m-trieu commented on code in PR #29445:
URL: https://github.com/apache/beam/pull/29445#discussion_r1394843156
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sdks/java/core/src/main/java/org/apache/beam/sdk/util/HistogramData.java:
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@@ -47,6 +47,9 @@ public class HistogramData implements Serializable {
private long numTopRecords;
private long numBottomRecords;
+ private double sum_of_squared_deviations;
Review Comment:
mark as with `@GuardedBy("this")` unless there are non threadsafe callers
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