[jira] [Updated] (CASSANDRA-16938) Missed wait latencies in the output of `nodetool tpstats -F`

["Andres de la Peña (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-16938?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andres de la Peña updated CASSANDRA-16938:
------------------------------------------
     Bug Category: Parent values: Correctness(12982)Level 1 values: Transient Incorrect Response(12987)
       Complexity: Normal
    Discovered By: User Report
    Fix Version/s: 4.0.x
                   4.1
         Severity: Low
           Status: Open  (was: Triage Needed)

> Missed wait latencies in the output of `nodetool tpstats -F`
> ------------------------------------------------------------
>
>                 Key: CASSANDRA-16938
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-16938
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Tool/nodetool
>            Reporter: Andres de la Peña
>            Assignee: Andres de la Peña
>            Priority: Normal
>             Fix For: 4.1, 4.0.x
>
>
> The output of {{nodetool tpstats -F json}} always prints an empty map for {{WaitLatencies}}:
> {code}
> $ nodetool tpstats -F json
> ..."WaitLatencies":{},...
> {code}
> The same happens with yaml output:
> {code}
> $ nodetool tpstats -F yaml
> ...
> WaitLatencies: {}
> ...
> {code}
> This happens because [this cast|https://github.com/apache/cassandra/blob/cassandra-4.0.1/src/java/org/apache/cassandra/tools/nodetool/stats/TpStatsHolder.java#L61-L63] silently fails inside a try-catch with an empty catch block:
> {code}
> String[] strValues = (String[]) Arrays.stream(probe.metricPercentilesAsArray(probe.getMessagingQueueWaitMetrics(entry.getKey())))
>                                       .map(D -> D.toString())
>                                       .toArray();
> {code}
> When we would need something like:
> {code}
> String[] strValues = Arrays.stream(probe.metricPercentilesAsArray(probe.getMessagingQueueWaitMetrics(entry.getKey())))
>                            .map(Object::toString)
>                            .toArray(String[]::new);
> {code}
> This conversion from {{Double[]}} to {{String[]}} was introduced during CASSANDRA-16230. I think that conversion was done trying to work around a malformed JSON output detected in [the new tests|https://github.com/apache/cassandra/blob/cassandra-4.0.1/test/unit/org/apache/cassandra/tools/NodeToolTPStatsTest.java#L158] added by that ticket. Without the conversion the output would be something like:
> {code}
> $ nodetool tpstats -F json
> ..."WaitLatencies":{"READ_RSP":[Ljava.lang.Double;@398dada8,...
> {code}
> That's because {{json-simple}} doesn't handle well arrays. I think that instead of converting the array of doubles to an array of strings we can simply use {{jackson-mapper-asl}} to print the proper array.



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