com.facebook.presto.spi

Interface ConnectorPageSink

All Known Implementing Classes:

ClassLoaderSafeConnectorPageSink

public interface ConnectorPageSink

Field Summary

Fields

Modifier and Type	Field and Description
static CompletableFuture<?>	NOT_BLOCKED

Method Summary

Modifier and Type	Method and Description
void	abort()
CompletableFuture<?>	appendPage(Page page) Returns a future that will be completed when the page sink can accept more pages.
CompletableFuture<Collection<io.airlift.slice.Slice>>	finish() Notifies the connector that no more pages will be appended and returns connector-specific information that will be sent to the coordinator to complete the write operation.
default long	getCompletedBytes() Gets the number of output bytes written by this page source so far.
default long	getSystemMemoryUsage() Get the total memory that needs to be reserved in the general memory pool.
default long	getValidationCpuNanos() ConnectorPageSink can provide optional validation to check the data is correctly consumed by connector (e.g.

Field Detail

NOT_BLOCKED

static final CompletableFuture<?> NOT_BLOCKED

Method Detail

getCompletedBytes

default long getCompletedBytes()

Gets the number of output bytes written by this page source so far. If size is not available, this method should return zero.

getSystemMemoryUsage

default long getSystemMemoryUsage()

Get the total memory that needs to be reserved in the general memory pool. This memory should include any buffers, etc. that are used for reading data.

Returns:

the memory used so far in table read

getValidationCpuNanos

default long getValidationCpuNanos()

ConnectorPageSink can provide optional validation to check the data is correctly consumed by connector (e.g. output table has the correct data).

This method returns the CPU spent on validation, if any.

appendPage

CompletableFuture<?> appendPage(Page page)

Returns a future that will be completed when the page sink can accept more pages. If the page sink can accept more pages immediately, this method should return NOT_BLOCKED.

finish

CompletableFuture<Collection<io.airlift.slice.Slice>> finish()

Notifies the connector that no more pages will be appended and returns connector-specific information that will be sent to the coordinator to complete the write operation. This method may be called immediately after the previous call to appendPage(com.facebook.presto.common.Page) (even if the returned future is not complete).

abort

void abort()