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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Work logged] (BEAM-3708) Implement the portable lifted Combiner transforms in Java SDK
Date Mon, 02 Jul 2018 18:07:00 GMT

     [ https://issues.apache.org/jira/browse/BEAM-3708?focusedWorklogId=118313&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-118313
]

ASF GitHub Bot logged work on BEAM-3708:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 02/Jul/18 18:06
            Start Date: 02/Jul/18 18:06
    Worklog Time Spent: 10m 
      Work Description: lukecwik commented on a change in pull request #5795: [BEAM-3708]
Adding grouping table to Precombine step.
URL: https://github.com/apache/beam/pull/5795#discussion_r199303580
 
 

 ##########
 File path: sdks/java/harness/src/main/java/org/apache/beam/fn/harness/CombineRunners.java
 ##########
 @@ -51,17 +71,120 @@
     }
   }
 
-  static <KeyT, InputT, AccumT>
-      ThrowingFunction<KV<KeyT, InputT>, KV<KeyT, AccumT>> createPrecombineMapFunction(
-          String pTransformId, PTransform pTransform) throws IOException {
-    CombinePayload combinePayload = CombinePayload.parseFrom(pTransform.getSpec().getPayload());
-    CombineFn<InputT, AccumT, ?> combineFn =
-        (CombineFn)
-            SerializableUtils.deserializeFromByteArray(
-                combinePayload.getCombineFn().getSpec().getPayload().toByteArray(), "CombineFn");
+  private static class PrecombineRunner<KeyT, InputT, AccumT> {
+    private PipelineOptions options;
+    private CombineFn<InputT, AccumT, ?> combineFn;
+    private FnDataReceiver<WindowedValue<KV<KeyT, AccumT>>> output;
+    private Coder<KeyT> keyCoder;
+    private GroupingTable<WindowedValue<KeyT>, InputT, AccumT> groupingTable;
+    private Coder<AccumT> accumCoder;
+
+    PrecombineRunner(
+        PipelineOptions options,
+        CombineFn<InputT, AccumT, ?> combineFn,
+        FnDataReceiver<WindowedValue<KV<KeyT, AccumT>>> output,
+        Coder<KeyT> keyCoder,
+        Coder<AccumT> accumCoder) {
+      this.options = options;
+      this.combineFn = combineFn;
+      this.output = output;
+      this.keyCoder = keyCoder;
+      this.accumCoder = accumCoder;
+    }
+
+    void startBundle() {
+      groupingTable =
+          PrecombineGroupingTable.combiningAndSampling(
+              options, combineFn, keyCoder, accumCoder, 0.001 /*sizeEstimatorSampleRate*/);
+    }
+
+    void processElement(WindowedValue<KV<KeyT, InputT>> elem) throws Exception
{
+      groupingTable.put(
+          elem, (Object outputElem) -> output.accept((WindowedValue<KV<KeyT, AccumT>>)
outputElem));
+    }
+
+    void finishBundle() throws Exception {
+      groupingTable.flush(
+          (Object outputElem) -> output.accept((WindowedValue<KV<KeyT, AccumT>>)
outputElem));
 
 Review comment:
   ditto here, if you use a cast, you should be able to pass this in as a method reference
instead of using a lambda

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Issue Time Tracking
-------------------

    Worklog Id:     (was: 118313)
    Time Spent: 4h 50m  (was: 4h 40m)

> Implement the portable lifted Combiner transforms in Java SDK
> -------------------------------------------------------------
>
>                 Key: BEAM-3708
>                 URL: https://issues.apache.org/jira/browse/BEAM-3708
>             Project: Beam
>          Issue Type: Sub-task
>          Components: sdk-java-core, sdk-java-harness
>            Reporter: Daniel Oliveira
>            Assignee: Daniel Oliveira
>            Priority: Major
>              Labels: portability
>          Time Spent: 4h 50m
>  Remaining Estimate: 0h
>
> Lifted combines are split into separate parts with different URNs. These parts need
to be implemented in the Java SDK harness so that the SDK can actually execute them when
receiving Combine transforms with the corresponding URNs.



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