[jira] [Updated] (HADOOP-18740) s3a prefetch cache blocks should be accessed by RW locks

["Wei-Chiu Chuang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-18740?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wei-Chiu Chuang updated HADOOP-18740:
-------------------------------------
    Fix Version/s: 3.4.0
                   3.3.6

> s3a prefetch cache blocks should be accessed by RW locks
> --------------------------------------------------------
>
>                 Key: HADOOP-18740
>                 URL: https://issues.apache.org/jira/browse/HADOOP-18740
>             Project: Hadoop Common
>          Issue Type: Sub-task
>            Reporter: Viraj Jasani
>            Assignee: Viraj Jasani
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.4.0, 3.3.6
>
>
> In order to implement LRU or LFU based cache removal policies for s3a prefetched cache blocks, it is important for all cache reader threads to acquire read lock and similarly cache file removal mechanism (fs close or cache eviction) to acquire write lock before accessing the files.
> As we maintain the block entries in an in-memory map, we should be able to introduce read-write lock per cache file entry, we don't need coarse-grained lock shared by all entries.
>  
> This is a prerequisite to HADOOP-18291.



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