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MAPREDUCE-7437. MR Fetcher class to use an AtomicInteger to generate IDs. (#5579)

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...as until now it wasn't thread safe

Contributed by Steve Loughran
This commit is contained in:
Steve Loughran 2023-04-25 19:53:40 +01:00
parent d7d36b9d2a
commit 0b56be3ca4
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1 changed files with 3 additions and 2 deletions
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hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/task/reduce/Fetcher.java
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@ -31,6 +31,7 @@
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.atomic.AtomicInteger;
import javax.crypto.SecretKey;
import javax.net.ssl.HttpsURLConnection;
@ -88,7 +89,7 @@ private enum ShuffleErrors{IO_ERROR, WRONG_LENGTH, BAD_ID, WRONG_MAP,
protected final ShuffleClientMetrics metrics;
protected final ExceptionReporter exceptionReporter;
protected final int id;
private static int nextId = 0;
private static final AtomicInteger NEXT_ID = new AtomicInteger(0);
protected final int reduce;
private final int connectionTimeout;
@ -115,7 +116,7 @@ public Fetcher(JobConf job, TaskAttemptID reduceId,
Reporter reporter, ShuffleClientMetrics metrics,
ExceptionReporter exceptionReporter, SecretKey shuffleKey) {
this(job, reduceId, scheduler, merger, reporter, metrics,
exceptionReporter, shuffleKey, ++nextId);
exceptionReporter, shuffleKey, NEXT_ID.incrementAndGet());
}
@VisibleForTesting