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Posted to issues@beam.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2022/03/09 16:03:00 UTC
[jira] [Work logged] (BEAM-14073) [CDAP] Batch plugin PoC
[ https://issues.apache.org/jira/browse/BEAM-14073?focusedWorklogId=738890&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-738890 ]
ASF GitHub Bot logged work on BEAM-14073:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 09/Mar/22 16:02
Start Date: 09/Mar/22 16:02
Worklog Time Spent: 10m
Work Description: Amar3tto opened a new pull request #17053:
URL: https://github.com/apache/beam/pull/17053
Cdap package contains an io-connector for [CDAP](https://cdap.atlassian.net/wiki/home) sources and sinks.
`CdapIO` is the primary class used in working with the connector in a pipeline. It contains static `PTransform` classes that represents reads/writes within the I/O (e.g. `Read`, `Write`).
`CdapIO.<~>read()` method method starts constructing a `CdapIO.Read` transform, it receives a type parameters`<~>` that specify the output type for CDAP source.
The `Read` class implements an interface similar to the builder pattern and has simple `withX()` methods for passing configuration and other settings needed before start reading from CDAP source:
- `withCdapPluginClass()` - pass a source/sink plugin class marked with CDAP `@Plugin` annotation. (e.g. `ZendeskBatchSource.class`)
- `withPluginConfig()`- pass a corresponding `PluginConfig` object (e.g. `ZendeskBatchSourceConfig.class`)
- `withKeyClass()` - specify the key class for the output (e.g. `NullWritable.class`)
- `withValueClass()`- specify the value class for the output (e.g. `StructuredRecord.class`)
Inside the `.withCdapPluginClass()` method, the `CdapPlugin` object is constructed. `CdapPlugin` object contains the following information about CDAP plugin:
- Bounded/Unbounded
- Input/Output
- `BatchContextImpl` object for stubbing some CDAP-specific behavior
- Format / Key / Value classes needed for filling Hadoop `Configuration` object
- `T cdapPluginObj` for performing `prepareRun()` call before reading
The following steps are performed in the `Read.expand()` method:
- Validating that all configs and other obligatory fields are set
- Call `CdapPlugin.prepareRun()` method before reading (see javadoc)
- Construct the needed `Read` transform depending on whether the `CdapPlugin` is bounded / unbounded:
- - For bounded sources `HadoopFormatIO.<K, V>read()` method is called passing filled Hadoop `Configuration` object.
- - For unbounded sources `SparkReceiverIO.<~>read()` method is called.
------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 738890)
Remaining Estimate: 0h
Time Spent: 10m
> [CDAP] Batch plugin PoC
> -----------------------
>
> Key: BEAM-14073
> URL: https://issues.apache.org/jira/browse/BEAM-14073
> Project: Beam
> Issue Type: Task
> Components: io-java-cdap
> Reporter: Elizaveta Lomteva
> Priority: P2
> Labels: cdap-io-sprint-1
> Time Spent: 10m
> Remaining Estimate: 0h
>
> h3. Context:
> As a result of the first sprint, we should represent the working PoC of one batch plugin
> h3. Task Description:
> Design and implement the first draft of the CDAP IO package architecture and its child components. Implement working read example with one batch CDAP plugin
> h3. Acceptance criteria:
> Design of the architecture of the CDAP IO package:
> # Diagram of the package directory structure
> # Sequence diagram for CDAP IO structural components
> Working read example with one batch CDAP plugin
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