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https://issues.apache.org/jira/browse/HADOOP-19167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17844616#comment-17844616
 ] 

ASF GitHub Bot commented on HADOOP-19167:
-----------------------------------------

hadoop-yetus commented on PR #6798:
URL: https://github.com/apache/hadoop/pull/6798#issuecomment-2100264516

   :broken_heart: **-1 overall**
   
   
   
   
   
   
   | Vote | Subsystem | Runtime |  Logfile | Comment |
   |:----:|----------:|--------:|:--------:|:-------:|
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   |||| _ Prechecks _ |
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   | +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 _ |
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   | +1 :green_heart: |  compile  |   9m 30s |  |  trunk passed with JDK 
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Private Build-1.8.0_402-8u402-ga-2ubuntu1~20.04-b06  |
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   | +1 :green_heart: |  mvnsite  |   0m 56s |  |  trunk passed  |
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Ubuntu-11.0.22+7-post-Ubuntu-0ubuntu220.04.1  |
   | +1 :green_heart: |  javadoc  |   0m 30s |  |  trunk passed with JDK 
Private Build-1.8.0_402-8u402-ga-2ubuntu1~20.04-b06  |
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   | +1 :green_heart: |  shadedclient  |  23m 44s |  |  branch has no errors 
when building and testing our client artifacts.  |
   |||| _ Patch Compile Tests _ |
   | +1 :green_heart: |  mvninstall  |   0m 35s |  |  the patch passed  |
   | +1 :green_heart: |  compile  |  11m 11s |  |  the patch passed with JDK 
Ubuntu-11.0.22+7-post-Ubuntu-0ubuntu220.04.1  |
   | +1 :green_heart: |  javac  |  11m 11s |  |  the patch passed  |
   | +1 :green_heart: |  compile  |  10m 42s |  |  the patch passed with JDK 
Private Build-1.8.0_402-8u402-ga-2ubuntu1~20.04-b06  |
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issues.  |
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   | +1 :green_heart: |  mvnsite  |   1m  9s |  |  the patch passed  |
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Ubuntu-11.0.22+7-post-Ubuntu-0ubuntu220.04.1  |
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   |||| _ Other Tests _ |
   | -1 :x: |  unit  |  18m 30s | 
[/patch-unit-hadoop-common-project_hadoop-common.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6798/3/artifact/out/patch-unit-hadoop-common-project_hadoop-common.txt)
 |  hadoop-common in the patch passed.  |
   | +1 :green_heart: |  asflicense  |   0m 42s |  |  The patch does not 
generate ASF License warnings.  |
   |  |   | 159m 52s |  |  |
   
   
   | Reason | Tests |
   |-------:|:------|
   | Failed junit tests | hadoop.metrics2.source.TestJvmMetrics |
   |   | hadoop.net.TestSocketIOWithTimeout |
   
   
   | Subsystem | Report/Notes |
   |----------:|:-------------|
   | Docker | ClientAPI=1.44 ServerAPI=1.44 base: 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6798/3/artifact/out/Dockerfile
 |
   | GITHUB PR | https://github.com/apache/hadoop/pull/6798 |
   | Optional Tests | dupname asflicense compile javac javadoc mvninstall 
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   | uname | Linux ee36b7172d7f 5.15.0-94-generic #104-Ubuntu SMP Tue Jan 9 
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   | Build tool | maven |
   | Personality | dev-support/bin/hadoop.sh |
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/usr/lib/jvm/java-8-openjdk-amd64:Private 
Build-1.8.0_402-8u402-ga-2ubuntu1~20.04-b06 |
   |  Test Results | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6798/3/testReport/ |
   | Max. process+thread count | 1269 (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-6798/3/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 |
   
   
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> Change of Codec configuration does not work
> -------------------------------------------
>
>                 Key: HADOOP-19167
>                 URL: https://issues.apache.org/jira/browse/HADOOP-19167
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: compress
>            Reporter: Zhikai Hu
>            Priority: Minor
>              Labels: pull-request-available
>
> In one of my projects, I need to dynamically adjust compression level for 
> different files. 
> However, I found that in most cases the new compression level does not take 
> effect as expected, the old compression level continues to be used.
> Here is the relevant code snippet:
> ZStandardCodec zStandardCodec = new ZStandardCodec();
> zStandardCodec.setConf(conf);
> conf.set("io.compression.codec.zstd.level", "5"); // level may change 
> dynamically
> conf.set("io.compression.codec.zstd", zStandardCodec.getClass().getName());
> writer = SequenceFile.createWriter(conf, 
> SequenceFile.Writer.file(sequenceFilePath),
>                                 
> SequenceFile.Writer.keyClass(LongWritable.class),
>                                 
> SequenceFile.Writer.valueClass(BytesWritable.class),
>                                 
> SequenceFile.Writer.compression(CompressionType.BLOCK));
> The reason is SequenceFile.Writer.init() method will call 
> CodecPool.getCompressor(codec, null) to get a compressor. 
> If the compressor is a reused instance, the conf is not applied because it is 
> passed as null:
> public static Compressor getCompressor(CompressionCodec codec, Configuration 
> conf) {
> Compressor compressor = borrow(compressorPool, codec.getCompressorType());
> if (compressor == null)
> { compressor = codec.createCompressor(); LOG.info("Got brand-new compressor 
> ["+codec.getDefaultExtension()+"]"); }
> else {
> compressor.reinit(conf);   //conf is null here
> ......
>  
> Please also refer to my unit test to reproduce the bug. 
> To address this bug, I modified the code to ensure that the configuration is 
> read back from the codec when a compressor is reused.



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