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/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.trino.execution.buffer;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.errorprone.annotations.ThreadSafe;
import io.airlift.log.Logger;
import io.airlift.slice.Slice;
import io.airlift.units.DataSize;
import io.trino.execution.StateMachine;
import io.trino.memory.context.LocalMemoryContext;
import io.trino.spi.exchange.ExchangeSink;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.atomic.AtomicLong;
import java.util.function.Supplier;
import static com.google.common.base.Preconditions.checkState;
import static com.google.common.util.concurrent.Futures.immediateVoidFuture;
import static io.airlift.concurrent.MoreFutures.toListenableFuture;
import static io.trino.execution.buffer.PagesSerdeUtil.getSerializedPagePositionCount;
import static io.trino.execution.buffer.PagesSerdeUtil.getSerializedPageUncompressedSizeInBytes;
import static java.util.Objects.requireNonNull;
@ThreadSafe
public class SpoolingExchangeOutputBuffer
implements OutputBuffer
{
private static final Logger log = Logger.get(SpoolingExchangeOutputBuffer.class);
private final OutputBufferStateMachine stateMachine;
private volatile SpoolingOutputBuffers outputBuffers;
// This field is not final to allow releasing the memory retained by the ExchangeSink instance.
// It is modified (assigned to null) when the OutputBuffer is destroyed (either finished or aborted).
// It doesn't have to be declared as volatile as the nullification of this variable doesn't have to be immediately visible to other threads.
// However since the abort can be triggered at any moment of time this variable has to be accessed in a safe way (avoiding "check-then-use").
private ExchangeSink exchangeSink;
private final Supplier memoryContextSupplier;
private final AtomicLong peakMemoryUsage = new AtomicLong();
private final AtomicLong totalPagesAdded = new AtomicLong();
private final AtomicLong totalRowsAdded = new AtomicLong();
private final SpoolingOutputStats outputStats;
public SpoolingExchangeOutputBuffer(
OutputBufferStateMachine stateMachine,
SpoolingOutputBuffers outputBuffers,
ExchangeSink exchangeSink,
Supplier memoryContextSupplier)
{
this.stateMachine = requireNonNull(stateMachine, "stateMachine is null");
this.outputBuffers = requireNonNull(outputBuffers, "outputBuffers is null");
// this assignment is expected to be followed by an assignment of a final field to ensure safe publication
this.exchangeSink = requireNonNull(exchangeSink, "exchangeSink is null");
this.memoryContextSupplier = requireNonNull(memoryContextSupplier, "memoryContextSupplier is null");
stateMachine.noMoreBuffers();
outputStats = new SpoolingOutputStats(outputBuffers.getOutputPartitionCount());
}
@Override
public OutputBufferInfo getInfo()
{
BufferState state = stateMachine.getState();
LocalMemoryContext memoryContext = getSystemMemoryContextOrNull();
return new OutputBufferInfo(
"EXTERNAL",
state,
false,
state.canAddPages(),
memoryContext == null ? 0 : memoryContext.getBytes(),
totalPagesAdded.get(),
totalRowsAdded.get(),
totalPagesAdded.get(),
Optional.empty(),
Optional.empty(),
outputStats.getFinalSnapshot());
}
@Override
public BufferState getState()
{
return stateMachine.getState();
}
@Override
public double getUtilization()
{
return 0;
}
@Override
public OutputBufferStatus getStatus()
{
// do not grab lock to acquire outputBuffers to avoid delaying TaskStatus response
OutputBufferStatus.Builder result = OutputBufferStatus.builder(outputBuffers.getVersion());
ExchangeSink sink = exchangeSink;
if (sink != null) {
result.setExchangeSinkInstanceHandleUpdateRequired(sink.isHandleUpdateRequired());
}
return result.build();
}
@Override
public void addStateChangeListener(StateMachine.StateChangeListener stateChangeListener)
{
stateMachine.addStateChangeListener(stateChangeListener);
}
@Override
public synchronized void setOutputBuffers(OutputBuffers newOutputBuffers)
{
requireNonNull(newOutputBuffers, "newOutputBuffers is null");
// ignore buffers added after query finishes, which can happen when a query is canceled
// also ignore old versions, which is normal
if (stateMachine.getState().isTerminal() || outputBuffers.getVersion() >= newOutputBuffers.getVersion()) {
return;
}
// no more buffers can be added but verify this is valid state change
outputBuffers.checkValidTransition(newOutputBuffers);
ExchangeSink sink = exchangeSink;
if (sink != null) {
sink.updateHandle(((SpoolingOutputBuffers) newOutputBuffers).getExchangeSinkInstanceHandle());
}
// assign output buffers only after updating the sink to avoid triggering an extra update
outputBuffers = (SpoolingOutputBuffers) newOutputBuffers;
}
@Override
public ListenableFuture get(PipelinedOutputBuffers.OutputBufferId bufferId, long token, DataSize maxSize)
{
throw new UnsupportedOperationException();
}
@Override
public void acknowledge(PipelinedOutputBuffers.OutputBufferId bufferId, long token)
{
throw new UnsupportedOperationException();
}
@Override
public void destroy(PipelinedOutputBuffers.OutputBufferId bufferId)
{
throw new UnsupportedOperationException();
}
@Override
public ListenableFuture isFull()
{
ExchangeSink sink = exchangeSink;
if (sink != null) {
return toListenableFuture(sink.isBlocked());
}
return immediateVoidFuture();
}
@Override
public void enqueue(List pages)
{
enqueue(0, pages);
}
@Override
public void enqueue(int partition, List pages)
{
requireNonNull(pages, "pages is null");
// ignore pages after "no more pages" is set
// this can happen with a limit query
if (!stateMachine.getState().canAddPages()) {
return;
}
ExchangeSink sink = exchangeSink;
checkState(sink != null, "exchangeSink is null");
long dataSizeInBytes = 0;
for (Slice page : pages) {
dataSizeInBytes += getSerializedPageUncompressedSizeInBytes(page);
sink.add(partition, page);
totalRowsAdded.addAndGet(getSerializedPagePositionCount(page));
}
updateMemoryUsage(sink.getMemoryUsage());
totalPagesAdded.addAndGet(pages.size());
outputStats.update(partition, dataSizeInBytes);
}
@Override
public void setNoMorePages()
{
if (!stateMachine.noMorePages()) {
return;
}
outputStats.finish();
ExchangeSink sink = exchangeSink;
if (sink == null) {
// abort might've released the sink in a meantime
return;
}
sink.finish().whenComplete((value, failure) -> {
if (failure != null) {
stateMachine.fail(failure);
}
else {
stateMachine.finish();
}
exchangeSink = null;
forceFreeMemory();
});
}
@Override
public void destroy()
{
// Abort the buffer if it hasn't been finished. This is possible when a task is cancelled early by the coordinator.
// Task cancellation is not supported (and not expected to be requested by the coordinator when the spooling exchange
// is in use) as the task output is expected to be deterministic.
// In a scenario when due to a bug in coordinator logic a cancellation is requested it is better to invalidate the sink
// to avoid publishing incomplete data to the downstream stage that could potentially cause a correctness problem
abort();
}
@Override
public void abort()
{
if (!stateMachine.abort()) {
return;
}
ExchangeSink sink = exchangeSink;
if (sink == null) {
return;
}
sink.abort().whenComplete((value, failure) -> {
if (failure != null) {
log.warn(failure, "Error aborting exchange sink");
}
exchangeSink = null;
forceFreeMemory();
});
}
@Override
public long getPeakMemoryUsage()
{
return peakMemoryUsage.get();
}
@Override
public Optional getFailureCause()
{
return stateMachine.getFailureCause();
}
private void updateMemoryUsage(long bytes)
{
LocalMemoryContext context = getSystemMemoryContextOrNull();
if (context != null) {
context.setBytes(bytes);
}
updatePeakMemoryUsage(bytes);
}
private void updatePeakMemoryUsage(long bytes)
{
while (true) {
long currentValue = peakMemoryUsage.get();
if (currentValue >= bytes) {
return;
}
if (peakMemoryUsage.compareAndSet(currentValue, bytes)) {
return;
}
}
}
private void forceFreeMemory()
{
LocalMemoryContext context = getSystemMemoryContextOrNull();
if (context != null) {
context.close();
}
}
private LocalMemoryContext getSystemMemoryContextOrNull()
{
try {
return memoryContextSupplier.get();
}
catch (RuntimeException ignored) {
// This is possible with races, e.g., a task is created and then immediately aborted,
// so that the task context hasn't been created yet (as a result there's no memory context available).
return null;
}
}
}
