the-other-tim-brown commented on code in PR #13577:
URL: https://github.com/apache/hudi/pull/13577#discussion_r2240791813
##########
hudi-client/hudi-client-common/src/main/java/org/apache/hudi/client/transaction/TransactionManager.java:
##########
@@ -38,35 +43,122 @@ public class TransactionManager implements Serializable,
AutoCloseable {
protected static final Logger LOG =
LoggerFactory.getLogger(TransactionManager.class);
protected final LockManager lockManager;
protected final boolean isLockRequired;
+ private final transient TimeGenerator timeGenerator;
+ protected boolean hasLock;
protected Option<HoodieInstant> changeActionInstant = Option.empty();
private Option<HoodieInstant> lastCompletedActionInstant = Option.empty();
public TransactionManager(HoodieWriteConfig config, HoodieStorage storage) {
- this(new LockManager(config, storage), config.isLockRequired());
+ this(new LockManager(config, storage), config);
}
- protected TransactionManager(LockManager lockManager, boolean
isLockRequired) {
+ protected TransactionManager(LockManager lockManager, HoodieWriteConfig
writeConfig) {
+ this(lockManager, writeConfig.isLockRequired(),
TimeGenerators.getTimeGenerator(writeConfig.getTimeGeneratorConfig()));
+ }
+
+ public TransactionManager(LockManager lockManager, boolean isLockRequired,
TimeGenerator timeGenerator) {
this.lockManager = lockManager;
this.isLockRequired = isLockRequired;
+ this.timeGenerator = timeGenerator;
+ }
+
+ public String generateInstantTime() {
+ if (!hasLock && isLockRequired) {
+ throw new HoodieLockException("Cannot create instant without acquiring a
lock first.");
+ }
+ return HoodieInstantTimeGenerator.createNewInstantTime(timeGenerator, 0L);
+ }
+
+ /**
+ * Generates an instant time and executes an action that requires that
instant time within a lock.
+ * @param instantTimeConsumingAction a function that takes the generated
instant time and performs some action
+ * @return the result of the action
+ * @param <T> type of the result
+ */
+ public <T> T executeStateChangeWithInstant(Function<String, T>
instantTimeConsumingAction) {
+ return executeStateChangeWithInstant(Option.empty(), Option.empty(),
instantTimeConsumingAction);
+ }
+
+ /**
+ * Uses the provided instant if present or else generates an instant time
and executes an action that requires that instant time within a lock.
+ * @param providedInstantTime an optional instant time provided by the
caller. If not provided, a new instant time will be generated.
+ * @param instantTimeConsumingAction a function that takes the generated
instant time and performs some action
+ * @return the result of the action
+ * @param <T> type of the result
+ */
+ public <T> T executeStateChangeWithInstant(Option<String>
providedInstantTime, Function<String, T> instantTimeConsumingAction) {
+ return executeStateChangeWithInstant(providedInstantTime, Option.empty(),
instantTimeConsumingAction);
+ }
+
+ /**
+ * Uses the provided instant if present or else generates an instant time
and executes an action that requires that instant time within a lock.
+ * @param providedInstantTime an optional instant time provided by the
caller. If not provided, a new instant time will be generated.
+ * @param lastCompletedActionInstant optional input representing the last
completed instant, used for logging purposes.
+ * @param instantTimeConsumingAction a function that takes the generated
instant time and performs some action
+ * @return the result of the action
+ * @param <T> type of the result
+ */
+ public <T> T executeStateChangeWithInstant(Option<String>
providedInstantTime, Option<HoodieInstant> lastCompletedActionInstant,
Function<String, T> instantTimeConsumingAction) {
+ if (isLockRequired()) {
+ acquireLock();
+ }
+ String requestedInstant = providedInstantTime.orElseGet(() ->
HoodieInstantTimeGenerator.createNewInstantTime(timeGenerator, 0L));
+ try {
+ if (lastCompletedActionInstant.isEmpty()) {
+ LOG.info("State change starting for {}", changeActionInstant);
+ } else {
+ LOG.info("State change starting for {} with latest completed action
instant {}", changeActionInstant, lastCompletedActionInstant.get());
+ }
+ return instantTimeConsumingAction.apply(requestedInstant);
+ } finally {
+ if (isLockRequired()) {
+ releaseLock();
+ LOG.info("State change ended for {}", requestedInstant);
+ }
+ }
+ }
+
+ public void beginStateChange() {
+ beginStateChange(Option.empty(), Option.empty());
}
public void beginStateChange(Option<HoodieInstant> changeActionInstant,
Option<HoodieInstant>
lastCompletedActionInstant) {
if (isLockRequired) {
LOG.info("State change starting for {} with latest completed action
instant {}",
changeActionInstant, lastCompletedActionInstant);
- lockManager.lock();
+ acquireLock();
reset(this.changeActionInstant, changeActionInstant,
lastCompletedActionInstant);
LOG.info("State change started for {} with latest completed action
instant {}",
changeActionInstant, lastCompletedActionInstant);
}
}
+ public void endStateChange() {
+ endStateChange(Option.empty());
+ }
+
+ private void acquireLock() {
Review Comment:
I don't think there is harm in making this synchronized. Right now there is
one more gap, the TransactionManager is assumed to be used in a single thread
but the streamer's async services in Hudi just use the same write client as the
writer thread and therefore the same transaction manager. We may need to
introduce some state for which thread holds the lock.
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