Examples with ConflictResolutionStrategy org.apache.hudi.client.transaction.ConflictResolutionStrategy used on opensource projects

Example 1 with ConflictResolutionStrategy

use of org.apache.hudi.client.transaction.ConflictResolutionStrategy in project hudi by apache.

the class TransactionUtils method resolveWriteConflictIfAny.

/**
 * Resolve any write conflicts when committing data.
 *
 * @param table
 * @param currentTxnOwnerInstant
 * @param thisCommitMetadata
 * @param config
 * @param lastCompletedTxnOwnerInstant
 * @return
 * @throws HoodieWriteConflictException
 */
public static Option<HoodieCommitMetadata> resolveWriteConflictIfAny(final HoodieTable table, final Option<HoodieInstant> currentTxnOwnerInstant, final Option<HoodieCommitMetadata> thisCommitMetadata, final HoodieWriteConfig config, Option<HoodieInstant> lastCompletedTxnOwnerInstant, boolean reloadActiveTimeline) throws HoodieWriteConflictException {
    if (config.getWriteConcurrencyMode().supportsOptimisticConcurrencyControl()) {
        ConflictResolutionStrategy resolutionStrategy = config.getWriteConflictResolutionStrategy();
        Stream<HoodieInstant> instantStream = resolutionStrategy.getCandidateInstants(reloadActiveTimeline ? table.getMetaClient().reloadActiveTimeline() : table.getActiveTimeline(), currentTxnOwnerInstant.get(), lastCompletedTxnOwnerInstant);
        final ConcurrentOperation thisOperation = new ConcurrentOperation(currentTxnOwnerInstant.get(), thisCommitMetadata.orElse(new HoodieCommitMetadata()));
        instantStream.forEach(instant -> {
            try {
                ConcurrentOperation otherOperation = new ConcurrentOperation(instant, table.getMetaClient());
                if (resolutionStrategy.hasConflict(thisOperation, otherOperation)) {
                    LOG.info("Conflict encountered between current instant = " + thisOperation + " and instant = " + otherOperation + ", attempting to resolve it...");
                    resolutionStrategy.resolveConflict(table, thisOperation, otherOperation);
                }
            } catch (IOException io) {
                throw new HoodieWriteConflictException("Unable to resolve conflict, if present", io);
            }
        });
        LOG.info("Successfully resolved conflicts, if any");
        return thisOperation.getCommitMetadataOption();
    }
    return thisCommitMetadata;
}