Examples with TimeoutService io.pravega.controller.timeout.TimeoutService used on opensource projects

Example 1 with TimeoutService

use of io.pravega.controller.timeout.TimeoutService in project pravega by pravega.

the class StreamTransactionMetadataTasks method sealTxnBody.

/**
 * Seals a txn and transitions it to COMMITTING (resp. ABORTING) state if commit param is true (resp. false).
 *
 * Post-condition:
 * 1. If seal completes successfully, then
 *     (a) txn state is COMMITTING/ABORTING,
 *     (b) CommitEvent/AbortEvent is present in the commit stream/abort stream,
 *     (c) txn is removed from host-txn index,
 *     (d) txn is removed from the timeout service.
 *
 * 2. If process fails after transitioning txn to COMMITTING/ABORTING state, but before responding to client, then
 * since txn is present in the host-txn index, some other controller process shall put CommitEvent/AbortEvent to
 * commit stream/abort stream.
 *
 * @param host    host id. It is different from hostId iff invoked from TxnSweeper for aborting orphaned txn.
 * @param scope   scope name.
 * @param stream  stream name.
 * @param commit  boolean indicating whether to commit txn.
 * @param txnId   txn id.
 * @param version expected version of txn node in store.
 * @param ctx     context.
 * @return        Txn status after sealing it.
 */
CompletableFuture<TxnStatus> sealTxnBody(final String host, final String scope, final String stream, final boolean commit, final UUID txnId, final Version version, final String writerId, final long timestamp, final OperationContext ctx) {
    Preconditions.checkNotNull(ctx, "Operation context cannot be null");
    long requestId = ctx.getRequestId();
    TxnResource resource = new TxnResource(scope, stream, txnId);
    Optional<Version> versionOpt = Optional.ofNullable(version);
    // Step 1. Add txn to current host's index, if it is not already present
    CompletableFuture<Void> addIndex = host.equals(hostId) && !timeoutService.containsTxn(scope, stream, txnId) ? // then txn would no longer be open.
    streamMetadataStore.addTxnToIndex(hostId, resource, version) : CompletableFuture.completedFuture(null);
    addIndex.whenComplete((v, e) -> {
        if (e != null) {
            log.debug(requestId, "Txn={}, already present/newly added to host-txn index of host={}", txnId, hostId);
        } else {
            log.debug(requestId, "Txn={}, added txn to host-txn index of host={}", txnId, hostId);
        }
    });
    // Step 2. Seal txn
    CompletableFuture<AbstractMap.SimpleEntry<TxnStatus, Integer>> sealFuture = addIndex.thenComposeAsync(x -> streamMetadataStore.sealTransaction(scope, stream, txnId, commit, versionOpt, writerId, timestamp, ctx, executor), executor).whenComplete((v, e) -> {
        if (e != null) {
            log.debug(requestId, "Txn={}, failed sealing txn", txnId);
        } else {
            log.debug(requestId, "Txn={}, sealed successfully, commit={}", txnId, commit);
        }
    });
    // Step 3. write event to corresponding stream.
    return sealFuture.thenComposeAsync(pair -> {
        TxnStatus status = pair.getKey();
        switch(status) {
            case COMMITTING:
                return writeCommitEvent(scope, stream, pair.getValue(), txnId, status, requestId);
            case ABORTING:
                return writeAbortEvent(scope, stream, pair.getValue(), txnId, status, requestId);
            case ABORTED:
            case COMMITTED:
                return CompletableFuture.completedFuture(status);
            case OPEN:
            case UNKNOWN:
            default:
                // exception would be thrown.
                return CompletableFuture.completedFuture(status);
        }
    }, executor).thenComposeAsync(status -> {
        // Step 4. Remove txn from timeoutService, and from the index.
        timeoutService.removeTxn(scope, stream, txnId);
        log.debug(requestId, "Txn={}, removed from timeout service", txnId);
        return streamMetadataStore.removeTxnFromIndex(host, resource, true).whenComplete((v, e) -> {
            if (e != null) {
                log.debug(requestId, "Txn={}, failed removing txn from host-txn index of host={}", txnId, hostId);
            } else {
                log.debug(requestId, "Txn={}, removed txn from host-txn index of host={}", txnId, hostId);
            }
        }).thenApply(x -> status);
    }, executor);
}

Example 2 with TimeoutService

use of io.pravega.controller.timeout.TimeoutService in project pravega by pravega.

the class StreamTransactionMetadataTasks method sealTxnBody.

/**
 * Seals a txn and transitions it to COMMITTING (resp. ABORTING) state if commit param is true (resp. false).
 *
 * Post-condition:
 * 1. If seal completes successfully, then
 *     (a) txn state is COMMITTING/ABORTING,
 *     (b) CommitEvent/AbortEvent is present in the commit stream/abort stream,
 *     (c) txn is removed from host-txn index,
 *     (d) txn is removed from the timeout service.
 *
 * 2. If process fails after transitioning txn to COMMITTING/ABORTING state, but before responding to client, then
 * since txn is present in the host-txn index, some other controller process shall put CommitEvent/AbortEvent to
 * commit stream/abort stream.
 *
 * @param host    host id. It is different from hostId iff invoked from TxnSweeper for aborting orphaned txn.
 * @param scope   scope name.
 * @param stream  stream name.
 * @param commit  boolean indicating whether to commit txn.
 * @param txnId   txn id.
 * @param version expected version of txn node in store.
 * @param ctx     context.
 * @return        Txn status after sealing it.
 */
CompletableFuture<TxnStatus> sealTxnBody(final String host, final String scope, final String stream, final boolean commit, final UUID txnId, final Integer version, final OperationContext ctx) {
    TxnResource resource = new TxnResource(scope, stream, txnId);
    Optional<Integer> versionOpt = Optional.ofNullable(version);
    // Step 1. Add txn to current host's index, if it is not already present
    CompletableFuture<Void> addIndex = host.equals(hostId) && !timeoutService.containsTxn(scope, stream, txnId) ? // then txn would no longer be open.
    streamMetadataStore.addTxnToIndex(hostId, resource, Integer.MAX_VALUE) : CompletableFuture.completedFuture(null);
    addIndex.whenComplete((v, e) -> {
        if (e != null) {
            log.debug("Txn={}, already present/newly added to host-txn index of host={}", txnId, hostId);
        } else {
            log.debug("Txn={}, added txn to host-txn index of host={}", txnId, hostId);
        }
    });
    // Step 2. Seal txn
    CompletableFuture<AbstractMap.SimpleEntry<TxnStatus, Integer>> sealFuture = addIndex.thenComposeAsync(x -> streamMetadataStore.sealTransaction(scope, stream, txnId, commit, versionOpt, ctx, executor), executor).whenComplete((v, e) -> {
        if (e != null) {
            log.debug("Txn={}, failed sealing txn", txnId);
        } else {
            log.debug("Txn={}, sealed successfully, commit={}", txnId, commit);
        }
    });
    // Step 3. write event to corresponding stream.
    return sealFuture.thenComposeAsync(pair -> {
        TxnStatus status = pair.getKey();
        switch(status) {
            case COMMITTING:
                return writeCommitEvent(scope, stream, pair.getValue(), txnId, status);
            case ABORTING:
                return writeAbortEvent(scope, stream, pair.getValue(), txnId, status);
            case ABORTED:
            case COMMITTED:
                return CompletableFuture.completedFuture(status);
            case OPEN:
            case UNKNOWN:
            default:
                // exception would be thrown.
                return CompletableFuture.completedFuture(status);
        }
    }, executor).thenComposeAsync(status -> {
        // Step 4. Remove txn from timeoutService, and from the index.
        timeoutService.removeTxn(scope, stream, txnId);
        log.debug("Txn={}, removed from timeout service", txnId);
        return streamMetadataStore.removeTxnFromIndex(host, resource, true).whenComplete((v, e) -> {
            if (e != null) {
                log.debug("Txn={}, failed removing txn from host-txn index of host={}", txnId, hostId);
            } else {
                log.debug("Txn={}, removed txn from host-txn index of host={}", txnId, hostId);
            }
        }).thenApply(x -> status);
    }, executor);
}