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What is the problem that two-phase commit is trying to solve?

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

answer What is the problem that two-phase commit is trying to solve?

What is the problem that two-phase commit is trying to solve?

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The two phase commit protocol is a distributed algorithm which lets all sites in a distributed system agree to commit a transaction.

The protocol results in either all nodes committing the transaction or aborting, even in the case of site failures and message losses.

class TransactionCoordinator…

  private ScheduledThreadPoolExecutor scheduler = new ScheduledThreadPoolExecutor(1);
  private ScheduledFuture<?> taskFuture;
  private long transactionTimeoutMs = Long.MAX_VALUE; //for now.

  public void startTransactionTimeoutScheduler() {
      taskFuture = scheduler.scheduleAtFixedRate(() -> timeoutTransactions(),
              transactionTimeoutMs,
              transactionTimeoutMs,
              TimeUnit.MILLISECONDS);
  }

  private void timeoutTransactions() {
      for (TransactionRef txnRef : transactions.keySet()) {
          TransactionMetadata transactionMetadata = transactions.get(txnRef);
          long now = systemClock.nanoTime();
          if (transactionMetadata.hasTimedOut(now)) {
              sendRollbackMessageToParticipants(transactionMetadata.getTxn());
              transactionMetadata.markRollbackComplete(transactionLog);
          }
      }
  }

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

Popularity 1/10 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

What is the problem that two-phase commit is trying to solve?

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