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https://issues.apache.org/jira/browse/HADOOP-18190?focusedWorklogId=793925&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-793925
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ASF GitHub Bot logged work on HADOOP-18190:
-------------------------------------------

                Author: ASF GitHub Bot
            Created on: 21/Jul/22 20:23
            Start Date: 21/Jul/22 20:23
    Worklog Time Spent: 10m 
      Work Description: hadoop-yetus commented on PR #4458:
URL: https://github.com/apache/hadoop/pull/4458#issuecomment-1191898786

   :broken_heart: **-1 overall**
   
   
   
   
   
   
   | Vote | Subsystem | Runtime |  Logfile | Comment |
   |:----:|----------:|--------:|:--------:|:-------:|
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   |||| _ feature-HADOOP-18028-s3a-prefetch Compile Tests _ |
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feature-HADOOP-18028-s3a-prefetch passed  |
   | +1 :green_heart: |  compile  |  28m  0s |  |  
feature-HADOOP-18028-s3a-prefetch passed with JDK Private 
Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1  |
   | +1 :green_heart: |  compile  |  23m 31s |  |  
feature-HADOOP-18028-s3a-prefetch passed with JDK Private 
Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07  |
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feature-HADOOP-18028-s3a-prefetch passed  |
   | +1 :green_heart: |  mvnsite  |   3m 34s |  |  
feature-HADOOP-18028-s3a-prefetch passed  |
   | +1 :green_heart: |  javadoc  |   2m 37s |  |  
feature-HADOOP-18028-s3a-prefetch passed with JDK Private 
Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1  |
   | +1 :green_heart: |  javadoc  |   2m 10s |  |  
feature-HADOOP-18028-s3a-prefetch passed with JDK Private 
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feature-HADOOP-18028-s3a-prefetch passed  |
   | +1 :green_heart: |  shadedclient  |  26m  4s |  |  branch has no errors 
when building and testing our client artifacts.  |
   | -0 :warning: |  patch  |  26m 34s |  |  Used diff version of patch file. 
Binary files and potentially other changes not applied. Please rebase and 
squash commits if necessary.  |
   |||| _ Patch Compile Tests _ |
   | +0 :ok: |  mvndep  |   0m 30s |  |  Maven dependency ordering for patch  |
   | +1 :green_heart: |  mvninstall  |   2m  2s |  |  the patch passed  |
   | +1 :green_heart: |  compile  |  26m 54s |  |  the patch passed with JDK 
Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1  |
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issues.  |
   | -0 :warning: |  checkstyle  |   4m 31s | 
[/results-checkstyle-root.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4458/9/artifact/out/results-checkstyle-root.txt)
 |  root: The patch generated 8 new + 1 unchanged - 0 fixed = 9 total (was 1)  |
   | +1 :green_heart: |  mvnsite  |   3m 27s |  |  the patch passed  |
   | +1 :green_heart: |  javadoc  |   2m 21s |  |  the patch passed with JDK 
Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1  |
   | +1 :green_heart: |  javadoc  |   2m  7s |  |  the patch passed with JDK 
Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07  |
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[/new-spotbugs-hadoop-tools_hadoop-aws.html](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4458/9/artifact/out/new-spotbugs-hadoop-tools_hadoop-aws.html)
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   |||| _ Other Tests _ |
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passed.  |
   | +1 :green_heart: |  unit  |   3m 12s |  |  hadoop-aws in the patch passed. 
 |
   | +1 :green_heart: |  asflicense  |   1m 18s |  |  The patch does not 
generate ASF License warnings.  |
   |  |   | 266m 57s |  |  |
   
   
   | Reason | Tests |
   |-------:|:------|
   | SpotBugs | module:hadoop-tools/hadoop-aws |
   |  |  Possible null pointer dereference of tracker in 
org.apache.hadoop.fs.common.CachingBlockManager.readBlock(BufferData, boolean, 
BufferData$State[])  Dereferenced at CachingBlockManager.java:tracker in 
org.apache.hadoop.fs.common.CachingBlockManager.readBlock(BufferData, boolean, 
BufferData$State[])  Dereferenced at CachingBlockManager.java:[line 365] |
   
   
   | Subsystem | Report/Notes |
   |----------:|:-------------|
   | Docker | ClientAPI=1.41 ServerAPI=1.41 base: 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4458/9/artifact/out/Dockerfile
 |
   | GITHUB PR | https://github.com/apache/hadoop/pull/4458 |
   | Optional Tests | dupname asflicense compile javac javadoc mvninstall 
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   | uname | Linux 716ab780773f 4.15.0-175-generic #184-Ubuntu SMP Thu Mar 24 
17:48:36 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux |
   | Build tool | maven |
   | Personality | dev-support/bin/hadoop.sh |
   | git revision | feature-HADOOP-18028-s3a-prefetch / 
62d1b8d9728f9b04abadb12756941ff9f36ac940 |
   | Default Java | Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 |
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/usr/lib/jvm/java-8-openjdk-amd64:Private 
Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 |
   |  Test Results | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4458/9/testReport/ |
   | Max. process+thread count | 1252 (vs. ulimit of 5500) |
   | modules | C: hadoop-common-project/hadoop-common hadoop-tools/hadoop-aws 
U: . |
   | Console output | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4458/9/console |
   | versions | git=2.25.1 maven=3.6.3 spotbugs=4.2.2 |
   | Powered by | Apache Yetus 0.14.0-SNAPSHOT https://yetus.apache.org |
   
   
   This message was automatically generated.
   
   




Issue Time Tracking
-------------------

    Worklog Id:     (was: 793925)
    Time Spent: 2h 50m  (was: 2h 40m)

> s3a prefetching streams to collect iostats on prefetching operations
> --------------------------------------------------------------------
>
>                 Key: HADOOP-18190
>                 URL: https://issues.apache.org/jira/browse/HADOOP-18190
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 3.4.0
>            Reporter: Steve Loughran
>            Assignee: Ahmar Suhail
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 2h 50m
>  Remaining Estimate: 0h
>
> There is a lot more happening in reads, so there's a lot more data to collect 
> and publish in IO stats for us to view in a summary at the end of processes 
> as well as get from the stream while it is active.
> Some useful ones would seem to be:
> counters
>  * is in memory. using 0 or 1 here lets aggregation reports count total #of 
> memory cached files.
>  * prefetching operations executed
>  * errors during prefetching
> gauges
>  * number of blocks in cache
>  * total size of blocks
>  * active prefetches
> + active memory used
> duration tracking count/min/max/ave
>  * time to fetch a block
>  * time queued before the actual fetch begins
>  * time a reader is blocked waiting for a block fetch to complete
> and some info on cache use itself
>  * number of blocks discarded unread
>  * number of prefetched blocks later used
>  * number of backward seeks to a prefetched block
>  * number of forward seeks to a prefetched block
> the key ones I care about are
>  # memory consumption
>  # can we determine if cache is working (reads with cache hit) and when it is 
> not (misses, wasted prefetches)
>  # time blocked on executors
> The stats need to be accessible on a stream even when closed, and aggregated 
> into the FS. once we get per-thread stats contexts we can publish there too 
> and collect in worker threads for reporting in task commits



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