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https://issues.apache.org/jira/browse/IMPALA-6824?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16466614#comment-16466614
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bharath v commented on IMPALA-6824:
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[~lv] which commit broke this? If there is one, could you link it to this jira.
> Crash in RuntimeProfile::EventSequence::AddNewerEvents() when events_ is empty
> ------------------------------------------------------------------------------
>
> Key: IMPALA-6824
> URL: https://issues.apache.org/jira/browse/IMPALA-6824
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Affects Versions: Impala 3.0, Impala 2.12.0
> Reporter: Lars Volker
> Assignee: Lars Volker
> Priority: Blocker
> Fix For: Impala 3.0, Impala 2.12.0
>
>
> When {{events_}} is empty in runtime-profile-counters.h:347, events_.back()
> is undefined. This can lead to a crash. The fix is to check for
> {{events_.empty()}} before calling {{back()}}.
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