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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (FLINK-4574) Strengthen fetch interval implementation in Kinesis consumer
Date Tue, 16 Oct 2018 02:19:00 GMT

     [ https://issues.apache.org/jira/browse/FLINK-4574?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

ASF GitHub Bot updated FLINK-4574:
----------------------------------
    Labels: pull-request-available  (was: )

> Strengthen fetch interval implementation in Kinesis consumer
> ------------------------------------------------------------
>
>                 Key: FLINK-4574
>                 URL: https://issues.apache.org/jira/browse/FLINK-4574
>             Project: Flink
>          Issue Type: Improvement
>          Components: Kinesis Connector
>    Affects Versions: 1.1.0
>            Reporter: Tzu-Li (Gordon) Tai
>            Assignee: Wei-Che Wei
>            Priority: Major
>              Labels: pull-request-available
>
> As pointed out by [~rmetzger], right now the fetch interval implementation in the {{ShardConsumer}}
class of the Kinesis consumer can lead to much longer interval times than specified by the
user, ex. say the specified fetch interval is {{f}}, it takes {{x}} to complete a {{getRecords()}}
call, and {{y}} to complete processing the fetched records for emitting, than the actual interval
between each fetch is actually {{f+x+y}}.
> The main problem with this is that we can never guarantee how much time has past since
the last {{getRecords}} call, thus can not guarantee that returned shard iterators will not
have expired the next time we use them, even if we limit the user-given value for {{f}} to
not be longer than the iterator expire time.
> I propose to improve this by, per {{ShardConsumer}}, use a {{ScheduledExecutorService}}
/ {{Timer}} to do the fixed-interval fetching, and a separate blocking queue that collects
the fetched records for emitting.



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