[jira] [Commented] (FLINK-7223) Increase DEFAULT_SHARD_DISCOVERY_INTERVAL_MILLIS for Flink-kinesis-connector

["Stephan Ewen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-7223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16093334#comment-16093334 ] 

Stephan Ewen commented on FLINK-7223:
-------------------------------------

[~tzulitai] what do you think about that?

What is affected by that? The responsiveness to appearance of new shards (elasticity of Kinesis), or the responsiveness to new streams?
If the former was affected, then 5 minutes can be a lot. For the later I would think it is not too bad.

> Increase DEFAULT_SHARD_DISCOVERY_INTERVAL_MILLIS for Flink-kinesis-connector
> ----------------------------------------------------------------------------
>
>                 Key: FLINK-7223
>                 URL: https://issues.apache.org/jira/browse/FLINK-7223
>             Project: Flink
>          Issue Type: Improvement
>          Components: Kinesis Connector
>    Affects Versions: 1.3.0
>            Reporter: Bowen Li
>            Assignee: Bowen Li
>            Priority: Minor
>             Fix For: 1.4.0
>
>
> Background: {{DEFAULT_SHARD_DISCOVERY_INTERVAL_MILLIS}} in {{org.apache.flink.streaming.connectors.kinesis.config.ConsumerConfigConstants}} is the default value for Flink to call Kinesis's {{describeStream()}} API.
> Problem: Right now, its value is 10,000millis (10sec), which is too short. We ran into problems that Flink-kinesis-connector's call of {{describeStream()}} exceeds Kinesis rate limit, and broken Flink taskmanager.
> According to http://docs.aws.amazon.com/kinesis/latest/APIReference/API_DescribeStream.html, 
> "This operation has a limit of 10 transactions per second per account.". What it means is that the 10transaction/account is a limit on a single organization's AWS account......:(  We contacted AWS Support, and confirmed this. If you have more applications (either other Flink apps or non-Flink apps) competing aggressively with your Flink app on this API, your Flink app breaks. 
> I propose increasing the value DEFAULT_SHARD_DISCOVERY_INTERVAL_MILLIS from 10,000millis(10sec) to preferably 300,000 (5min). Or at least 60,000 (1min) if anyone has a solid reason arguing that 5min is too long, 
> This is also related to https://issues.apache.org/jira/browse/FLINK-6365



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