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Posted to issues@beam.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/04/10 11:22:00 UTC
[jira] [Work logged] (BEAM-9439) KinesisReader does not report
correct backlog statistics
[ https://issues.apache.org/jira/browse/BEAM-9439?focusedWorklogId=420168&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-420168 ]
ASF GitHub Bot logged work on BEAM-9439:
----------------------------------------
Author: ASF GitHub Bot
Created on: 10/Apr/20 11:21
Start Date: 10/Apr/20 11:21
Worklog Time Spent: 10m
Work Description: sgraca commented on pull request #11377: [BEAM-9439] Return split instead of total backlog size
URL: https://github.com/apache/beam/pull/11377
This merge request changes how backlog bytes are reported by KinesisReader.
Instead of total backlog bytes, which could result in Dataflow pipelines not scaling up,
split backlog is now reported.
The split backlog size can be over-estimated as it reports the size
of the records across all shards (and also assumes that all shards
in the split have the same progress).
This can lead to unnecessary decisions to scale up the number of workers
but will never fail to scale up when this is necessary.
Also the watermark policy of the reader is user configurable and we
don't have a control over it. The calculation of backlog bytes should
always take into account the time that the record was inserted into
Kinesis as this gives accurate results which are independent of
current processing time or any other conditions that reader watermark
can be using. Therefore a separate, fixed policy is used to track
processed records for the backlog calculation.
------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 420168)
Remaining Estimate: 0h
Time Spent: 10m
> KinesisReader does not report correct backlog statistics
> ---------------------------------------------------------
>
> Key: BEAM-9439
> URL: https://issues.apache.org/jira/browse/BEAM-9439
> Project: Beam
> Issue Type: Bug
> Components: io-java-kinesis
> Reporter: Sam Whittle
> Assignee: Sebastian Graca
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> The KinesisReader implementing KinesisIO reports backlog by implementing the
> UnboundedSource.getTotalBacklogBytes()
> method as opposed to the
> UnboundedSource.getSplitBacklogBytes()
> This value is supposed to represent the total backlog across all shards. This function is implemented by calling SimplifiedKinesisClient.getBacklogBytes with the watermark of the kinesis shards managed within the UnboundedReader instance. As this watermark may be further ahead than the watermark across all shards, this may miss backlog bytes.
> An additional concern is that the watermark is calculated using a WatermarkPolicy, which means that the watermark may be inconsistent to the kinesis timestamp for querying backlog.
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