[jira] [Work logged] (BEAM-6730) Expose Java transforms (specifically IO) in other SDKs

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-6730?focusedWorklogId=206286&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-206286 ]

ASF GitHub Bot logged work on BEAM-6730:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 01/Mar/19 07:43
            Start Date: 01/Mar/19 07:43
    Worklog Time Spent: 10m 
      Work Description: angoenka commented on pull request #7875: [BEAM-6730] Expose Java SDK's GenerateSequence in Python
URL: https://github.com/apache/beam/pull/7875#discussion_r261490360
 
 

 ##########
 File path: model/pipeline/src/main/proto/external_transforms.proto
 ##########
 @@ -0,0 +1,52 @@
+/*
+ * 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.
+ */
+
+/*
+ * Protocol Buffers describing the external transforms available.
+ */
+
+syntax = "proto3";
+
+package org.apache.beam.model.pipeline.v1;
+
+option go_package = "pipeline_v1";
+option java_package = "org.apache.beam.model.pipeline.v1";
+option java_outer_classname = "ExternalTransforms";
+
+import "beam_runner_api.proto";
+import "google/protobuf/duration.proto";
+
+// Payload for Java's GenerateSequence transform
+message GenerateSequencePayload {
 
 Review comment:
   Instead of having a well defined proto message for the transform, can we have a more generic message like
   ```
   {
   string urn;
   string properties; // JSON or some other standard serialization mechanism. The expansion service can deserialize it or we can only support top level Map<String, String> and the expansion service should unpack it correctly.
   }
   ```
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 206286)
    Time Spent: 3h 20m  (was: 3h 10m)

> Expose Java transforms (specifically IO) in other SDKs
> ------------------------------------------------------
>
>                 Key: BEAM-6730
>                 URL: https://issues.apache.org/jira/browse/BEAM-6730
>             Project: Beam
>          Issue Type: New Feature
>          Components: runner-flink, sdk-java-core, sdk-py-core
>            Reporter: Maximilian Michels
>            Assignee: Maximilian Michels
>            Priority: Major
>          Time Spent: 3h 20m
>  Remaining Estimate: 0h
>
> Since https://github.com/apache/beam/pull/7316 we can reference external transforms which are transforms only available in a "foreign" SDKs. This allows us to fill the gap in terms of missing transforms in the Python and Go SDK, specifically IO transforms.
> We can start collecting/exposing transforms that Beam users need. The following transforms could be interesting:
> - KafkaIO / KinesisIO
> - CassandraIO / ElasticserchIO / Hbase / Redis
> - JDBC
> - S3 file system
> - GenerateSequence
> See also https://s.apache.org/beam-cross-language-io and BEAM-6485.
> CC [~robertwb] [~chamikara] [~thw]



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