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Posted to issues@beam.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/09/23 18:29:00 UTC
[jira] [Work logged] (BEAM-10832) ClickhouseIO's getTableSchema
method is called before Pipeline Starts
[ https://issues.apache.org/jira/browse/BEAM-10832?focusedWorklogId=489741&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-489741 ]
ASF GitHub Bot logged work on BEAM-10832:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 23/Sep/20 18:28
Start Date: 23/Sep/20 18:28
Worklog Time Spent: 10m
Work Description: Vasu7052 opened a new pull request #12919:
URL: https://github.com/apache/beam/pull/12919
Have Moved **getTableSchema** method from expand to setup in ClickHouseIO so that **getTableSchema** method is executed only when pipeline starts not at the time of deployment.
------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 489741)
Remaining Estimate: 0h
Time Spent: 10m
> ClickhouseIO's getTableSchema method is called before Pipeline Starts
> ---------------------------------------------------------------------
>
> Key: BEAM-10832
> URL: https://issues.apache.org/jira/browse/BEAM-10832
> Project: Beam
> Issue Type: Improvement
> Components: beam-model
> Affects Versions: 2.23.0
> Reporter: Vasu Gupta
> Priority: P3
> Fix For: Not applicable
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> A method in ClickhouseIO called {color:#172b4d}getTableSchema() is being used in WriteFn's expand method which is called even before the Pipeline is started. The main issue is that getTableSchema() makes a connection with Clickhouse and if at the time of just pipeline launch, if i can't connect to a clickhouse-server, the pipeline won't even start. Let's suppose there is a clickhouse server deployed on a production server, now if i want to launch a DataFlow pipeline from my local then i shouldn't be requiring a working connection to clickhouse-server from my local environment (but i should be able to connect to clickhouse-server from dataflow).{color}
>
> {color:#172b4d}What i suggest:{color}
> {color:#172b4d}getTableSchema() should be a singleton method and must be called in setup() method (instead of PTransform's expand method) of DoFn since setup method is called after the pipeline is started (In my case "at DataFlow" not local){color}
>
> I would be more than happy to work on this improvement in Apache Beam (Java).
>
>
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