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https://issues.apache.org/jira/browse/HADOOP-19180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17874804#comment-17874804
 ] 

ASF GitHub Bot commented on HADOOP-19180:
-----------------------------------------

hadoop-yetus commented on PR #6972:
URL: https://github.com/apache/hadoop/pull/6972#issuecomment-2295892982

   :broken_heart: **-1 overall**
   
   
   
   
   
   
   | Vote | Subsystem | Runtime |  Logfile | Comment |
   |:----:|----------:|--------:|:--------:|:-------:|
   | +0 :ok: |  reexec  |   0m 18s |  |  Docker mode activated.  |
   |||| _ Prechecks _ |
   | +1 :green_heart: |  dupname  |   0m  0s |  |  No case conflicting files 
found.  |
   | +0 :ok: |  codespell  |   0m  0s |  |  codespell was not available.  |
   | +0 :ok: |  detsecrets  |   0m  0s |  |  detect-secrets was not available.  
|
   | +1 :green_heart: |  @author  |   0m  0s |  |  The patch does not contain 
any @author tags.  |
   | -1 :x: |  test4tests  |   0m  0s |  |  The patch doesn't appear to include 
any new or modified tests. Please justify why no new tests are needed for this 
patch. Also please list what manual steps were performed to verify this patch.  
|
   |||| _ trunk Compile Tests _ |
   | +1 :green_heart: |  mvninstall  |  32m 52s |  |  trunk passed  |
   | +1 :green_heart: |  compile  |   8m  6s |  |  trunk passed  |
   | +1 :green_heart: |  mvnsite  |   1m  4s |  |  trunk passed  |
   | +1 :green_heart: |  shadedclient  |  61m 48s |  |  branch has no errors 
when building and testing our client artifacts.  |
   |||| _ Patch Compile Tests _ |
   | +1 :green_heart: |  mvninstall  |   0m 32s |  |  the patch passed  |
   | +1 :green_heart: |  compile  |   7m 48s |  |  the patch passed  |
   | +1 :green_heart: |  cc  |   7m 48s |  |  the patch passed  |
   | +1 :green_heart: |  golang  |   7m 48s |  |  the patch passed  |
   | +1 :green_heart: |  javac  |   7m 48s |  |  the patch passed  |
   | +1 :green_heart: |  blanks  |   0m  0s |  |  The patch has no blanks 
issues.  |
   | +1 :green_heart: |  mvnsite  |   1m  0s |  |  the patch passed  |
   | +1 :green_heart: |  shadedclient  |  20m 27s |  |  patch has no errors 
when building and testing our client artifacts.  |
   |||| _ Other Tests _ |
   | -1 :x: |  unit  |  16m 40s | 
[/patch-unit-hadoop-common-project_hadoop-common.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6972/10/artifact/out/patch-unit-hadoop-common-project_hadoop-common.txt)
 |  hadoop-common in the patch passed.  |
   | +1 :green_heart: |  asflicense  |   0m 43s |  |  The patch does not 
generate ASF License warnings.  |
   |  |   | 109m 36s |  |  |
   
   
   | Reason | Tests |
   |-------:|:------|
   | Failed junit tests | hadoop.service.launcher.TestServiceInterruptHandling |
   
   
   | Subsystem | Report/Notes |
   |----------:|:-------------|
   | Docker | ClientAPI=1.46 ServerAPI=1.46 base: 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6972/10/artifact/out/Dockerfile
 |
   | GITHUB PR | https://github.com/apache/hadoop/pull/6972 |
   | Optional Tests | dupname asflicense compile cc mvnsite javac unit 
codespell detsecrets golang |
   | uname | Linux fee8f3e2c4ed 5.15.0-117-generic #127-Ubuntu SMP Fri Jul 5 
20:13:28 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux |
   | Build tool | maven |
   | Personality | dev-support/bin/hadoop.sh |
   | git revision | trunk / 63651c482f16bd234f49c89f2731b855979d8ca6 |
   | Default Java | Red Hat, Inc.-1.8.0_412-b08 |
   |  Test Results | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6972/10/testReport/ |
   | Max. process+thread count | 3151 (vs. ulimit of 5500) |
   | modules | C: hadoop-common-project/hadoop-common U: 
hadoop-common-project/hadoop-common |
   | Console output | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6972/10/console |
   | versions | git=2.9.5 maven=3.6.3 |
   | Powered by | Apache Yetus 0.14.0 https://yetus.apache.org |
   
   
   This message was automatically generated.
   
   




> EC: Fix calculation errors caused by special index order
> --------------------------------------------------------
>
>                 Key: HADOOP-19180
>                 URL: https://issues.apache.org/jira/browse/HADOOP-19180
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Chenyu Zheng
>            Assignee: Chenyu Zheng
>            Priority: Critical
>              Labels: pull-request-available
>
> I found that if the erasedIndexes distribution is such that the parity index 
> is in front of the data index, ec will produce wrong results when decoding.
> In fact, HDFS-15186 has described this problem, but does not fundamentally 
> solve it.
> The reason is that the code assumes that erasedIndexes is preceded by the 
> data index and followed by parity index. If there is a parity index placed in 
> front of the data index, a calculation error will occur.



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