Github user HeartSaVioR commented on the issue:
https://github.com/apache/storm/pull/2041
I think thread-unsafety of metrics is by design. They're guaranteed to be
called only a thread at once, so unless we get or update the value on other
than Spout or Bolt's event thread, they should be safe. Updating them is
occurred from critical path, and metrics doesn't need to have synchronization
overhead with current design.
Btw, thread-unsafety on metrics is why I gave up metrics aggregation for
worker side. Instead of struggling about metrics more, I'm just waiting for
Metrics V2.
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