Li Lu updated YARN-4219:
    Attachment: YARN-4219-YARN-4265.003.patch

Fixed the synchronization issue on service stop. 

> New levelDB cache storage for timeline v1.5
> -------------------------------------------
>                 Key: YARN-4219
>                 URL: https://issues.apache.org/jira/browse/YARN-4219
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>    Affects Versions: 2.8.0
>            Reporter: Li Lu
>            Assignee: Li Lu
>         Attachments: YARN-4219-YARN-4265.001.patch, 
> YARN-4219-YARN-4265.002.patch, YARN-4219-YARN-4265.003.patch, 
> YARN-4219-trunk.001.patch, YARN-4219-trunk.002.patch, 
> YARN-4219-trunk.003.patch
> We need to have an "offline" caching storage for timeline server v1.5 after 
> the changes in YARN-3942. The in memory timeline storage may run into OOM 
> issues when used as a cache storage for entity file timeline storage. We can 
> refactor the code and have a level db based caching storage for this use 
> case. 

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