org.apache.hadoop.hive.druid.serde

Class DruidSerDe

java.lang.Object

org.apache.hadoop.hive.serde2.AbstractSerDe

org.apache.hadoop.hive.druid.serde.DruidSerDe

All Implemented Interfaces:

Deserializer, Serializer

public class DruidSerDe
extends AbstractSerDe

DruidSerDe that is used to deserialize objects from a Druid data source.

Field Summary

Fields

Modifier and Type	Field and Description
protected static org.slf4j.Logger	LOG

Fields inherited from class org.apache.hadoop.hive.serde2.AbstractSerDe

configErrors

Constructor Summary

Constructors

Constructor and Description
DruidSerDe()

Method Summary

Modifier and Type	Method and Description
Object	deserialize(org.apache.hadoop.io.Writable writable) Deserialize an object out of a Writable blob.
ObjectInspector	getObjectInspector() Get the object inspector that can be used to navigate through the internal structure of the Object returned from deserialize(...).
SerDeStats	getSerDeStats() Returns statistics collected when serializing
Class<? extends org.apache.hadoop.io.Writable>	getSerializedClass() Returns the Writable class that would be returned by the serialize method.
void	initialize(org.apache.hadoop.conf.Configuration configuration, Properties properties) Initialize the HiveSerializer.
org.apache.hadoop.io.Writable	serialize(Object o, ObjectInspector objectInspector) Serialize an object by navigating inside the Object with the ObjectInspector.
boolean	shouldStoreFieldsInMetastore(Map<String,String> tableParams)
protected io.druid.query.metadata.metadata.SegmentAnalysis	submitMetadataRequest(String address, io.druid.query.metadata.metadata.SegmentMetadataQuery query)

Methods inherited from class org.apache.hadoop.hive.serde2.AbstractSerDe

getConfigurationErrors, initialize

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

LOG

protected static final org.slf4j.Logger LOG

Constructor Detail

DruidSerDe

public DruidSerDe()

Method Detail

initialize

public void initialize(org.apache.hadoop.conf.Configuration configuration,
                       Properties properties)
                throws SerDeException

Description copied from class: AbstractSerDe

Initialize the HiveSerializer.

Specified by:

initialize in interface Deserializer

Specified by:

initialize in interface Serializer

Specified by:

initialize in class AbstractSerDe

Parameters:

configuration - System properties. Can be null in compile time

properties - table properties

Throws:

SerDeException

submitMetadataRequest

protected io.druid.query.metadata.metadata.SegmentAnalysis submitMetadataRequest(String address,
                                                                                 io.druid.query.metadata.metadata.SegmentMetadataQuery query)
                                                                          throws SerDeException,
                                                                                 IOException

Throws:

SerDeException

IOException

getSerializedClass

public Class<? extends org.apache.hadoop.io.Writable> getSerializedClass()

Description copied from class: AbstractSerDe

Returns the Writable class that would be returned by the serialize method. This is used to initialize SequenceFile header.

Specified by:

getSerializedClass in interface Serializer

Specified by:

getSerializedClass in class AbstractSerDe

serialize

public org.apache.hadoop.io.Writable serialize(Object o,
                                               ObjectInspector objectInspector)
                                        throws SerDeException

Description copied from class: AbstractSerDe

Serialize an object by navigating inside the Object with the ObjectInspector. In most cases, the return value of this function will be constant since the function will reuse the Writable object. If the client wants to keep a copy of the Writable, the client needs to clone the returned value.

Specified by:

serialize in interface Serializer

Specified by:

serialize in class AbstractSerDe

Throws:

SerDeException

getSerDeStats

public SerDeStats getSerDeStats()

Description copied from class: AbstractSerDe

Returns statistics collected when serializing

Specified by:

getSerDeStats in interface Deserializer

Specified by:

getSerDeStats in interface Serializer

Specified by:

getSerDeStats in class AbstractSerDe

deserialize

public Object deserialize(org.apache.hadoop.io.Writable writable)
                   throws SerDeException

Description copied from class: AbstractSerDe

Deserialize an object out of a Writable blob. In most cases, the return value of this function will be constant since the function will reuse the returned object. If the client wants to keep a copy of the object, the client needs to clone the returned value by calling ObjectInspectorUtils.getStandardObject().

Specified by:

deserialize in interface Deserializer

Specified by:

deserialize in class AbstractSerDe

Parameters:

writable - The Writable object containing a serialized object

Returns:

A Java object representing the contents in the blob.

Throws:

SerDeException

getObjectInspector

public ObjectInspector getObjectInspector()

Description copied from class: AbstractSerDe

Get the object inspector that can be used to navigate through the internal structure of the Object returned from deserialize(...).

Specified by:

getObjectInspector in interface Deserializer

Specified by:

getObjectInspector in class AbstractSerDe

shouldStoreFieldsInMetastore

public boolean shouldStoreFieldsInMetastore(Map<String,String> tableParams)

Overrides:

shouldStoreFieldsInMetastore in class AbstractSerDe

Returns:

Whether the SerDe that can store schema both inside and outside of metastore does, in fact, store it inside metastore, based on table parameters.