Reidddddd commented on code in PR #5323:
URL: https://github.com/apache/hbase/pull/5323#discussion_r1281492205
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hbase-server/src/main/java/org/apache/hadoop/hbase/io/MetricsIO.java:
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@@ -24,10 +24,12 @@
@InterfaceAudience.Private
public class MetricsIO {
+ private static volatile MetricsIO instance;
private final MetricsIOSource source;
private final MetricsIOWrapper wrapper;
- public MetricsIO(MetricsIOWrapper wrapper) {
+ // visible for testing only
+ MetricsIO(MetricsIOWrapper wrapper) {
Review Comment:
weird here, here is implementing a singleton, but there is still a public
constructor...
is it used somewhere? if not, could we just delete it.
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