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From "Li Lu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-4987) Read cache concurrency issue between read and evict in EntityGroupFS timeline store
Date Thu, 19 May 2016 02:08:13 GMT

     [ https://issues.apache.org/jira/browse/YARN-4987?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Li Lu updated YARN-4987:
------------------------
    Attachment: YARN-4987-trunk.003.patch

003 patch addresses checkstyle issues. 

> Read cache concurrency issue between read and evict in EntityGroupFS timeline store 
> ------------------------------------------------------------------------------------
>
>                 Key: YARN-4987
>                 URL: https://issues.apache.org/jira/browse/YARN-4987
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Li Lu
>            Assignee: Li Lu
>            Priority: Critical
>         Attachments: YARN-4987-trunk.001.patch, YARN-4987-trunk.002.patch, YARN-4987-trunk.003.patch
>
>
> To handle concurrency issues, key value based timeline storage may return null on reads
that are concurrent to service stop. This is actually caused by a concurrency issue between
cache reads and evicts. Specifically, if the storage is being read when it gets evicted, the
storage may turn into null. EntityGroupFS timeline store needs to handle this case gracefully.




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