org.apache.pig.piggybank.storage
Class HiveColumnarStorage

java.lang.Object
  org.apache.pig.LoadFunc
      org.apache.pig.FileInputLoadFunc
          org.apache.pig.builtin.PigStorage
              org.apache.pig.piggybank.storage.HiveColumnarStorage

All Implemented Interfaces:

LoadMetadata, LoadPushDown, OrderedLoadFunc, OverwritableStoreFunc, StoreFuncInterface, StoreMetadata

public class HiveColumnarStorage
extends PigStorage

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.pig.LoadPushDown

LoadPushDown.OperatorSet, LoadPushDown.RequiredField, LoadPushDown.RequiredFieldList, LoadPushDown.RequiredFieldResponse

Field Summary

Fields inherited from class org.apache.pig.builtin.PigStorage

caster, in, mLog, mRequiredColumns, schema, signature, writer

Constructor Summary

HiveColumnarStorage()

Method Summary

void	checkSchema(ResourceSchema s) Set the schema for data to be stored.
org.apache.hadoop.mapreduce.OutputFormat	getOutputFormat() Return the OutputFormat associated with StoreFuncInterface.
void	putField(OutputStream out, Object field)
void	putNext(Tuple t) Write a tuple to the data store.
void	setStoreLocation(String location, org.apache.hadoop.mapreduce.Job job) Communicate to the storer the location where the data needs to be stored.

Methods inherited from class org.apache.pig.builtin.PigStorage

cleanupOnFailure, cleanupOnSuccess, cleanupOutput, equals, equals, getFeatures, getInputFormat, getNext, getPartitionKeys, getSchema, getStatistics, hashCode, prepareToRead, prepareToWrite, pushProjection, readField, relToAbsPathForStoreLocation, setLocation, setPartitionFilter, setStoreFuncUDFContextSignature, setUDFContextSignature, shouldOverwrite, storeSchema, storeStatistics

Methods inherited from class org.apache.pig.FileInputLoadFunc

getSplitComparable

Methods inherited from class org.apache.pig.LoadFunc

getAbsolutePath, getLoadCaster, getPathStrings, join, relativeToAbsolutePath, warn

Methods inherited from class java.lang.Object

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

Constructor Detail

HiveColumnarStorage

public HiveColumnarStorage()

Method Detail

getOutputFormat

public org.apache.hadoop.mapreduce.OutputFormat getOutputFormat()

Description copied from interface: StoreFuncInterface

Return the OutputFormat associated with StoreFuncInterface. This will be called on the front end during planning and on the backend during execution.

Specified by:

getOutputFormat in interface StoreFuncInterface

Overrides:

getOutputFormat in class PigStorage

Returns:

the OutputFormat associated with StoreFuncInterface

setStoreLocation

public void setStoreLocation(String location,
                             org.apache.hadoop.mapreduce.Job job)
                      throws IOException

Description copied from interface: StoreFuncInterface

Communicate to the storer the location where the data needs to be stored. The location string passed to the StoreFuncInterface here is the return value of StoreFuncInterface.relToAbsPathForStoreLocation(String, Path) This method will be called in the frontend and backend multiple times. Implementations should bear in mind that this method is called multiple times and should ensure there are no inconsistent side effects due to the multiple calls. StoreFuncInterface.checkSchema(ResourceSchema) will be called before any call to StoreFuncInterface.setStoreLocation(String, Job).

Specified by:

setStoreLocation in interface StoreFuncInterface

Overrides:

setStoreLocation in class PigStorage

Parameters:

location - Location returned by StoreFuncInterface.relToAbsPathForStoreLocation(String, Path)

job - The Job object

Throws:

IOException - if the location is not valid.

checkSchema

public void checkSchema(ResourceSchema s)
                 throws IOException

Description copied from interface: StoreFuncInterface

Set the schema for data to be stored. This will be called on the front end during planning if the store is associated with a schema. A Store function should implement this function to check that a given schema is acceptable to it. For example, it can check that the correct partition keys are included; a storage function to be written directly to an OutputFormat can make sure the schema will translate in a well defined way.

Specified by:

checkSchema in interface StoreFuncInterface

Overrides:

checkSchema in class PigStorage

Parameters:

s - to be checked

Throws:

IOException - if this schema is not acceptable. It should include a detailed error message indicating what is wrong with the schema.

putNext

public void putNext(Tuple t)
             throws IOException

Description copied from interface: StoreFuncInterface

Write a tuple to the data store.

Specified by:

putNext in interface StoreFuncInterface

Overrides:

putNext in class PigStorage

Parameters:

t - the tuple to store.

Throws:

IOException - if an exception occurs during the write

putField

public void putField(OutputStream out,
                     Object field)
              throws IOException

Throws:

IOException