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https://issues.apache.org/jira/browse/DRILL-3022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14537618#comment-14537618
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Deneche A. Hakim commented on DRILL-3022:
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making DrillMetrics.resetMetrics() synchronized "may" actually solve this issue.
> Ensure sequential shutdown of Drillbits
> ---------------------------------------
>
> Key: DRILL-3022
> URL: https://issues.apache.org/jira/browse/DRILL-3022
> Project: Apache Drill
> Issue Type: Bug
> Components: Tools, Build & Test
> Affects Versions: 0.9.0
> Reporter: Hanifi Gunes
> Assignee: Hanifi Gunes
>
> When we run multiple bits within a JVM, shutting down bits might cause a race
> condition due to concurrent access to static MetricRegistry instance. This
> causes ugly error messages show up in the terminal. The proposal is to
> serialize shutdown of each bit via use of a global lock.
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