smtwilio commented on code in PR #19811:
URL: https://github.com/apache/hudi/pull/19811#discussion_r3928622856
##########
hudi-utilities/src/main/java/org/apache/hudi/utilities/streamer/HoodieMultiTableStreamer.java:
##########
@@ -479,10 +516,143 @@ public void sync() {
}
}
}
+ }
- log.info("Ingestion was successful for topics: {}", successTables);
- if (!failedTables.isEmpty()) {
- log.info("Ingestion failed for topics: {}", failedTables);
+ /**
+ * Syncs all tables concurrently, one thread per table. Used for continuous
mode where each table's sync blocks
+ * indefinitely.
+ *
+ * <p>When {@code --fail-fast-on-continuous} is enabled, the first table
failure fails the whole job. The sibling
+ * streamers are shut down and a {@link HoodieException} is thrown so the
caller can exit with a non-zero status.
+ * Otherwise, every table is synced independently and a single failure does
not affect the others.
+ */
+ private void syncContinuously() {
+ // Streamer instances are registered from worker threads, so a thread-safe
list is required.
+ final List<HoodieStreamer> streamerInstances = new
CopyOnWriteArrayList<>();
+ // Set once fail fast trips, so tasks that register their streamer
afterwards stop before starting the sync.
+ final AtomicBoolean shutdownRequested = new AtomicBoolean(false);
+ final ExecutorService executor =
Executors.newFixedThreadPool(tableExecutionContexts.size(),
+ new CustomizedThreadFactory("multi-table-streamer", true));
+ boolean terminated = false;
+ try {
+ final CompletableFuture<?>[] tableFutures =
tableExecutionContexts.stream()
+ .map(context -> CompletableFuture.runAsync(() -> {
+ HoodieStreamer streamer = null;
+ try {
+ streamer = new HoodieStreamer(context.getConfig(), jssc,
Option.ofNullable(context.getProperties()));
+ streamerInstances.add(streamer);
+ // Register before checking the flag so a concurrent
shutdownStreamers() always sees this streamer.
+ if (shutdownRequested.get()) {
+ return;
+ }
+ streamer.sync();
+ // A streamer registered just before fail fast tripped can reach
here without ever ingesting.
+ // shutdown() call will be a no-op because its ingestion service
hadn't started yet.
+ // Don't count that as a success.
+ if (!shutdownRequested.get()) {
+ successTables.add(Helpers.getTableWithDatabase(context));
+ }
+ } catch (Exception e) {
+ log.error("error while running MultiTableDeltaStreamer for
table: {}", context.getTableName(), e);
+ failedTables.add(Helpers.getTableWithDatabase(context));
+ if (failFastOnContinuousMode) {
+ throw new CompletionException(e);
+ }
+ } finally {
+ if (streamer != null) {
+ streamer.shutdownGracefully();
+ }
+ }
+ }, executor)).toArray(CompletableFuture[]::new);
+
+ if (failFastOnContinuousMode) {
+ log.info("Fail fast enabled in continuous mode. The whole job fails on
any single table failure");
+ awaitFailFast(tableFutures, streamerInstances, shutdownRequested);
+ } else {
+ CompletableFuture.allOf(tableFutures).join();
+ }
+ log.info("Successful tables: {}, Failed tables: {}", successTables,
failedTables);
+ } finally {
+ // Wait for every worker thread to finish (including its finally
cleanup) before returning, so sync() does not
+ // return while a table is still writing and main() then stops the
shared Spark context under it.
+ terminated = shutdownExecutor(executor);
+ }
+ // If the workers never terminated, ingestion may still be running. Fail
loudly instead of returning as if the
+ // cleanup succeeded, so the caller does not silently proceed to Spark
teardown with live writers.
+ if (!terminated) {
+ throw new HoodieException("Timed out shutting down table ingestion
workers in continuous mode");
+ }
+ }
+
+ /**
+ * Waits until either every table sync finishes successfully or the first
one fails. On the first failure, the
+ * remaining streamers are shut down and a {@link HoodieException} is
thrown. Unlike {@code anyOf(...)}, this only
+ * trips on an <em>exceptional</em> completion, so a table that terminates
normally (e.g. via a
+ * {@link PostWriteTerminationStrategy}) does not abort its siblings.
+ */
+ private void awaitFailFast(CompletableFuture<?>[] tableFutures,
List<HoodieStreamer> streamerInstances, AtomicBoolean shutdownRequested) {
+ final CompletableFuture<Void> firstOutcome = new CompletableFuture<>();
+ // Trip as soon as any table fails ...
+ for (CompletableFuture<?> tableFuture : tableFutures) {
+ tableFuture.whenComplete((result, throwable) -> {
+ if (throwable != null) {
+ firstOutcome.completeExceptionally(throwable);
+ }
+ });
+ }
+ // ... or complete normally once every table has finished without failure.
+ CompletableFuture.allOf(tableFutures).whenComplete((result, throwable) -> {
Review Comment:
Good catch! My earlier test failed when swapped with `anyOf`. I dropped the
test and now relying on `TestFutureUtils` for the guarantee.
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