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Which two phases are there in commitment?

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

answer Which two phases are there in commitment?

Which two phases are there in commitment?

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Phase 1 - Each server that needs to commit data writes its data records to the log.

If a server is unsuccessful, it responds with a failure message.

If successful, the server replies with an OK message.

Phase 2 - This phase begins after all participants respond O

class MvccTransactionCoordinator…

  public long commit(TransactionRef txn) {
          long commitTimestamp = prepare(txn);

          TransactionMetadata transactionMetadata = transactions.get(txn);
          transactionMetadata.markPreparedToCommit(commitTimestamp, this.transactionLog);

          sendCommitMessageToAllTheServers(txn, commitTimestamp, transactionMetadata.getParticipatingKeys());

          transactionMetadata.markCommitComplete(transactionLog);

          return commitTimestamp;
  }


  public long prepare(TransactionRef txn) throws WriteConflictException {
      TransactionMetadata transactionMetadata = transactions.get(txn);
      Map<MvccTransactionalKVStore, List<String>> keysToServers = getParticipants(transactionMetadata.getParticipatingKeys());
      List<Long> prepareTimestamps = new ArrayList<>();
      for (MvccTransactionalKVStore store : keysToServers.keySet()) {
          List<String> keys = keysToServers.get(store);
          long prepareTimestamp = store.prepare(txn, keys);
          prepareTimestamps.add(prepareTimestamp);
      }
      return prepareTimestamps.stream().max(Long::compare).orElse(txn.getStartTimestamp());
  }

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

Popularity 1/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript

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Contributed on Jan 04 2023

Anjali Sharma

0 Answers Avg Quality 2/10

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