Package com.continuuity.tephra.persist

Examples of com.continuuity.tephra.persist.TransactionSnapshot

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      Collection<Long> invalid = decodeInvalid(decoder);
      NavigableMap<Long, TransactionManager.InProgressTx> inProgress = decodeInProgress(decoder);
      NavigableMap<Long, Set<ChangeId>> committing = decodeChangeSets(decoder);
      NavigableMap<Long, Set<ChangeId>> committed = decodeChangeSets(decoder);

      return new TransactionSnapshot(timestamp, readPointer, writePointer, invalid, inProgress,
                                     committing, committed);
    } catch (IOException e) {
      LOG.error("Unable to deserialize transaction state: ", e);
      throw Throwables.propagate(e);
    }
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      this.logReadLock.unlock();
    }
  }

  public synchronized TransactionSnapshot getSnapshot() throws IOException {
    TransactionSnapshot snapshot = null;
    if (!isRunning() && !isStopping()) {
      return null;
    }

    long now = System.currentTimeMillis();
    // avoid duplicate snapshots at same timestamp
    if (now == lastSnapshotTime || (currentLog != null && now == currentLog.getTimestamp())) {
      try {
        TimeUnit.MILLISECONDS.sleep(1);
      } catch (InterruptedException ie) { }
    }
    // copy in memory state
    snapshot = getCurrentState();

    LOG.info("Starting snapshot of transaction state with timestamp {}", snapshot.getTimestamp());
    LOG.info("Returning snapshot of state: " + snapshot);
    return snapshot;
  }
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  /**
   * Take a snapshot of the transaction state and serialize it into the given output stream.
   * @return whether a snapshot was taken.
   */
  public boolean takeSnapshot(OutputStream out) throws IOException {
    TransactionSnapshot snapshot = getSnapshot();
    if (snapshot != null) {
      persistor.writeSnapshot(out, snapshot);
      return true;
    } else {
      return false;
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    }
  }

  private void doSnapshot(boolean closing) throws IOException {
    long snapshotTime = 0L;
    TransactionSnapshot snapshot = null;
    TransactionLog oldLog = null;
    try {
      this.logWriteLock.lock();
      try {
        synchronized (this) {
          snapshot = getSnapshot();
          if (snapshot == null && !closing) {
            return;
          }
          if (snapshot != null) {
            snapshotTime = snapshot.getTimestamp();
          }

          // roll WAL
          oldLog = currentLog;
          if (!closing) {
            currentLog = persistor.createLog(snapshot.getTimestamp());
          }
        }
        // there may not be an existing log on startup
        if (oldLog != null) {
          oldLog.close();
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                                        invalid, inProgress, committingChangeSets, committedChangeSets);
  }

  public synchronized void recoverState() {
    try {
      TransactionSnapshot lastSnapshot = persistor.getLatestSnapshot();
      // if we failed before a snapshot could complete, we might not have one to restore
      if (lastSnapshot != null) {
        restoreSnapshot(lastSnapshot);
      }
      // replay any WALs since the last snapshot
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    }

    // only continue if initialization was successful
    if (initialized) {
      long now = System.currentTimeMillis();
      TransactionSnapshot currentSnapshot = storage.getLatestSnapshot();
      if (currentSnapshot != null) {
        if (currentSnapshot.getTimestamp() < (now - 2 * snapshotRefreshFrequency)) {
          LOG.info("Current snapshot is old, will force a refresh on next run.");
          reset();
        } else {
          latestState = currentSnapshot;
          LOG.info("Transaction state reloaded with snapshot from " + latestState.getTimestamp());
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    }

    // only continue if initialization was successful
    if (initialized) {
      long now = System.currentTimeMillis();
      TransactionSnapshot currentSnapshot = storage.getLatestSnapshot();
      if (currentSnapshot != null) {
        if (currentSnapshot.getTimestamp() < (now - 2 * snapshotRefreshFrequency)) {
          LOG.info("Current snapshot is old, will force a refresh on next run.");
          reset();
        } else {
          latestState = currentSnapshot;
          LOG.info("Transaction state reloaded with snapshot from " + latestState.getTimestamp());
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      Collection<Long> invalid = decodeInvalid(decoder);
      NavigableMap<Long, InMemoryTransactionManager.InProgressTx> inProgress = decodeInProgress(decoder);
      NavigableMap<Long, Set<ChangeId>> committing = decodeChangeSets(decoder);
      NavigableMap<Long, Set<ChangeId>> committed = decodeChangeSets(decoder);

      return new TransactionSnapshot(timestamp, readPointer, writePointer, invalid, inProgress,
                                     committing, committed);
    } catch (IOException e) {
      LOG.error("Unable to deserialize transaction state: ", e);
      throw Throwables.propagate(e);
    }
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      this.logReadLock.unlock();
    }
  }

  public synchronized TransactionSnapshot getSnapshot() throws IOException {
    TransactionSnapshot snapshot = null;
    if (!isRunning() && !isStopping()) {
      return null;
    }

    long now = System.currentTimeMillis();
    // avoid duplicate snapshots at same timestamp
    if (now == lastSnapshotTime || (currentLog != null && now == currentLog.getTimestamp())) {
      try {
        TimeUnit.MILLISECONDS.sleep(1);
      } catch (InterruptedException ie) { }
    }
    // copy in memory state
    snapshot = getCurrentState();

    LOG.info("Starting snapshot of transaction state with timestamp {}", snapshot.getTimestamp());
    LOG.info("Returning snapshot of state: " + snapshot);
    return snapshot;
  }
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  /**
   * Take a snapshot of the transaction state and serialize it into the given output stream.
   * @return whether a snapshot was taken.
   */
  public boolean takeSnapshot(OutputStream out) throws IOException {
    TransactionSnapshot snapshot = getSnapshot();
    if (snapshot != null) {
      persistor.writeSnapshot(out, snapshot);
      return true;
    } else {
      return false;
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Related Classes of com.continuuity.tephra.persist.TransactionSnapshot

  • com.continuuity.tephra.coprocessor.hbase94.TransactionDataJanitor
  • com.continuuity.tephra.coprocessor.hbase96.TransactionDataJanitor
  • com.continuuity.tephra.coprocessor.TransactionStateCache
  • com.continuuity.tephra.inmemory.InMemoryTransactionManager
  • com.continuuity.tephra.snapshot.DefaultSnapshotCodec
  • com.continuuity.tephra.TransactionManager
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