[jira] [Updated] (CASSANALYTICS-177) Add instanceId query parameter to fix HTTP 421 errors when Sidecar is behing an AWS Load Balancer

["Bianca Stanciu (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANALYTICS-177?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bianca Stanciu updated CASSANALYTICS-177:
-----------------------------------------
    Priority: High  (was: Normal)

> Add instanceId query parameter to fix HTTP 421 errors when Sidecar is behing an AWS Load Balancer
> -------------------------------------------------------------------------------------------------
>
>                 Key: CASSANALYTICS-177
>                 URL: https://issues.apache.org/jira/browse/CASSANALYTICS-177
>             Project: Apache Cassandra Analytics
>          Issue Type: Improvement
>          Components: Writer
>            Reporter: Bianca Stanciu
>            Assignee: Bianca Stanciu
>            Priority: High
>
> +_*Problem:*_+
> When Sidecar sits behind an AWS NLB, every HTTP request from the analytics client returns *421 Misdirected Request.*
> The NLB forwards TCP without modifying HTTP headers, so the Host header arriving at Sidecar contains the NLB's IP, not the Sidecar's own address. Sidecar uses Host to identify which Cassandra instance the request is for. 
> _*Solution:*_ 
> Add an optional instanceId query parameter appended to every outbound Sidecar request:
> {code:java}
> POST /api/v1/restore-job/slices?instanceId=1
> GET /api/v1/cassandra/timeSkew?instanceId=1{code}
> Sidecar already checks +_*?instanceId*_+ before the Host header, bypassing the NLB IP lookup entirely. No Sidecar-side changes needed. 
> Enabled with one Spark conf flag:
> {code:java}
> --conf "spark.cassandra_analytics.sidecar.instance.id=1" {code}
> Default is null, no parameter added, zero behavior change for the existing flow.
>  
>  



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