wsry commented on a change in pull request #13924:
URL: https://github.com/apache/flink/pull/13924#discussion_r601523381
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File path:
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/SortMergeSubpartitionReader.java
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@@ -19,154 +19,182 @@
package org.apache.flink.runtime.io.network.partition;
import org.apache.flink.core.memory.MemorySegment;
-import org.apache.flink.core.memory.MemorySegmentFactory;
import org.apache.flink.runtime.io.network.buffer.Buffer;
import org.apache.flink.runtime.io.network.buffer.BufferRecycler;
import
org.apache.flink.runtime.io.network.partition.ResultSubpartition.BufferAndBacklog;
-import org.apache.flink.util.ExceptionUtils;
-import org.apache.flink.util.IOUtils;
import javax.annotation.Nullable;
+import javax.annotation.concurrent.GuardedBy;
import java.io.IOException;
import java.util.ArrayDeque;
import java.util.Queue;
+import static org.apache.flink.util.Preconditions.checkArgument;
import static org.apache.flink.util.Preconditions.checkNotNull;
-import static org.apache.flink.util.Preconditions.checkState;
/** Subpartition data reader for {@link SortMergeResultPartition}. */
-public class SortMergeSubpartitionReader implements ResultSubpartitionView,
BufferRecycler {
+public class SortMergeSubpartitionReader
+ implements ResultSubpartitionView,
Comparable<SortMergeSubpartitionReader> {
- private static final int NUM_READ_BUFFERS = 2;
+ private final Object lock = new Object();
- /** Target {@link SortMergeResultPartition} to read data from. */
- private final SortMergeResultPartition partition;
+ /**
+ * Corresponding {@link SortMergeResultPartitionReadScheduler} of the
target result partition.
+ */
+ private final SortMergeResultPartitionReadScheduler readScheduler;
/** Listener to notify when data is available. */
private final BufferAvailabilityListener availabilityListener;
- /** Unmanaged memory used as read buffers. */
- private final Queue<MemorySegment> readBuffers = new ArrayDeque<>();
-
- /** Buffers read by the file reader. */
+ /** Buffers already read which can be consumed by netty thread. */
+ @GuardedBy("lock")
private final Queue<Buffer> buffersRead = new ArrayDeque<>();
/** File reader used to read buffer from. */
private final PartitionedFileReader fileReader;
- /** Number of remaining non-event buffers to read. */
+ /** Number of remaining non-event buffers in the buffer queue. */
+ @GuardedBy("lock")
private int dataBufferBacklog;
/** Whether this reader is released or not. */
+ @GuardedBy("lock")
private boolean isReleased;
+ /** Cause of failure which should be propagated to the consumer. */
+ @GuardedBy("lock")
+ private Throwable failureCause;
+
/** Sequence number of the next buffer to be sent to the consumer. */
private int sequenceNumber;
public SortMergeSubpartitionReader(
- int subpartitionIndex,
- int dataBufferBacklog,
- int bufferSize,
- SortMergeResultPartition partition,
+ SortMergeResultPartitionReadScheduler readScheduler,
Review comment:
I will add a separated test for this class.
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