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https://issues.apache.org/jira/browse/HDFS-16520?focusedWorklogId=755156&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-755156
 ]

ASF GitHub Bot logged work on HDFS-16520:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 11/Apr/22 09:54
            Start Date: 11/Apr/22 09:54
    Worklog Time Spent: 10m 
      Work Description: hadoop-yetus commented on PR #4104:
URL: https://github.com/apache/hadoop/pull/4104#issuecomment-1094839139

   :broken_heart: **-1 overall**
   
   
   
   
   
   
   | Vote | Subsystem | Runtime |  Logfile | Comment |
   |:----:|----------:|--------:|:--------:|:-------:|
   | +0 :ok: |  reexec  |   0m 42s |  |  Docker mode activated.  |
   |||| _ Prechecks _ |
   | +1 :green_heart: |  dupname  |   0m  0s |  |  No case conflicting files 
found.  |
   | +0 :ok: |  codespell  |   0m  1s |  |  codespell was not available.  |
   | +1 :green_heart: |  @author  |   0m  0s |  |  The patch does not contain 
any @author tags.  |
   | +1 :green_heart: |  test4tests  |   0m  0s |  |  The patch appears to 
include 1 new or modified test files.  |
   |||| _ trunk Compile Tests _ |
   | +0 :ok: |  mvndep  |  16m 13s |  |  Maven dependency ordering for branch  |
   | +1 :green_heart: |  mvninstall  |  25m 18s |  |  trunk passed  |
   | +1 :green_heart: |  compile  |   6m  1s |  |  trunk passed with JDK 
Ubuntu-11.0.14.1+1-Ubuntu-0ubuntu1.20.04  |
   | +1 :green_heart: |  compile  |   5m 45s |  |  trunk passed with JDK 
Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07  |
   | +1 :green_heart: |  checkstyle  |   1m 17s |  |  trunk passed  |
   | +1 :green_heart: |  mvnsite  |   2m 25s |  |  trunk passed  |
   | +1 :green_heart: |  javadoc  |   1m 52s |  |  trunk passed with JDK 
Ubuntu-11.0.14.1+1-Ubuntu-0ubuntu1.20.04  |
   | +1 :green_heart: |  javadoc  |   2m 20s |  |  trunk passed with JDK 
Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07  |
   | +1 :green_heart: |  spotbugs  |   5m 54s |  |  trunk passed  |
   | +1 :green_heart: |  shadedclient  |  23m  1s |  |  branch has no errors 
when building and testing our client artifacts.  |
   |||| _ Patch Compile Tests _ |
   | +0 :ok: |  mvndep  |   0m 28s |  |  Maven dependency ordering for patch  |
   | +1 :green_heart: |  mvninstall  |   2m  7s |  |  the patch passed  |
   | +1 :green_heart: |  compile  |   5m 54s |  |  the patch passed with JDK 
Ubuntu-11.0.14.1+1-Ubuntu-0ubuntu1.20.04  |
   | +1 :green_heart: |  javac  |   5m 54s |  |  the patch passed  |
   | +1 :green_heart: |  compile  |   5m 33s |  |  the patch passed with JDK 
Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07  |
   | +1 :green_heart: |  javac  |   5m 33s |  |  the patch passed  |
   | +1 :green_heart: |  blanks  |   0m  0s |  |  The patch has no blanks 
issues.  |
   | -0 :warning: |  checkstyle  |   1m  6s | 
[/results-checkstyle-hadoop-hdfs-project.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4104/4/artifact/out/results-checkstyle-hadoop-hdfs-project.txt)
 |  hadoop-hdfs-project: The patch generated 1 new + 29 unchanged - 0 fixed = 
30 total (was 29)  |
   | +1 :green_heart: |  mvnsite  |   2m 11s |  |  the patch passed  |
   | +1 :green_heart: |  javadoc  |   1m 29s |  |  the patch passed with JDK 
Ubuntu-11.0.14.1+1-Ubuntu-0ubuntu1.20.04  |
   | +1 :green_heart: |  javadoc  |   1m 57s |  |  the patch passed with JDK 
Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07  |
   | +1 :green_heart: |  spotbugs  |   5m 45s |  |  the patch passed  |
   | +1 :green_heart: |  shadedclient  |  22m 26s |  |  patch has no errors 
when building and testing our client artifacts.  |
   |||| _ Other Tests _ |
   | +1 :green_heart: |  unit  |   2m 22s |  |  hadoop-hdfs-client in the patch 
passed.  |
   | -1 :x: |  unit  | 229m 20s | 
[/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4104/4/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt)
 |  hadoop-hdfs in the patch passed.  |
   | +1 :green_heart: |  asflicense  |   0m 50s |  |  The patch does not 
generate ASF License warnings.  |
   |  |   | 370m 31s |  |  |
   
   
   | Reason | Tests |
   |-------:|:------|
   | Failed junit tests | 
hadoop.hdfs.TestDFSStripedInputStreamWithRandomECPolicy |
   
   
   | Subsystem | Report/Notes |
   |----------:|:-------------|
   | Docker | ClientAPI=1.41 ServerAPI=1.41 base: 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4104/4/artifact/out/Dockerfile
 |
   | GITHUB PR | https://github.com/apache/hadoop/pull/4104 |
   | Optional Tests | dupname asflicense compile javac javadoc mvninstall 
mvnsite unit shadedclient spotbugs checkstyle codespell |
   | uname | Linux 9f7e91d244d9 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 
11:12:41 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux |
   | Build tool | maven |
   | Personality | dev-support/bin/hadoop.sh |
   | git revision | trunk / d7c5bd02a8c6b3bec5a5a950e68cb09d0aa71ed5 |
   | Default Java | Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 |
   | Multi-JDK versions | 
/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.14.1+1-Ubuntu-0ubuntu1.20.04 
/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-4104/4/testReport/ |
   | Max. process+thread count | 3121 (vs. ulimit of 5500) |
   | modules | C: hadoop-hdfs-project/hadoop-hdfs-client 
hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project |
   | Console output | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4104/4/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: 755156)
    Time Spent: 1.5h  (was: 1h 20m)

> Improve EC pread: avoid potential reading whole block
> -----------------------------------------------------
>
>                 Key: HDFS-16520
>                 URL: https://issues.apache.org/jira/browse/HDFS-16520
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: dfsclient, ec
>    Affects Versions: 3.3.1, 3.3.2
>            Reporter: daimin
>            Assignee: daimin
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 1.5h
>  Remaining Estimate: 0h
>
> HDFS client 'pread' represents 'position read', this kind of read just need a 
> range of data instead of reading the whole file/block. By using 
> BlockReaderFactory#setLength, client tells datanode the block length to be 
> read from disk and sent to client.
> To EC file, the block length to read is not well set, by default using 
> 'block.getBlockSize() - offsetInBlock' to both pread and sread. Thus datanode 
> read much more data and send to client, and abort when client closes 
> connection. There is a lot waste of resource to this situation.



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