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Posted to issues@flink.apache.org by "Zhanghao Chen (Jira)" <ji...@apache.org> on 2022/11/21 03:13:00 UTC
[jira] [Commented] (FLINK-30101) Always use StandaloneClientHAServices to create RestClusterClient when retriving a Flink on YARN cluster client
[ https://issues.apache.org/jira/browse/FLINK-30101?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17636408#comment-17636408 ]
Zhanghao Chen commented on FLINK-30101:
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[~xtsong] Looking forwarding to your opinions on the proposal~ Much thanks
> Always use StandaloneClientHAServices to create RestClusterClient when retriving a Flink on YARN cluster client
> ----------------------------------------------------------------------------------------------------------------
>
> Key: FLINK-30101
> URL: https://issues.apache.org/jira/browse/FLINK-30101
> Project: Flink
> Issue Type: Improvement
> Components: Client / Job Submission
> Affects Versions: 1.16.0
> Reporter: Zhanghao Chen
> Priority: Major
> Fix For: 1.17.0
>
>
> *Problem*
> Currently, the procedure of retrieving a Flink on YARN cluster client is as follows (in YarnClusterDescriptor#retrieve method):
> # Get application report from YARN
> # Set rest.address & rest.port using the info from application report
> # Create a new RestClusterClient using the updated configuration, will use client HA serivce to fetch the rest.address & rest.port if HA is enabled
> Here, we can see that the usage of client HA in step 3 is redundant, as we've already got the rest.address & rest.port from YARN application report. When ZK HA is enabled, this would take ~1.5 s to initialize client HA services and fetch the rest IP & port.
> 1.5 s can mean a lot for latency-sensitive client operations. In my company, we use Flink client to submit short-running session jobs and e2e latency is critical. The job submission time is around 10 s on average, and 1.5s would mean 15% of time saving.
> *Proposal*
> When retrieving a Flink on YARN cluster client, use StandaloneClientHAServices to
> create RestClusterClient instead as we have pre-fetched rest.address & rest.port from YARN application report. This is also what we did in KubernetesClusterDescriptor.
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