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https://issues.apache.org/jira/browse/FLINK-3951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15343997#comment-15343997
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ASF GitHub Bot commented on FLINK-3951:
---------------------------------------
Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/2112#discussion_r68022062
--- Diff:
flink-core/src/main/java/org/apache/flink/metrics/HistogramStatistics.java ---
@@ -0,0 +1,135 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.metrics;
+
+import org.apache.flink.annotation.PublicEvolving;
+
+/**
+ * Histogram statistics represent the current snapshot of elements
recorded in the histogram.
+ *
+ * The histogram statistics allow to calculate values for quantiles, the
mean, the standard
+ * deviation, the minimum and the maximum.
+ */
+@PublicEvolving
+public abstract class HistogramStatistics {
+
+ /**
+ * Returns the value for the given quantile based on the represented
histogram statistics.
+ *
+ * @param quantile Quantile to calculate the value for
+ * @return Value for the given quantile
+ */
+ public abstract double getValue(double quantile);
--- End diff --
alright, getPercentile() (or getNthPercentile) doesn't really fit since the
argument is a long between 0 and 1. so getQuantile() would be more appropriate
i guess.
> Add Histogram Metric Type
> -------------------------
>
> Key: FLINK-3951
> URL: https://issues.apache.org/jira/browse/FLINK-3951
> Project: Flink
> Issue Type: Sub-task
> Components: Core
> Reporter: Stephan Ewen
> Assignee: Till Rohrmann
> Fix For: 1.1.0
>
>
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