Examples with PartitionMetadata io.cdap.cdap.api.dataset.lib.PartitionMetadata used on opensource projects

Example 1 with PartitionMetadata

use of io.cdap.cdap.api.dataset.lib.PartitionMetadata in project cdap by caskdata.

the class PartitionedFileSetDataset method fixPartitions.

/**
 * This method can bring a partitioned file set in sync with explore. It scans the partition table and adds
 * every partition to explore. It will start multiple transactions, processing a batch of partitions in each
 * transaction. Optionally, it can disable and re-enable explore first, that is, drop and recreate the Hive table.
 * @param transactional the Transactional for executing transactions
 * @param datasetName the name of the dataset to fix
 * @param doDisable whether to disable and re-enable explore first
 * @param partitionsPerTx how many partitions to process per transaction
 * @param verbose whether to log verbosely. If true, this will log a message for every partition; otherwise it
 *                will only log a report of how many partitions were added / could not be added.
 */
@Beta
@SuppressWarnings("unused")
public static void fixPartitions(Transactional transactional, final String datasetName, boolean doDisable, final int partitionsPerTx, final boolean verbose) {
    if (doDisable) {
        try {
            transactional.execute(new TxRunnable() {

                @Override
                public void run(io.cdap.cdap.api.data.DatasetContext context) throws Exception {
                    PartitionedFileSetDataset pfs = context.getDataset(datasetName);
                    pfs.disableExplore();
                    // truncating = true, because this is like truncating
                    pfs.enableExplore(true);
                }
            });
        } catch (TransactionFailureException e) {
            throw new DataSetException("Unable to disable and enable Explore", e.getCause());
        } catch (RuntimeException e) {
            if (e.getCause() instanceof TransactionFailureException) {
                throw new DataSetException("Unable to disable and enable Explore", e.getCause().getCause());
            }
            throw e;
        }
    }
    final AtomicReference<PartitionKey> startKey = new AtomicReference<>();
    final AtomicLong errorCount = new AtomicLong(0L);
    final AtomicLong successCount = new AtomicLong(0L);
    do {
        try {
            transactional.execute(new TxRunnable() {

                @Override
                public void run(io.cdap.cdap.api.data.DatasetContext context) throws Exception {
                    final PartitionedFileSetDataset pfs = context.getDataset(datasetName);
                    // compute start row for the scan, reset remembered start key to null
                    byte[] startRow = startKey.get() == null ? null : generateRowKey(startKey.get(), pfs.getPartitioning());
                    startKey.set(null);
                    PartitionConsumer consumer = new PartitionConsumer() {

                        int count = 0;

                        @Override
                        public void consume(PartitionKey key, String path, @Nullable PartitionMetadata metadata) {
                            if (count >= partitionsPerTx) {
                                // reached the limit: remember this key as the start for the next round
                                startKey.set(key);
                                return;
                            }
                            try {
                                pfs.addPartitionToExplore(key, path);
                                successCount.incrementAndGet();
                                if (verbose) {
                                    LOG.info("Added partition {} with path {}", key, path);
                                }
                            } catch (DataSetException e) {
                                errorCount.incrementAndGet();
                                if (verbose) {
                                    LOG.warn(e.getMessage(), e);
                                }
                            }
                            count++;
                        }
                    };
                    pfs.getPartitions(null, consumer, false, startRow, null, partitionsPerTx + 1);
                }
            });
        } catch (TransactionConflictException e) {
            throw new DataSetException("Transaction conflict while reading partitions. This should never happen. " + "Make sure that no other programs are using this dataset at the same time.");
        } catch (TransactionFailureException e) {
            throw new DataSetException("Transaction failure: " + e.getMessage(), e.getCause());
        } catch (RuntimeException e) {
            // this looks like duplication but is needed in case this is run from a worker: see CDAP-6837
            if (e.getCause() instanceof TransactionConflictException) {
                throw new DataSetException("Transaction conflict while reading partitions. This should never happen. " + "Make sure that no other programs are using this dataset at the same time.");
            } else if (e.getCause() instanceof TransactionFailureException) {
                throw new DataSetException("Transaction failure: " + e.getMessage(), e.getCause().getCause());
            } else {
                throw e;
            }
        }
    } while (// if it is null, then we consumed less than the limit in this round -> done
    startKey.get() != null);
    LOG.info("Added {} partitions, failed to add {} partitions.", successCount.get(), errorCount.get());
}