kudu::client::KuduPartitioner Class Reference

#include <client.h>

Public Member Functions
int	NumPartitions () const
Status	PartitionRow (const KuduPartialRow &row, int *partition)

Friends
class	KuduPartitionerBuilder

Detailed Description

A KuduPartitioner allows clients to determine the target partition of a row without actually performing a write. The set of partitions is eagerly fetched when the KuduPartitioner is constructed so that the actual partitioning step can be performed synchronously without any network trips.

Note

Because this operates on a metadata snapshot retrieved at construction time, it will not reflect any metadata changes to the table that have occurred since its creation.

Warning

This class is not thread-safe.

Member Function Documentation

int kudu::client::KuduPartitioner::NumPartitions

(

)

const

Return the number of partitions known by this partitioner. The partition indices returned by PartitionRow are guaranteed to be less than this value.

Status kudu::client::KuduPartitioner::PartitionRow	(	const KuduPartialRow &	row,
		int *	partition
	)

Determine the partition index that the given row falls into.

Parameters

[in]	row	The row to be partitioned.
[out]	partition	The resulting partition index, or -1 if the row falls into a non-covered range. The result will be less than NumPartitioons().

Returns

Status OK if successful. May return a bad Status if the provided row does not have all columns of the partition key set.

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The documentation for this class was generated from the following file:

• include/kudu/client/client.h