org.apache.hive.hcatalog.data.transfer.ReadEntity Java Examples

The following examples show how to use org.apache.hive.hcatalog.data.transfer.ReadEntity. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example #1
Source File: HiveTableReader.java    From kylin-on-parquet-v2 with Apache License 2.0 6 votes vote down vote up 
private static ReaderContext getHiveReaderContext(String database, String table, Map<String, String> partitionKV) throws Exception {
    HiveConf hiveConf = new HiveConf(HiveTableReader.class);
    Iterator<Entry<String, String>> itr = hiveConf.iterator();
    Map<String, String> map = new HashMap<String, String>();
    while (itr.hasNext()) {
        Entry<String, String> kv = itr.next();
        map.put(kv.getKey(), kv.getValue());
    }

    ReadEntity entity;
    if (partitionKV == null || partitionKV.size() == 0) {
        entity = new ReadEntity.Builder().withDatabase(database).withTable(table).build();
    } else {
        entity = new ReadEntity.Builder().withDatabase(database).withTable(table).withPartition(partitionKV).build();
    }

    HCatReader reader = DataTransferFactory.getHCatReader(entity, map);
    ReaderContext cntxt = reader.prepareRead();

    return cntxt;
}
Example #2
Source File: HiveTableReader.java    From kylin with Apache License 2.0 6 votes vote down vote up 
private static ReaderContext getHiveReaderContext(String database, String table, Map<String, String> partitionKV) throws Exception {
    HiveConf hiveConf = new HiveConf(HiveTableReader.class);
    Iterator<Entry<String, String>> itr = hiveConf.iterator();
    Map<String, String> map = new HashMap<String, String>();
    while (itr.hasNext()) {
        Entry<String, String> kv = itr.next();
        map.put(kv.getKey(), kv.getValue());
    }

    ReadEntity entity;
    if (partitionKV == null || partitionKV.size() == 0) {
        entity = new ReadEntity.Builder().withDatabase(database).withTable(table).build();
    } else {
        entity = new ReadEntity.Builder().withDatabase(database).withTable(table).withPartition(partitionKV).build();
    }

    HCatReader reader = DataTransferFactory.getHCatReader(entity, map);
    ReaderContext cntxt = reader.prepareRead();

    return cntxt;
}
Example #3
Source File: HiveTableReader.java    From Kylin with Apache License 2.0 6 votes vote down vote up 
private static ReaderContext getHiveReaderContext(String database, String table, Map<String, String> partitionKV) throws Exception {
    HiveConf hiveConf = new HiveConf(HiveTableReader.class);
    Iterator<Entry<String, String>> itr = hiveConf.iterator();
    Map<String, String> map = new HashMap<String, String>();
    while (itr.hasNext()) {
        Entry<String, String> kv = itr.next();
        map.put(kv.getKey(), kv.getValue());
    }

    ReadEntity entity;
    if (partitionKV == null || partitionKV.size() == 0) {
        entity = new ReadEntity.Builder().withDatabase(database).withTable(table).build();
    } else {
        entity = new ReadEntity.Builder().withDatabase(database).withTable(table).withPartition(partitionKV).build();
    }

    HCatReader reader = DataTransferFactory.getHCatReader(entity, map);
    ReaderContext cntxt = reader.prepareRead();

    return cntxt;
}
Example #4
Source File: PartitionReaderFn.java    From beam with Apache License 2.0 5 votes vote down vote up 
private ReaderContext getReaderContext(Read readRequest, Integer partitionIndexToRead)
    throws Exception {
  final List<Partition> partitions =
      metaStoreClient.listPartitions(
          readRequest.getDatabase(), readRequest.getTable(), Short.MAX_VALUE);
  final Partition partition = partitions.get(partitionIndexToRead);
  checkArgument(
      partition != null, "Unable to find a partition to read at index " + partitionIndexToRead);

  final int desiredSplitCount = HCatalogUtils.getSplitCount(readRequest, partition);
  final List<String> values = partition.getValues();
  final List<String> partitionCols = readRequest.getPartitionCols();
  checkArgument(
      values.size() == partitionCols.size(),
      "Number of input partitions should be equal to the values of list partition values.");

  List<String> filter = new ArrayList<>();
  for (int i = 0; i < partitionCols.size(); i++) {
    filter.add(partitionCols.get(i) + "=" + "'" + values.get(i) + "'");
  }
  final String filterString = String.join(" and ", filter);

  ReadEntity entity =
      new ReadEntity.Builder()
          .withDatabase(readRequest.getDatabase())
          .withFilter(filterString)
          .withTable(readRequest.getTable())
          .build();
  // pass the 'desired' split count as an hint to the API
  Map<String, String> configProps = new HashMap<>(readRequest.getConfigProperties());
  configProps.put(
      HCatConstants.HCAT_DESIRED_PARTITION_NUM_SPLITS, String.valueOf(desiredSplitCount));
  return DataTransferFactory.getHCatReader(entity, configProps).prepareRead();
}
Example #5
Source File: HCatalogIO.java    From beam with Apache License 2.0 5 votes vote down vote up 
private ReaderContext getReaderContext(long desiredSplitCount) throws HCatException {
  ReadEntity entity =
      new ReadEntity.Builder()
          .withDatabase(spec.getDatabase())
          .withTable(spec.getTable())
          .withFilter(spec.getFilter())
          .build();
  // pass the 'desired' split count as an hint to the API
  Map<String, String> configProps = new HashMap<>(spec.getConfigProperties());
  configProps.put(
      HCatConstants.HCAT_DESIRED_PARTITION_NUM_SPLITS, String.valueOf(desiredSplitCount));
  return DataTransferFactory.getHCatReader(entity, configProps).prepareRead();
}