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https://issues.apache.org/jira/browse/HADOOP-18740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17728215#comment-17728215
 ] 

ASF GitHub Bot commented on HADOOP-18740:
-----------------------------------------

hadoop-yetus commented on PR #5675:
URL: https://github.com/apache/hadoop/pull/5675#issuecomment-1571346917

   :broken_heart: **-1 overall**
   
   
   
   
   
   
   | Vote | Subsystem | Runtime |  Logfile | Comment |
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|
   |||| _ trunk Compile Tests _ |
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Ubuntu-11.0.19+7-post-Ubuntu-0ubuntu120.04.1  |
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   |||| _ Patch Compile Tests _ |
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   |||| _ Other Tests _ |
   | +1 :green_heart: |  unit  |  18m 32s |  |  hadoop-common in the patch 
passed.  |
   | +1 :green_heart: |  asflicense  |   1m  2s |  |  The patch does not 
generate ASF License warnings.  |
   |  |   | 174m 48s |  |  |
   
   
   | Subsystem | Report/Notes |
   |----------:|:-------------|
   | Docker | ClientAPI=1.43 ServerAPI=1.43 base: 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5675/2/artifact/out/Dockerfile
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   | GITHUB PR | https://github.com/apache/hadoop/pull/5675 |
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https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5675/2/testReport/ |
   | Max. process+thread count | 1783 (vs. ulimit of 5500) |
   | modules | C: hadoop-common-project/hadoop-common U: 
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   | Console output | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5675/2/console |
   | versions | git=2.25.1 maven=3.6.3 spotbugs=4.2.2 |
   | Powered by | Apache Yetus 0.14.0 https://yetus.apache.org |
   
   
   This message was automatically generated.
   
   




> 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
>
> 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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