org.apache.phoenix.pig.udf

Class ReserveNSequence

java.lang.Object

org.apache.pig.EvalFunc<Long>

org.apache.phoenix.pig.udf.ReserveNSequence

public class ReserveNSequence
extends org.apache.pig.EvalFunc<Long>

UDF to Reserve a chunk of numbers for a given sequence Note: The way this UDF is invoked we open a new connection for every tuple row. The UDF will not perform well on large datasets as it involves creating a new connection for every tuple row

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.pig.EvalFunc

org.apache.pig.EvalFunc.SchemaType

Field Summary

Fields

Modifier and Type	Field and Description
static String	EMPTY_SEQUENCE_NAME_MESSAGE
static String	EMPTY_ZK_MESSAGE
static String	INVALID_NUMBER_MESSAGE
static String	INVALID_TUPLE_MESSAGE

Fields inherited from class org.apache.pig.EvalFunc

log, pigLogger, reporter, returnType

Constructor Summary

Constructors

Constructor and Description
ReserveNSequence(String zkQuorum, String tenantId)

Method Summary

Modifier and Type	Method and Description
Long	exec(org.apache.pig.data.Tuple input) Reserve N next sequences for a sequence name.
void	finish() Cleanup to be performed at the end.

Methods inherited from class org.apache.pig.EvalFunc

getArgToFuncMapping, getCacheFiles, getInputSchema, getLogger, getPigLogger, getReporter, getReturnType, getSchemaName, getSchemaType, isAsynchronous, outputSchema, progress, setInputSchema, setPigLogger, setReporter, setUDFContextSignature, warn

Methods inherited from class java.lang.Object

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

Field Detail

INVALID_TUPLE_MESSAGE

public static final String INVALID_TUPLE_MESSAGE

See Also:

Constant Field Values

EMPTY_SEQUENCE_NAME_MESSAGE

public static final String EMPTY_SEQUENCE_NAME_MESSAGE

See Also:

Constant Field Values

EMPTY_ZK_MESSAGE

public static final String EMPTY_ZK_MESSAGE

See Also:

Constant Field Values

INVALID_NUMBER_MESSAGE

public static final String INVALID_NUMBER_MESSAGE

See Also:

Constant Field Values

Constructor Detail

ReserveNSequence

public ReserveNSequence(@NonNull
                        String zkQuorum,
                        @Nullable
                        String tenantId)

Method Detail

exec

public Long exec(org.apache.pig.data.Tuple input)
          throws IOException

Reserve N next sequences for a sequence name. N is the first field in the tuple. Sequence name is the second field in the tuple zkquorum is the third field in the tuple

Specified by:

exec in class org.apache.pig.EvalFunc<Long>

Throws:

IOException

finish

public void finish()

Cleanup to be performed at the end. Close connection

Overrides:

finish in class org.apache.pig.EvalFunc<Long>