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Posted to issues@beam.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2019/01/14 15:32:00 UTC
[jira] [Work logged] (BEAM-1240) Create RabbitMqIO
[ https://issues.apache.org/jira/browse/BEAM-1240?focusedWorklogId=184842&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-184842 ]
ASF GitHub Bot logged work on BEAM-1240:
----------------------------------------
Author: ASF GitHub Bot
Created on: 14/Jan/19 15:31
Start Date: 14/Jan/19 15:31
Worklog Time Spent: 10m
Work Description: alafanechere commented on issue #1729: [BEAM-1240] Create RabbitMqIO
URL: https://github.com/apache/beam/pull/1729#issuecomment-454046116
I tried to use the `RabbitMqIO` with the direct runner to generate an unbounded `PCollection` from a queue. I encounter a NPE :
````
java.lang.NullPointerException
at org.apache.beam.runners.direct.UnboundedReadEvaluatorFactory$UnboundedReadEvaluator.processElement (UnboundedReadEvaluatorFactory.java:169)
...
````
After investigation it looks like it's caused by the fact that no default is given to
`checkpointMark.oldestTimestamp`. `getWatermark()` is called before the mutation of the currentTimestamp variable, raising a NPE. I fixed the problem on my side, reimplementing the class and overriding `getWatermark` to return `Instant.now()` if `checkpointMark.oldestTimestamp` is null :
```
@Override
publicInstantgetWatermark() {
if (checkpointMark.oldestTimestamp == null) {
returnInstant.now();
}
return checkpointMark.oldestTimestamp;
}
```
It looks likes this bug as already been raised [on Jira](https://jira.apache.org/jira/browse/BEAM-1240?focusedCommentId=16566869&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16566869) and on [Stack Overflow](https://stackoverflow.com/questions/54042757/read-rabbitmq-from-beam-dataflow)
Do you think it's a problem that needs to be corrected ? Is there any workaround you might think of ?
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Issue Time Tracking
-------------------
Worklog Id: (was: 184842)
Time Spent: 14h (was: 13h 50m)
> Create RabbitMqIO
> -----------------
>
> Key: BEAM-1240
> URL: https://issues.apache.org/jira/browse/BEAM-1240
> Project: Beam
> Issue Type: New Feature
> Components: io-ideas
> Reporter: Jean-Baptiste Onofré
> Assignee: Jean-Baptiste Onofré
> Priority: Major
> Fix For: 2.9.0
>
> Time Spent: 14h
> Remaining Estimate: 0h
>
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