NihalJain commented on code in PR #5323:
URL: https://github.com/apache/hbase/pull/5323#discussion_r1270304449
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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 MetricsIO instance;
Review Comment:
> This probably should be volatile. Below in your new method, you should do
synchronization if it's null so it only gets instantiated once. Example:
https://github.com/apache/hbase/blob/master/hbase-client/src/main/java/org/apache/hadoop/hbase/ipc/NettyRpcClientConfigHelper.java#L87
Update the logic as per suggestion.
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