFiles) {
   ReopenDB();
 
-  VersionSet* const versions = dbfull()->TEST_GetVersionSet();
+  VersionSet* const versions = dbfull()->GetVersionSet();
   assert(versions);
   assert(versions->GetColumnFamilySet());
 

db/transaction_log_impl.cc

@@ -266,6 +266,10 @@ void TransactionLogIteratorImpl::UpdateCurrentWriteBatch(const Slice& record) {
       sequence_++;
       return Status::OK();
     }
+    Status MarkCommitWithTimestamp(const Slice&, const Slice&) override {
+      ++sequence_;
+      return Status::OK();
+    }
 
     Status PutCF(uint32_t /*cf*/, const Slice& /*key*/,
                  const Slice& /*val*/) override {

db/write_batch.cc

@@ -134,6 +134,11 @@ struct BatchContentClassifier : public WriteBatch::Handler {
     return Status::OK();
   }
 
+  Status MarkCommitWithTimestamp(const Slice&, const Slice&) override {
+    content_flags |= ContentFlags::HAS_COMMIT;
+    return Status::OK();
+  }
+
   Status MarkRollback(const Slice&) override {
     content_flags |= ContentFlags::HAS_ROLLBACK;
     return Status::OK();
@@ -416,6 +421,11 @@ Status ReadRecordFromWriteBatch(Slice* input, char* tag,
         return Status::Corruption("bad EndPrepare XID");
       }
       break;
+    case kTypeCommitXIDAndTimestamp:
+      if (!GetLengthPrefixedSlice(input, key)) {
+        return Status::Corruption("bad commit timestamp");
+      }
+      FALLTHROUGH_INTENDED;
     case kTypeCommitXID:
       if (!GetLengthPrefixedSlice(input, xid)) {
         return Status::Corruption("bad Commit XID");
@@ -625,6 +635,16 @@ Status WriteBatchInternal::Iterate(const WriteBatch* wb,
         assert(s.ok());
         empty_batch = true;
         break;
+      case kTypeCommitXIDAndTimestamp:
+        assert(wb->content_flags_.load(std::memory_order_relaxed) &
+               (ContentFlags::DEFERRED | ContentFlags::HAS_COMMIT));
+        // key stores the commit timestamp.
+        assert(!key.empty());
+        s = handler->MarkCommitWithTimestamp(xid, key);
+        if (LIKELY(s.ok())) {
+          empty_batch = true;
+        }
+        break;
       case kTypeRollbackXID:
         assert(wb->content_flags_.load(std::memory_order_relaxed) &
                (ContentFlags::DEFERRED | ContentFlags::HAS_ROLLBACK));
@@ -824,6 +844,19 @@ Status WriteBatchInternal::MarkCommit(WriteBatch* b, const Slice& xid) {
   return Status::OK();
 }
 
+Status WriteBatchInternal::MarkCommitWithTimestamp(WriteBatch* b,
+                                                   const Slice& xid,
+                                                   const Slice& commit_ts) {
+  assert(!commit_ts.empty());
+  b->rep_.push_back(static_cast<char>(kTypeCommitXIDAndTimestamp));
+  PutLengthPrefixedSlice(&b->rep_, commit_ts);
+  PutLengthPrefixedSlice(&b->rep_, xid);
+  b->content_flags_.store(b->content_flags_.load(std::memory_order_relaxed) |
+                              ContentFlags::HAS_COMMIT,
+                          std::memory_order_relaxed);
+  return Status::OK();
+}
+
 Status WriteBatchInternal::MarkRollback(WriteBatch* b, const Slice& xid) {
   b->rep_.push_back(static_cast<char>(kTypeRollbackXID));
   PutLengthPrefixedSlice(&b->rep_, xid);
@@ -2072,6 +2105,8 @@ class MemTableInserter : public WriteBatch::Handler {
     Status s;
 
     if (recovering_log_number_ != 0) {
+      // We must hold db mutex in recovery.
+      db_->mutex()->AssertHeld();
       // in recovery when we encounter a commit marker
       // we lookup this transaction in our set of rebuilt transactions
       // and commit.
@@ -2114,6 +2149,76 @@ class MemTableInserter : public WriteBatch::Handler {
     return s;
   }
 
+  Status MarkCommitWithTimestamp(const Slice& name,
+                                 const Slice& commit_ts) override {
+    assert(db_);
+
+    Status s;
+
+    if (recovering_log_number_ != 0) {
+      // In recovery, db mutex must be held.
+      db_->mutex()->AssertHeld();
+      // in recovery when we encounter a commit marker
+      // we lookup this transaction in our set of rebuilt transactions
+      // and commit.
+      auto trx = db_->GetRecoveredTransaction(name.ToString());
+      // the log containing the prepared section may have
+      // been released in the last incarnation because the
+      // data was flushed to L0
+      if (trx) {
+        // at this point individual CF lognumbers will prevent
+        // duplicate re-insertion of values.
+        assert(0 == log_number_ref_);
+        if (write_after_commit_) {
+          // write_after_commit_ can only have one batch in trx.
+          assert(trx->batches_.size() == 1);
+          const auto& batch_info = trx->batches_.begin()->second;
+          // all inserts must reference this trx log number
+          log_number_ref_ = batch_info.log_number_;
+          const auto checker = [this](uint32_t cf, size_t& ts_sz) {
+            assert(db_);
+            VersionSet* const vset = db_->GetVersionSet();
+            assert(vset);
+            ColumnFamilySet* const cf_set = vset->GetColumnFamilySet();
+            assert(cf_set);
+            ColumnFamilyData* cfd = cf_set->GetColumnFamily(cf);
+            assert(cfd);
+            const auto* const ucmp = cfd->user_comparator();
+            assert(ucmp);
+            if (ucmp->timestamp_size() == 0) {
+              ts_sz = 0;
+            } else if (ucmp->timestamp_size() != ts_sz) {
+              return Status::InvalidArgument("Timestamp size mismatch");
+            }
+            return Status::OK();
+          };
+          s = batch_info.batch_->AssignTimestamp(commit_ts, checker);
+          if (s.ok()) {
+            s = batch_info.batch_->Iterate(this);
+            log_number_ref_ = 0;
+          }
+        }
+        // else the values are already inserted before the commit
+
+        if (s.ok()) {
+          db_->DeleteRecoveredTransaction(name.ToString());
+        }
+        if (has_valid_writes_) {
+          *has_valid_writes_ = true;
+        }
+      }
+    } else {
+      // When writes are not delayed until commit, there is no connection
+      // between a memtable write and the WAL that supports it. So the commit
+      // need not reference any log as the only log to which it depends.
+      assert(!write_after_commit_ || log_number_ref_ > 0);
+    }
+    constexpr bool batch_boundary = true;
+    MaybeAdvanceSeq(batch_boundary);
+
+    return s;
+  }
+
   Status MarkRollback(const Slice& name) override {
     assert(db_);
 

db/write_batch_internal.h

@@ -124,6 +124,9 @@ class WriteBatchInternal {
 
   static Status MarkCommit(WriteBatch* batch, const Slice& xid);
 
+  static Status MarkCommitWithTimestamp(WriteBatch* batch, const Slice& xid,
+                                        const Slice& commit_ts);
+
   static Status InsertNoop(WriteBatch* batch);
 
   // Return the number of entries in the batch.
@@ -302,8 +305,14 @@ class TimestampAssignerBase : public WriteBatch::Handler {
 
   Status MarkCommit(const Slice&) override { return Status::OK(); }
 
+  Status MarkCommitWithTimestamp(const Slice&, const Slice&) override {
+    return Status::OK();
+  }
+
   Status MarkRollback(const Slice&) override { return Status::OK(); }
 
+  Status MarkNoop(bool /*empty_batch*/) override { return Status::OK(); }
+
  protected:
   Status AssignTimestamp(uint32_t cf, const Slice& key) {
     Status s = static_cast_with_check<Derived>(this)->AssignTimestampImpl(

db/write_batch_test.cc

@@ -318,6 +318,11 @@ namespace {
       seen += "MarkCommit(" + xid.ToString() + ")";
       return Status::OK();
     }
+    Status MarkCommitWithTimestamp(const Slice& xid, const Slice& ts) override {
+      seen += "MarkCommitWithTimestamp(" + xid.ToString() + ", " +
+              ts.ToString(true) + ")";
+      return Status::OK();
+    }
     Status MarkRollback(const Slice& xid) override {
       seen += "MarkRollback(" + xid.ToString() + ")";
       return Status::OK();
@@ -1057,6 +1062,20 @@ TEST_F(WriteBatchTest, AssignTimestamps) {
       batch, std::string(timestamp_size, '\xee'), cf_to_ucmps));
 }
 
+TEST_F(WriteBatchTest, CommitWithTimestamp) {
+  WriteBatch wb;
+  const std::string txn_name = "xid1";
+  std::string ts;
+  constexpr uint64_t commit_ts = 23;
+  PutFixed64(&ts, commit_ts);
+  ASSERT_OK(WriteBatchInternal::MarkCommitWithTimestamp(&wb, txn_name, ts));
+  TestHandler handler;
+  ASSERT_OK(wb.Iterate(&handler));
+  ASSERT_EQ("MarkCommitWithTimestamp(" + txn_name + ", " +
+                Slice(ts).ToString(true) + ")",
+            handler.seen);
+}
+
 }  // namespace ROCKSDB_NAMESPACE
 
 int main(int argc, char** argv) {

include/rocksdb/write_batch.h

@@ -288,6 +288,12 @@ class WriteBatch : public WriteBatchBase {
       return Status::InvalidArgument("MarkCommit() handler not defined.");
     }
 
+    virtual Status MarkCommitWithTimestamp(const Slice& /*xid*/,
+                                           const Slice& /*commit_ts*/) {
+      return Status::InvalidArgument(
+          "MarkCommitWithTimestamp() handler not defined.");
+    }
+
     // Continue is called by WriteBatch::Iterate. If it returns false,
     // iteration is halted. Otherwise, it continues iterating. The default
     // implementation always returns true.

java/rocksjni/portal.h

@@ -3240,6 +3240,27 @@ class WriteBatchHandlerJni
     return mid;
   }
 
+  /**
+   * Get the Java Method: WriteBatch.Handler#markCommitWithTimestamp
+   *
+   * @param env A pointer to the Java environment
+   *
+   * @return The Java Method ID or nullptr if the class or method id could not
+   *     be retrieved
+   */
+  static jmethodID getMarkCommitWithTimestampMethodId(JNIEnv* env) {
+    jclass jclazz = getJClass(env);
+    if (jclazz == nullptr) {
+      // exception occurred accessing class
+      return nullptr;
+    }
+
+    static jmethodID mid =
+        env->GetMethodID(jclazz, "markCommitWithTimestamp", "([B[B)V");
+    assert(mid != nullptr);
+    return mid;
+  }
+
   /**
    * Get the Java Method: WriteBatch.Handler#shouldContinue
    *

java/rocksjni/writebatchhandlerjnicallback.cc

@@ -121,6 +121,13 @@ WriteBatchHandlerJniCallback::WriteBatchHandlerJniCallback(
     return;
   }
 
+  m_jMarkCommitWithTimestampMethodId =
+      WriteBatchHandlerJni::getMarkCommitWithTimestampMethodId(env);
+  if (m_jMarkCommitWithTimestampMethodId == nullptr) {
+    // exception thrown
+    return;
+  }
+
   m_jContinueMethodId = WriteBatchHandlerJni::getContinueMethodId(env);
   if(m_jContinueMethodId == nullptr) {
     // exception thrown
@@ -429,6 +436,23 @@ ROCKSDB_NAMESPACE::Status WriteBatchHandlerJniCallback::MarkCommit(
   }
 }
 
+ROCKSDB_NAMESPACE::Status WriteBatchHandlerJniCallback::MarkCommitWithTimestamp(
+    const Slice& xid, const Slice& ts) {
+  auto markCommitWithTimestamp = [this](jbyteArray j_xid, jbyteArray j_ts) {
+    m_env->CallVoidMethod(m_jcallback_obj, m_jMarkCommitWithTimestampMethodId,
+                          j_xid, j_ts);
+  };
+  auto status =
+      WriteBatchHandlerJniCallback::kv_op(xid, ts, markCommitWithTimestamp);
+  if (status == nullptr) {
+    return ROCKSDB_NAMESPACE::Status::OK();  // TODO(AR) what to do if there is
+                                             // an Exception but we don't know
+                                             // the ROCKSDB_NAMESPACE::Status?
+  } else {
+    return ROCKSDB_NAMESPACE::Status(*status);
+  }
+}
+
 bool WriteBatchHandlerJniCallback::Continue() {
   jboolean jContinue = m_env->CallBooleanMethod(
       m_jcallback_obj,

java/rocksjni/writebatchhandlerjnicallback.h

@@ -48,6 +48,7 @@ class WriteBatchHandlerJniCallback : public JniCallback, public WriteBatch::Hand
     Status MarkNoop(bool empty_batch);
     Status MarkRollback(const Slice& xid);
     Status MarkCommit(const Slice& xid);
+    Status MarkCommitWithTimestamp(const Slice& xid, const Slice& commit_ts);
     bool Continue();
 
  private:
@@ -69,6 +70,7 @@ class WriteBatchHandlerJniCallback : public JniCallback, public WriteBatch::Hand
     jmethodID m_jMarkNoopMethodId;
     jmethodID m_jMarkRollbackMethodId;
     jmethodID m_jMarkCommitMethodId;
+    jmethodID m_jMarkCommitWithTimestampMethodId;
     jmethodID m_jContinueMethodId;
     /**
      * @return A pointer to a ROCKSDB_NAMESPACE::Status or nullptr if an

java/src/main/java/org/rocksdb/WriteBatch.java

@@ -321,6 +321,8 @@ public class WriteBatch extends AbstractWriteBatch {
         throws RocksDBException;
     public abstract void markCommit(final byte[] xid)
         throws RocksDBException;
+    public abstract void markCommitWithTimestamp(final byte[] xid, final byte[] ts)
+        throws RocksDBException;
 
     /**
      * shouldContinue is called by the underlying iterator

java/src/test/java/org/rocksdb/util/CapturingWriteBatchHandler.java

@@ -119,6 +119,11 @@ public class CapturingWriteBatchHandler extends WriteBatch.Handler {
     events.add(new Event(Action.MARK_COMMIT, (byte[])null, (byte[])null));
   }
 
+  @Override
+  public void markCommitWithTimestamp(final byte[] xid, final byte[] ts) throws RocksDBException {
+    events.add(new Event(Action.MARK_COMMIT_WITH_TIMESTAMP, (byte[]) null, (byte[]) null));
+  }
+
   public static class Event {
     public final Action action;
     public final int columnFamilyId;
@@ -168,7 +173,18 @@ public class CapturingWriteBatchHandler extends WriteBatch.Handler {
    * event actions
    */
   public enum Action {
-    PUT, MERGE, DELETE, SINGLE_DELETE, DELETE_RANGE, LOG, PUT_BLOB_INDEX,
-    MARK_BEGIN_PREPARE, MARK_END_PREPARE, MARK_NOOP, MARK_COMMIT,
-    MARK_ROLLBACK }
+    PUT,
+    MERGE,
+    DELETE,
+    SINGLE_DELETE,
+    DELETE_RANGE,
+    LOG,
+    PUT_BLOB_INDEX,
+    MARK_BEGIN_PREPARE,
+    MARK_END_PREPARE,
+    MARK_NOOP,
+    MARK_COMMIT,
+    MARK_ROLLBACK,
+    MARK_COMMIT_WITH_TIMESTAMP
+  }
 }

java/src/test/java/org/rocksdb/util/WriteBatchGetter.java

@@ -131,4 +131,9 @@ public class WriteBatchGetter extends WriteBatch.Handler {
   public void markCommit(final byte[] xid) throws RocksDBException {
     throw new UnsupportedOperationException();
   }
+
+  @Override
+  public void markCommitWithTimestamp(final byte[] xid, final byte[] ts) throws RocksDBException {
+    throw new UnsupportedOperationException();
+  }
 }

tools/ldb_cmd.cc

@@ -2322,6 +2322,14 @@ class InMemoryHandler : public WriteBatch::Handler {
     return Status::OK();
   }
 
+  Status MarkCommitWithTimestamp(const Slice& xid,
+                                 const Slice& commit_ts) override {
+    row_ << "COMMIT_WITH_TIMESTAMP(";
+    row_ << LDBCommand::StringToHex(xid.ToString()) << ", ";
+    row_ << LDBCommand::StringToHex(commit_ts.ToString()) << ") ";
+    return Status::OK();
+  }
+
   ~InMemoryHandler() override {}
 
  protected:

tools/trace_analyzer_tool.h

@@ -242,6 +242,12 @@ class TraceAnalyzer : private TraceRecord::Handler,
   using WriteBatch::Handler::MarkCommit;
   Status MarkCommit(const Slice& /*xid*/) override { return Status::OK(); }
 
+  using WriteBatch::Handler::MarkCommitWithTimestamp;
+  Status MarkCommitWithTimestamp(const Slice& /*xid*/,
+                                 const Slice& /*commit_ts*/) override {
+    return Status::OK();
+  }
+
   // Process each trace operation and output the analysis result to
   // stdout/files.
   Status OutputAnalysisResult(TraceOperationType op_type, uint64_t timestamp,

utilities/transactions/transaction_base.cc

@@ -663,6 +663,10 @@ Status TransactionBaseImpl::RebuildFromWriteBatch(WriteBatch* src_batch) {
       return Status::InvalidArgument();
     }
 
+    Status MarkCommitWithTimestamp(const Slice&, const Slice&) override {
+      return Status::InvalidArgument();
+    }
+
     Status MarkRollback(const Slice&) override {
       return Status::InvalidArgument();
     }