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Which component executes two-phase commit protocol in a distributed database?

Anjali Sharma answered on January 4, 2023 Popularity 4/10 Helpfulness 1/10

answer Which component executes two-phase commit protocol in a distributed database?

Which component executes two-phase commit protocol in a distributed database?

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Co-ordinator is the component

class MvccTransactionalKVStore…

  public void commit(TransactionRef txn, List<String> keys, long commitTimestamp) {
      if (!lockManager.hasLocksFor(txn, keys)) {
          throw new IllegalStateException("Transaction should hold all the required locks");
      }

      adjustServerTimestamp(commitTimestamp);

      applyPendingOperations(txn, commitTimestamp);

      lockManager.release(txn, keys);

      logTransactionMarker(new TransactionMarker(txn, TransactionStatus.COMMITTED, commitTimestamp, keys, Collections.EMPTY_MAP));
  }

  private void applyPendingOperations(TransactionRef txnId, long commitTimestamp) {
      Optional<TransactionState> transactionState = getTransactionState(txnId);
      if (transactionState.isPresent()) {
          TransactionState t = transactionState.get();
          Optional<Map<String, String>> pendingUpdates = t.getPendingUpdates();
          apply(txnId, pendingUpdates, commitTimestamp);
      }
  }

  private void apply(TransactionRef txnId, Optional<Map<String, String>> pendingUpdates, long commitTimestamp) {
      if (pendingUpdates.isPresent()) {
          Map<String, String> pendingKv = pendingUpdates.get();
          apply(pendingKv, commitTimestamp);
      }
      ongoingTransactions.remove(txnId);
  }


  private void apply(Map<String, String> pendingKv, long commitTimestamp) {
      for (String key : pendingKv.keySet()) {
          String value = pendingKv.get(key);
          kv.put(new VersionedKey(key, commitTimestamp), value);
      }
  }

https://martinfowler.com/articles/patterns-of-distributed-systems/two-phase-commit.html

Popularity 4/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: commit javascript

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Contributed on Jan 04 2023

Anjali Sharma

0 Answers Avg Quality 2/10

Which component executes two-phase commit protocol in a distributed database?

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