org.apache.accumulo.core.client

Interface ConditionalWriter

public interface ConditionalWriter

ConditionalWriter provides the ability to do efficient, atomic read-modify-write operations on rows. These operations are performed on the tablet server while a row lock is held.

Since:

1.6.0

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	ConditionalWriter.Result
static class	ConditionalWriter.Status

Method Summary

Modifier and Type	Method and Description
void	close() release any resources (like threads pools) used by conditional writer
ConditionalWriter.Result	write(ConditionalMutation mutation) This method has the same thread safety guarantees as @link write(Iterator)
Iterator<ConditionalWriter.Result>	write(Iterator<ConditionalMutation> mutations) This method returns one result for each mutation passed to it.

Method Detail

write

Iterator<ConditionalWriter.Result> write(Iterator<ConditionalMutation> mutations)

This method returns one result for each mutation passed to it. This method is thread safe. Multiple threads can safely use a single conditional writer. Sharing a conditional writer between multiple threads may result in batching of request to tablet servers.

Returns:

Result for each mutation submitted. The mutations may still be processing in the background when this method returns, if so the iterator will block.

write

ConditionalWriter.Result write(ConditionalMutation mutation)

This method has the same thread safety guarantees as @link write(Iterator)

Returns:

Result for the submitted mutation

close

void close()

release any resources (like threads pools) used by conditional writer