[jira] [Commented] (IMPALA-3292) Kudu scanner should not fail if KeepAlive request fails

["ASF subversion and git services (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IMPALA-3292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17703727#comment-17703727 ] 

ASF subversion and git services commented on IMPALA-3292:
---------------------------------------------------------

Commit 65ae5febee868addafb56b01f9276a03601dd039 in impala's branch refs/heads/master from Alexey Serbin
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=65ae5febe ]

IMPALA-12014 warning on failed KeepAlive for Kudu scanner

With this patch, there is now a warning message output when
ScannerKeepAlive RPC for a Kudu scanner fails.  To avoid flooding the
log with those messages, KLOG_EVERY_N_SECS(WARNING, 60) is used.

I also updated the signature of the KuduScanner::BuildErrorString()
method to become a constant one.

This is a follow-up to IMPALA-3292.

Change-Id: If39f968685797506491d3d5ebc481efb6e43a568
Reviewed-on: http://gerrit.cloudera.org:8080/19643
Reviewed-by: Wenzhe Zhou <wz...@cloudera.com>
Tested-by: Impala Public Jenkins <im...@cloudera.com>
Reviewed-by: Michael Smith <mi...@cloudera.com>


> Kudu scanner should not fail if KeepAlive request fails
> -------------------------------------------------------
>
>                 Key: IMPALA-3292
>                 URL: https://issues.apache.org/jira/browse/IMPALA-3292
>             Project: IMPALA
>          Issue Type: Bug
>          Components: Backend
>    Affects Versions: Kudu_Impala
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Minor
>             Fix For: Impala 2.7.0
>
>
> The KeepKuduScannerAlive() function can fail with ServiceUnavailable if it is running against a very heavily-loaded tablet server. This is OK -- it should ignore the warning and just try again after a short time, rather than failing the whole query.



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