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From "Adam Holmberg (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7645) cqlsh: show partial trace if incomplete after max_trace_wait
Date Thu, 22 Oct 2015 16:28:27 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14969398#comment-14969398
] 

Adam Holmberg commented on CASSANDRA-7645:
------------------------------------------

bq. since the driver ignores the TraceUnavailable during ResultFuture construction.
That's why he originally changed it to attach the trace_id to the statement. That's also changing
in CASSANDRA-10513 and driver 3.0.

bq. maybe we should create a driver ticket to support partial query traces first?
Yes. I think QueryTrace should have the option to populate events without waiting for the
session. 
https://datastax-oss.atlassian.net/browse/PYTHON-438

I defer on whether to reopen this ticket or create a new one.

> cqlsh: show partial trace if incomplete after max_trace_wait
> ------------------------------------------------------------
>
>                 Key: CASSANDRA-7645
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7645
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Tools
>            Reporter: Tyler Hobbs
>            Assignee: Carl Yeksigian
>            Priority: Trivial
>             Fix For: 3.0.0 rc2, 2.2.4, 2.1.12
>
>
> If a trace hasn't completed within {{max_trace_wait}}, cqlsh will say the trace is unavailable
and not show anything.  It (and the underlying python driver) determines when the trace is
complete by checking if the {{duration}} column in {{system_traces.sessions}} is non-null.
 If {{duration}} is null but we still have some trace events when the timeout is hit, cqlsh
should print whatever trace events we have along with a warning about it being incomplete.



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