{"action":"created","comment":{"url":"https://api.github.com/repos/apache/storm/pulls/comments/70800422","id":70800422,"diff_hunk":"@@ -0,0 +1,61 @@\n+package org.apache.storm.metric.util;\n+\n+import org.apache.storm.metric.api.IMetricsConsumer;\n+import org.slf4j.Logger;\n+import org.slf4j.LoggerFactory;\n+\n+import java.io.Serializable;\n+import java.util.ArrayList;\n+import java.util.Collection;\n+import java.util.Collections;\n+import java.util.List;\n+import java.util.Map;\n+\n+public class DataPointPopulator implements Serializable {\n+  public static final Logger LOG = LoggerFactory.getLogger(DataPointPopulator.class);\n+\n+  private final boolean populateMapType;\n+  private final String metricNameSeparator;\n+\n+  public DataPointPopulator(boolean populateMapType, String metricNameSeparator) {\n+    this.populateMapType = populateMapType;\n+    this.metricNameSeparator = metricNameSeparator;\n+  }\n+\n+  public Collection<IMetricsConsumer.DataPoint> populateDataPoints(Collection<IMetricsConsumer.DataPoint> dataPoints) {\n+    if (!populateMapType) {\n+      return dataPoints;\n+    }\n+\n+    List<IMetricsConsumer.DataPoint> populatedDataPoints = new ArrayList<>();\n+\n+    for (IMetricsConsumer.DataPoint dataPoint : dataPoints) {\n+      populatedDataPoints.addAll(populateDataPoint(dataPoint));\n+    }\n+\n+    return populatedDataPoints;\n+  }\n+\n+  public Collection<IMetricsConsumer.DataPoint> populateDataPoint(IMetricsConsumer.DataPoint dataPoint) {\n+    if (!populateMapType) {\n+      return Collections.singletonList(dataPoint);\n+    }\n+\n+    List<IMetricsConsumer.DataPoint> dataPoints = new ArrayList<>();\n+\n+    if (dataPoint.value == null) {\n+      LOG.warn(\"Data point with name \" + dataPoint.name + \" is null. Discarding.\" + dataPoint.name);\n+    } else if (dataPoint.value instanceof Map) {\n+      Map<String, Object> dataMap = (Map<String, Object>) dataPoint.value;","path":"storm-core/src/jvm/org/apache/storm/metric/util/DataPointPopulator.java","position":49,"original_position":49,"commit_id":"31cba7f69a3ad7220eb9036bdd28a356cbb9c7df","original_commit_id":"31cba7f69a3ad7220eb9036bdd28a356cbb9c7df","user":{"login":"HeartSaVioR","id":1317309,"avatar_url":"https://avatars.githubusercontent.com/u/1317309?v=3","gravatar_id":"","url":"https://api.github.com/users/HeartSaVioR","html_url":"https://github.com/HeartSaVioR","followers_url":"https://api.github.com/users/HeartSaVioR/followers","following_url":"https://api.github.com/users/HeartSaVioR/following{/other_user}","gists_url":"https://api.github.com/users/HeartSaVioR/gists{/gist_id}","starred_url":"https://api.github.com/users/HeartSaVioR/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/HeartSaVioR/subscriptions","organizations_url":"https://api.github.com/users/HeartSaVioR/orgs","repos_url":"https://api.github.com/users/HeartSaVioR/repos","events_url":"https://api.github.com/users/HeartSaVioR/events{/privacy}","received_events_url":"https://api.github.com/users/HeartSaVioR/received_events","type":"User","site_admin":false},"body":"Yeah good point. Will address.","created_at":"2016-07-14T13:01:39Z","updated_at":"2016-07-14T13:01:39Z","html_url":"https://github.com/apache/storm/pull/1560#discussion_r70800422","pull_request_url":"https://api.github.com/repos/apache/storm/pulls/1560","_links":{"self":{"href":"https://api.github.com/repos/apache/storm/pulls/comments/70800422"},"html":{"href":"https://github.com/apache/storm/pull/1560#discussion_r70800422"},"pull_request":{"href":"https://api.github.com/repos/apache/storm/pulls/1560"}}},"pull_request":{"url":"https://api.github.com/repos/apache/storm/pulls/1560","id":77302180,"html_url":"https://github.com/apache/storm/pull/1560","diff_url":"https://github.com/apache/storm/pull/1560.diff","patch_url":"https://github.com/apache/storm/pull/1560.patch","issue_url":"https://api.github.com/repos/apache/storm/issues/1560","number":1560,"state":"open","locked":false,"title":"STORM-1966 Expand metric having Map type as value into multiple metrics based on entries","user":{"login":"HeartSaVioR","id":1317309,"avatar_url":"https://avatars.githubusercontent.com/u/1317309?v=3","gravatar_id":"","url":"https://api.github.com/users/HeartSaVioR","html_url":"https://github.com/HeartSaVioR","followers_url":"https://api.github.com/users/HeartSaVioR/followers","following_url":"https://api.github.com/users/HeartSaVioR/following{/other_user}","gists_url":"https://api.github.com/users/HeartSaVioR/gists{/gist_id}","starred_url":"https://api.github.com/users/HeartSaVioR/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/HeartSaVioR/subscriptions","organizations_url":"https://api.github.com/users/HeartSaVioR/orgs","repos_url":"https://api.github.com/users/HeartSaVioR/repos","events_url":"https://api.github.com/users/HeartSaVioR/events{/privacy}","received_events_url":"https://api.github.com/users/HeartSaVioR/received_events","type":"User","site_admin":false},"body":"PR for 1.x: #1561 \r\n\r\n* populate metric before applying filter so that filter can play with populated metrics\r\n* add relevant configs to metrics consumer registration and describe them to storm.config.yaml\r\n* add unit test\r\n\r\nPlease refer https://issues.apache.org/jira/browse/STORM-1966 for more 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