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https://issues.apache.org/jira/browse/HADOOP-19134?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17874635#comment-17874635
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ASF GitHub Bot commented on HADOOP-19134:
-----------------------------------------

hadoop-yetus commented on PR #6692:
URL: https://github.com/apache/hadoop/pull/6692#issuecomment-2295227566

   :broken_heart: **-1 overall**
   
   
   
   
   
   
   | Vote | Subsystem | Runtime |  Logfile | Comment |
   |:----:|----------:|--------:|:--------:|:-------:|
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   | +1 :green_heart: |  mvninstall  |   7m 32s |  |  the patch passed  |
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Private Build-1.8.0_422-8u422-b05-1~20.04-b05  |
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issues.  |
   | -0 :warning: |  checkstyle  |   2m 24s | 
[/results-checkstyle-root.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6692/9/artifact/out/results-checkstyle-root.txt)
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   | +1 :green_heart: |  shadedclient  |  20m 45s |  |  patch has no errors 
when building and testing our client artifacts.  |
   |||| _ Other Tests _ |
   | +1 :green_heart: |  unit  |  16m 56s |  |  hadoop-common in the patch 
passed.  |
   | +1 :green_heart: |  unit  |   3m 15s |  |  hadoop-kms in the patch passed. 
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   | -1 :x: |  unit  | 192m 31s | 
[/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6692/9/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt)
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   |  |   | 773m 57s |  |  |
   
   
   | Reason | Tests |
   |-------:|:------|
   | Failed junit tests | hadoop.hdfs.util.TestCombinedHostsFileReader |
   
   
   | Subsystem | Report/Notes |
   |----------:|:-------------|
   | Docker | ClientAPI=1.46 ServerAPI=1.46 base: 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6692/9/artifact/out/Dockerfile
 |
   | GITHUB PR | https://github.com/apache/hadoop/pull/6692 |
   | Optional Tests | dupname asflicense compile javac javadoc mvninstall 
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   | uname | Linux b304ccf54928 5.15.0-116-generic #126-Ubuntu SMP Mon Jul 1 
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   | Build tool | maven |
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   | git revision | trunk / fe3efc6452df8a911232c6dfcf18519fe8ab484a |
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|
   |  Test Results | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6692/9/testReport/ |
   | Max. process+thread count | 4708 (vs. ulimit of 5500) |
   | modules | C: hadoop-common-project/hadoop-common 
hadoop-common-project/hadoop-kms hadoop-hdfs-project/hadoop-hdfs 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager
 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager
 hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-common 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient
 hadoop-tools/hadoop-distcp 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router 
hadoop-mapreduce-project/hadoop-mapreduce-examples 
hadoop-tools/hadoop-streaming hadoop-tools/hadoop-rumen 
hadoop-tools/hadoop-datajoin hadoop-tools/hadoop-aws U: . |
   | Console output | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6692/9/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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> use StringBuilder instead of StringBuffer
> -----------------------------------------
>
>                 Key: HADOOP-19134
>                 URL: https://issues.apache.org/jira/browse/HADOOP-19134
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: PJ Fanning
>            Assignee: PJ Fanning
>            Priority: Major
>              Labels: pull-request-available
>
> StringBuilder is basically the same as StringBuffer but doesn't use 
> synchronized. String appending rarely needs locking like this.
> There are some public and package private APIs that use StringBuffers as 
> input or return types - I have left these alone for compatibility reasons.



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