使用自定义的分区函数来解决按年月分区的问题。
示例代码如下:
import org.apache.hudi.common.util.TypedProperties;
import org.apache.hudi.keygen.TimestampBasedKeyGenerator;
import org.apache.hudi.util.DateUtils;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
public class CustomTimestampBasedKeyGenerator extends TimestampBasedKeyGenerator {
public static final String PARTITION_BY_YEAR_MONTH_FIELD = "partition.by.year.month.field";
private String partitionByYearMonthField;
@Override
public void init(TypedProperties props) {
super.init(props);
partitionByYearMonthField = props.getString(PARTITION_BY_YEAR_MONTH_FIELD, "");
}
@Override
public String getPartitionPath(final String key, final Object value) {
String partitionPath = "";
if (partitionByYearMonthField.equals(FIELD_VAL_SEPARATOR)) {
List parts = Arrays.asList(key.split(FIELD_SEPARATOR));
partitionPath = DateUtils
.convertDateToPath(DateUtils.getDateTime(parts.get(partitionColumns.indexOf(partitionByYearMonthField))));
} else if (!partitionByYearMonthField.isEmpty()) {
partitionPath = DateUtils
.convertDateToPath(DateUtils.getDateTime(value.toString()));
}
return partitionPath;
}
}
在这个自定义的TimestampBasedKeyGenerator类中,我们添加了新的配置项“partition.by.year.month.field”,它表示按年月分区的字段。
然后重写了getPartitionPath方法,通过该方法来生成分区路径。在这个方法中,我们首先根据“partition.by.year.month.field”字段的值来判断是否需要按年月分区,如果需要,我们就把该字段对应的值转换成年月格式的字符串,作为分区路径。
最后,在使用该自定义的分区函数时,只需要在相应的properties中设置“partition.by.year.month.field”的值为需要按年月分区的字段即可。例如:
TypedProperties props = new TypedProperties();
props.setProperty(TimestampBasedKeyGenerator.TIMESTAMP_PRECISION_FIELD_PROP, "seconds");
props.setProperty(TimestampBasedKeyGenerator.PARTITIONPATH_FIELD_PROP, "datestr");
props.setProperty(CustomTimestampBasedKeyGenerator.PARTITION_BY_YEAR_MONTH_FIELD, "yearMonth");
CustomTimestampBasedKeyGenerator keyGenerator = new CustomTimestampBasedKeyGenerator();
keyGenerator.init(props);