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https://issues.apache.org/jira/browse/FLINK-2292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14620810#comment-14620810
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ASF GitHub Bot commented on FLINK-2292:
---------------------------------------
Github user StephanEwen commented on a diff in the pull request:
https://github.com/apache/flink/pull/896#discussion_r34274983
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/accumulators/AccumulatorRegistry.java
---
@@ -0,0 +1,140 @@
+/*
+ * 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.runtime.accumulators;
+
+import org.apache.flink.api.common.JobID;
+import org.apache.flink.api.common.accumulators.Accumulator;
+import org.apache.flink.api.common.accumulators.LongCounter;
+import org.apache.flink.runtime.executiongraph.ExecutionAttemptID;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+
+
+/**
+ * Main accumulator registry which encapsulates internal and user-defined
accumulators.
+ */
+public class AccumulatorRegistry {
--- End diff --
I do not understand the differentiation between the implementation of the
`Internal` and `External` registry. From the usage pattern, both are accesses
and initialized with a hash map. One time the hash map is created by the
caller, once by the registry. I have not found a place where it would not work
that the registry always creates the map immediately.
> Report accumulators periodically while job is running
> -----------------------------------------------------
>
> Key: FLINK-2292
> URL: https://issues.apache.org/jira/browse/FLINK-2292
> Project: Flink
> Issue Type: Sub-task
> Components: JobManager, TaskManager
> Reporter: Maximilian Michels
> Assignee: Maximilian Michels
> Fix For: 0.10
>
>
> Accumulators should be sent periodically, as part of the heartbeat that sends
> metrics. This allows them to be updated in real time.
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