This section contains a collection of guides that will show you how to import data from a Pinot supported input format.
Pinot offers support for various popular input formats during ingestion. By changing the input format, you can reduce the time spent doing serialization-deserialization and speed up the ingestion.
The input format can be changed using the recordReaderSpec config in the ingestion job spec.
The config consists of the following keys:
dataFormat - Name of the data format to consume.
className - name of the class that implements the RecordReader interface. This class is used for parsing the data.
configClassName - name of the class that implements the RecordReaderConfig interface. This class is used the parse the values mentioned in configs
configs - Key value pair for format specific configs. This field can be left out.
Pinot supports the multiple input formats out of the box. You just need to specify the corresponding readers and the associated custom configs to switch between the formats.
CSV Record Reader supports the following configs -
fileFormat - can be one of default, rfc4180, excel, tdf, mysql
header - header of the file. The columnNames should be seperated by the delimiter mentioned in the config
delimiter - The character seperating the columns
multiValueDelimiter - The character seperating multiple values in a single column. This can be used to split a column into a list.
Supported from 0.11 release -
skipHeader - skip header record in the file. Boolean
ignoreEmptyLines - ignore empty lines instead of consuming them and filling with default values. Boolean
ignoreSurroundingSpaces - ignore spaces around column names and values. Boolean
quoteCharacter - single character that is being used for quotes in CSV files
recordSeparator - character used to seperate records in the input file. Default is \n or \r\n depending on the platform.
nullStringValue - string value the represents null in CSV files. Default is empty string.
Your CSV file may have raw text fields that cannot be reliably delimited using any character. In this case, explicitly set the multiValueDelimeter field to empty in the ingestion config.
multiValueDelimiter: ''
The Avro record reader converts the data in file to a GenericRecord. A java class or .avro file is not required. By default the avro record reader only supports primitive types. You can set enableLogicalTypes to true to enable support for rest of the avro data types.
We use the following conversion table to translate between avro and pinot data types. The conversions are done using the offical avro methods present in org.apache.avro.Conversions
INT
INT
LONG
LONG
FLOAT
FLOAT
DOUBLE
DOUBLE
BOOLEAN
BOOLEAN
STRING
STRING
ENUM
STRING
BYTES
BYTES
FIXED
BYTES
MAP
JSON
ARRAY
JSON
RECORD
JSON
UNION
JSON
DECIMAL
BYTES
UUID
STRING
DATE
STRING
yyyy-MM-dd format
TIME_MILLIS
STRING
HH:mm:ss.SSS format
TIME_MICROS
STRING
HH:mm:ss.SSSSSS format
TIMESTAMP_MILLIS
TIMESTAMP
TIMESTAMP_MICROS
TIMESTAMP
Thrift requires the generated class using .thrift file to parse the data. The .class file should be available in the Pinot's classpath. You can put the files in the lib/ folder of pinot distribution directory.
Since 0.11.0 release, The Parquet record reader determines whether to use ParquetAvroRecordReader or ParquetNativeRecordReader to read records. The reader looks for parquet.avro.schema or avro.schema key in the parquet file footer and if present uses the Avro reader.
Users can however change the record reader manually in case of a misconfiguration.
For the support of DECIMAL and other parquet native data types, always use ParquetNativeRecordReader
INT96
LONG
ParquetINT96 type converts nanoseconds
to Pinot INT64 type of milliseconds
INT64
LONG
INT32
INT
FLOAT
FLOAT
DOUBLE
DOUBLE
BINARY
BYTES
FIXED-LEN-BYTE-ARRAY
BYTES
DECIMAL
DOUBLE
ENUM
STRING
UTF8
STRING
REPEATED
MULTIVALUE/MAP (represented as MV
if parquet original type is LIST, then it is converted to MULTIVALUE column otherwise a MAP column.
For ParquetAvroRecordReader , you can refer to the Avro section above for the type conversions.
ORC record reader supports the following data types -
ORC Data Type
Java Data Type
BOOLEAN
String
SHORT
Integer
INT
Integer
LONG
Integer
FLOAT
Float
DOUBLE
Double
STRING
String
VARCHAR
String
CHAR
String
LIST
Object[]
MAP
Map<Object, Object>
DATE
Long
TIMESTAMP
Long
BINARY
byte[]
BYTE
Integer
In LIST and MAP types, the object should only belong to one of the data types supported by Pinot.
The reader requires a descriptor file to deserialize the data present in the files. You can generate the descriptor file (.desc) from the .proto file using the command -