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From "Jason Dere (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-19127) Concurrency fixes in QueryResultsCache
Date Fri, 06 Apr 2018 18:02:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-19127?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jason Dere updated HIVE-19127:
------------------------------
    Status: Patch Available  (was: Open)

> Concurrency fixes in QueryResultsCache
> --------------------------------------
>
>                 Key: HIVE-19127
>                 URL: https://issues.apache.org/jira/browse/HIVE-19127
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Jason Dere
>            Assignee: Jason Dere
>            Priority: Major
>         Attachments: HIVE-19127.1.patch
>
>
> A few fixes around concurrent access in the results cache
> - Take a lock on the cache entry when in the process of setting the cache entry from
PENDING state to VALID state, so that other threads cannot invalidate the entry
> - The write lock on the cache was not being taken when removing an entry from the cache.
> - synchronize access when iterating through the lru keyset



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