HDFS-16233. Do not use exception handler to implement copy-on-write for EnumCounters. (#3468)
(cherry picked from commit 87632bbacf
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@ -23,7 +23,6 @@ import org.apache.hadoop.fs.StorageType;
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import org.apache.hadoop.hdfs.protocol.HdfsConstants;
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import org.apache.hadoop.hdfs.util.ConstEnumCounters;
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import org.apache.hadoop.hdfs.util.EnumCounters;
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import org.apache.hadoop.hdfs.util.ConstEnumCounters.ConstEnumException;
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import java.util.function.Consumer;
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@ -57,14 +56,10 @@ public class QuotaCounts {
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*/
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static <T extends Enum<T>> EnumCounters<T> modify(EnumCounters<T> counter,
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Consumer<EnumCounters<T>> action) {
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try {
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action.accept(counter);
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} catch (ConstEnumException cee) {
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// We don't call clone here because ConstEnumCounters.clone() will return
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// an object of class ConstEnumCounters. We want EnumCounters.
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if (counter instanceof ConstEnumCounters) {
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counter = counter.deepCopyEnumCounter();
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action.accept(counter);
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}
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action.accept(counter);
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return counter;
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}
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