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https://issues.apache.org/jira/browse/HADOOP-18517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17629854#comment-17629854
 ] 

ASF GitHub Bot commented on HADOOP-18517:
-----------------------------------------

hadoop-yetus commented on PR #5103:
URL: https://github.com/apache/hadoop/pull/5103#issuecomment-1305716451

   :confetti_ball: **+1 overall**
   
   
   
   
   
   
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   |||| _ Patch Compile Tests _ |
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   | -0 :warning: |  checkstyle  |   0m 21s | 
[/results-checkstyle-hadoop-tools_hadoop-azure.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5103/2/artifact/out/results-checkstyle-hadoop-tools_hadoop-azure.txt)
 |  hadoop-tools/hadoop-azure: The patch generated 1 new + 2 unchanged - 0 
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   |||| _ Other Tests _ |
   | +1 :green_heart: |  unit  |   2m 27s |  |  hadoop-azure in the patch 
passed.  |
   | +1 :green_heart: |  asflicense  |   0m 46s |  |  The patch does not 
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   |  |   | 106m  9s |  |  |
   
   
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https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5103/2/artifact/out/Dockerfile
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   | GITHUB PR | https://github.com/apache/hadoop/pull/5103 |
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   | Max. process+thread count | 530 (vs. ulimit of 5500) |
   | modules | C: hadoop-tools/hadoop-azure U: hadoop-tools/hadoop-azure |
   | Console output | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5103/2/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.
   
   




> ABFS: Add fs.azure.enable.readahead option to disable readahead
> ---------------------------------------------------------------
>
>                 Key: HADOOP-18517
>                 URL: https://issues.apache.org/jira/browse/HADOOP-18517
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs/azure
>    Affects Versions: 3.3.4
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Major
>              Labels: pull-request-available
>
> Add an option fs.azure.enable.readahead to allow the abfs readahead to be 
> disabled.
> This has been shipping in cloudera releases, because workloads with heavy 
> random IO don't always benefit from prefetching.
> Pulling this in to ASF hadoop allows for
> * everyone to experiment with/without prefetching
> * ability to disable prefetching if you have problems with it



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