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HDFS-16137.Improve the comments related to FairCallQueue#queues. (#3226)

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Co-authored-by: zhujianghua <zhujianghua@zhujianghuadeMacBook-Pro.local>
Reviewed-by: Viraj Jasani <vjasani@apache.org>
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jianghuazhu 2021-07-28 18:18:04 +08:00 committed by GitHub
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commit fd13970d94
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1 changed files with 7 additions and 2 deletions
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hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/FairCallQueue.java
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@ -25,6 +25,7 @@
import java.util.Iterator;
import java.util.AbstractQueue;
import java.util.HashMap;
import java.util.List;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.Semaphore;
@ -58,8 +59,12 @@ public class FairCallQueue<E extends Schedulable> extends AbstractQueue<E>
public static final Logger LOG = LoggerFactory.getLogger(FairCallQueue.class);
/* The queues */
private final ArrayList<BlockingQueue<E>> queues;
/**
* Save the queue data of multiple priority strategies.
* Usually the number of queue data and priority strategies saved
* is the same.
*/
private final List<BlockingQueue<E>> queues;
/* Track available permits for scheduled objects. All methods that will
* mutate a subqueue must acquire or release a permit on the semaphore.