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https://issues.apache.org/jira/browse/HDDS-3114?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Attila Doroszlai resolved HDDS-3114.
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    Resolution: Won't Do

Changed the map to a Guava cache with expiry.

> Implement background block-file closing thread
> ----------------------------------------------
>
>                 Key: HDDS-3114
>                 URL: https://issues.apache.org/jira/browse/HDDS-3114
>             Project: Hadoop Distributed Data Store
>          Issue Type: New Feature
>          Components: Ozone Datanode
>            Reporter: Attila Doroszlai
>            Assignee: Attila Doroszlai
>            Priority: Major
>
> With the new file-per-block layout introduced in HDDS-2717, block files are 
> kept open until closed on the last putBlock command.  To account for old 
> clients and other cases when this command is missing, block files not touched 
> for some time need to be closed in a background thread.



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