Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 108 insertions, 0 deletions

diff --git a/src/rocksdb/utilities/transactions/write_unprepared_txn_db.h b/src/rocksdb/utilities/transactions/write_unprepared_txn_db.h
new file mode 100644
index 000000000..c40e96d49
--- /dev/null
+++ b/src/rocksdb/utilities/transactions/write_unprepared_txn_db.h
@@ -0,0 +1,108 @@
+//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under both the GPLv2 (found in the
+//  COPYING file in the root directory) and Apache 2.0 License
+//  (found in the LICENSE.Apache file in the root directory).
+
+#pragma once
+#ifndef ROCKSDB_LITE
+
+#include "utilities/transactions/write_prepared_txn_db.h"
+#include "utilities/transactions/write_unprepared_txn.h"
+
+namespace ROCKSDB_NAMESPACE {
+
+class WriteUnpreparedTxn;
+
+class WriteUnpreparedTxnDB : public WritePreparedTxnDB {
+ public:
+  using WritePreparedTxnDB::WritePreparedTxnDB;
+
+  Status Initialize(const std::vector<size_t>& compaction_enabled_cf_indices,
+                    const std::vector<ColumnFamilyHandle*>& handles) override;
+
+  Transaction* BeginTransaction(const WriteOptions& write_options,
+                                const TransactionOptions& txn_options,
+                                Transaction* old_txn) override;
+
+  // Struct to hold ownership of snapshot and read callback for cleanup.
+  struct IteratorState;
+
+  using WritePreparedTxnDB::NewIterator;
+  Iterator* NewIterator(const ReadOptions& options,
+                        ColumnFamilyHandle* column_family,
+                        WriteUnpreparedTxn* txn);
+
+ private:
+  Status RollbackRecoveredTransaction(const DBImpl::RecoveredTransaction* rtxn);
+};
+
+class WriteUnpreparedCommitEntryPreReleaseCallback : public PreReleaseCallback {
+  // TODO(lth): Reduce code duplication with
+  // WritePreparedCommitEntryPreReleaseCallback
+ public:
+  // includes_data indicates that the commit also writes non-empty
+  // CommitTimeWriteBatch to memtable, which needs to be committed separately.
+  WriteUnpreparedCommitEntryPreReleaseCallback(
+      WritePreparedTxnDB* db, DBImpl* db_impl,
+      const std::map<SequenceNumber, size_t>& unprep_seqs,
+      size_t data_batch_cnt = 0, bool publish_seq = true)
+      : db_(db),
+        db_impl_(db_impl),
+        unprep_seqs_(unprep_seqs),
+        data_batch_cnt_(data_batch_cnt),
+        includes_data_(data_batch_cnt_ > 0),
+        publish_seq_(publish_seq) {
+    assert(unprep_seqs.size() > 0);
+  }
+
+  virtual Status Callback(SequenceNumber commit_seq,
+                          bool is_mem_disabled __attribute__((__unused__)),
+                          uint64_t, size_t /*index*/,
+                          size_t /*total*/) override {
+    const uint64_t last_commit_seq = LIKELY(data_batch_cnt_ <= 1)
+                                         ? commit_seq
+                                         : commit_seq + data_batch_cnt_ - 1;
+    // Recall that unprep_seqs maps (un)prepared_seq => prepare_batch_cnt.
+    for (const auto& s : unprep_seqs_) {
+      for (size_t i = 0; i < s.second; i++) {
+        db_->AddCommitted(s.first + i, last_commit_seq);
+      }
+    }
+
+    if (includes_data_) {
+      assert(data_batch_cnt_);
+      // Commit the data that is accompanied with the commit request
+      for (size_t i = 0; i < data_batch_cnt_; i++) {
+        // For commit seq of each batch use the commit seq of the last batch.
+        // This would make debugging easier by having all the batches having
+        // the same sequence number.
+        db_->AddCommitted(commit_seq + i, last_commit_seq);
+      }
+    }
+    if (db_impl_->immutable_db_options().two_write_queues && publish_seq_) {
+      assert(is_mem_disabled);  // implies the 2nd queue
+      // Publish the sequence number. We can do that here assuming the callback
+      // is invoked only from one write queue, which would guarantee that the
+      // publish sequence numbers will be in order, i.e., once a seq is
+      // published all the seq prior to that are also publishable.
+      db_impl_->SetLastPublishedSequence(last_commit_seq);
+    }
+    // else SequenceNumber that is updated as part of the write already does the
+    // publishing
+    return Status::OK();
+  }
+
+ private:
+  WritePreparedTxnDB* db_;
+  DBImpl* db_impl_;
+  const std::map<SequenceNumber, size_t>& unprep_seqs_;
+  size_t data_batch_cnt_;
+  // Either because it is commit without prepare or it has a
+  // CommitTimeWriteBatch
+  bool includes_data_;
+  // Should the callback also publishes the commit seq number
+  bool publish_seq_;
+};
+
+}  // namespace ROCKSDB_NAMESPACE
+#endif  // ROCKSDB_LITE