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https://issues.apache.org/jira/browse/HDFS-17332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17806283#comment-17806283
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ASF GitHub Bot commented on HDFS-17332:
---------------------------------------

hadoop-yetus commented on PR #6446:
URL: https://github.com/apache/hadoop/pull/6446#issuecomment-1890444134

   :broken_heart: **-1 overall**
   
   
   
   
   
   
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   |||| _ Prechecks _ |
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   | +0 :ok: |  detsecrets  |   0m  1s |  |  detect-secrets 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 2 new or modified test files.  |
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Ubuntu-11.0.21+9-post-Ubuntu-0ubuntu120.04  |
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Ubuntu-11.0.21+9-post-Ubuntu-0ubuntu120.04  |
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Private Build-1.8.0_392-8u392-ga-1~20.04-b08  |
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   | +1 :green_heart: |  shadedclient  |  39m 56s |  |  branch has no errors 
when building and testing our client artifacts.  |
   |||| _ Patch Compile Tests _ |
   | +0 :ok: |  mvndep  |   0m 29s |  |  Maven dependency ordering for patch  |
   | +1 :green_heart: |  mvninstall  |   2m  1s |  |  the patch passed  |
   | +1 :green_heart: |  compile  |   5m 57s |  |  the patch passed with JDK 
Ubuntu-11.0.21+9-post-Ubuntu-0ubuntu120.04  |
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   | +1 :green_heart: |  compile  |   5m 41s |  |  the patch passed with JDK 
Private Build-1.8.0_392-8u392-ga-1~20.04-b08  |
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issues.  |
   | -0 :warning: |  checkstyle  |   1m 17s | 
[/results-checkstyle-hadoop-hdfs-project.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6446/5/artifact/out/results-checkstyle-hadoop-hdfs-project.txt)
 |  hadoop-hdfs-project: The patch generated 12 new + 43 unchanged - 1 fixed = 
55 total (was 44)  |
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   |||| _ Other Tests _ |
   | +1 :green_heart: |  unit  |   2m 24s |  |  hadoop-hdfs-client in the patch 
passed.  |
   | -1 :x: |  unit  | 256m 13s | 
[/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6446/5/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt)
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   |  |   | 443m 32s |  |  |
   
   
   | Reason | Tests |
   |-------:|:------|
   | Failed junit tests | hadoop.hdfs.server.datanode.TestDirectoryScanner |
   
   
   | Subsystem | Report/Notes |
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https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6446/5/artifact/out/Dockerfile
 |
   | GITHUB PR | https://github.com/apache/hadoop/pull/6446 |
   | Optional Tests | dupname asflicense compile javac javadoc mvninstall 
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   |  Test Results | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6446/5/testReport/ |
   | Max. process+thread count | 2197 (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-6446/5/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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> DFSInputStream: avoid logging stacktrace until when we really need to fail a 
> read request with a MissingBlockException
> ----------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-17332
>                 URL: https://issues.apache.org/jira/browse/HDFS-17332
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs
>            Reporter: Xing Lin
>            Assignee: Xing Lin
>            Priority: Minor
>              Labels: pull-request-available
>
> In DFSInputStream#actualGetFromOneDataNode(), it would send the exception 
> stacktrace to the dfsClient.LOG whenever we fail on a DN. However, in most 
> cases, the read request will be served successfully by reading from the next 
> available DN. The existence of exception stacktrace in the log has caused 
> multiple hadoop users at Linkedin to consider this WARN message as the 
> RC/fatal error for their jobs.  We would like to improve the log message and 
> avoid sending the stacktrace to dfsClient.LOG when a read succeeds. The 
> stackTrace when reading reach DN is sent to the log only when we really need 
> to fail a read request (when chooseDataNode()/refetchLocations() throws a 
> BlockMissingException). 
>  
> Example stack trace
> {code:java}
> [12]<stderr>:23/11/30 23:01:33 WARN hdfs.DFSClient: Connection failure: 
> Failed to connect to 10.150.91.13/10.150.91.13:71 for file 
> /XXXX/part-yyyy-95b9909c-zzz-c000.avro for block 
> BP-364971551-DatanodeIP-1448516588954:blk_zzzz_129864739321:java.net.SocketTimeoutException:
>  60000 millis timeout while waiting for channel to be ready for read. ch : 
> java.nio.channels.SocketChannel[connected local=/ip:40492 
> remote=datanodeIP:71] [12]<stderr>:java.net.SocketTimeoutException: 60000 
> millis timeout while waiting for channel to be ready for read. ch : 
> java.nio.channels.SocketChannel[connected local=/localIp:40492 
> remote=datanodeIP:71] [12]<stderr>: at 
> org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:164) 
> [12]<stderr>: at 
> org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:161) 
> [12]<stderr>: at 
> org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:131) 
> [12]<stderr>: at 
> org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:118) 
> [12]<stderr>: at java.io.FilterInputStream.read(FilterInputStream.java:83) 
> [12]<stderr>: at 
> org.apache.hadoop.hdfs.protocolPB.PBHelperClient.vintPrefixed(PBHelperClient.java:458)
>  [12]<stderr>: at 
> org.apache.hadoop.hdfs.client.impl.BlockReaderRemote2.newBlockReader(BlockReaderRemote2.java:412)
>  [12]<stderr>: at 
> org.apache.hadoop.hdfs.client.impl.BlockReaderFactory.getRemoteBlockReader(BlockReaderFactory.java:864)
>  [12]<stderr>: at 
> org.apache.hadoop.hdfs.client.impl.BlockReaderFactory.getRemoteBlockReaderFromTcp(BlockReaderFactory.java:753)
>  [12]<stderr>: at 
> org.apache.hadoop.hdfs.client.impl.BlockReaderFactory.build(BlockReaderFactory.java:387)
>  [12]<stderr>: at 
> org.apache.hadoop.hdfs.DFSInputStream.getBlockReader(DFSInputStream.java:736) 
> [12]<stderr>: at 
> org.apache.hadoop.hdfs.DFSInputStream.actualGetFromOneDataNode(DFSInputStream.java:1268)
>  [12]<stderr>: at 
> org.apache.hadoop.hdfs.DFSInputStream.fetchBlockByteRange(DFSInputStream.java:1216)
>  [12]<stderr>: at 
> org.apache.hadoop.hdfs.DFSInputStream.pread(DFSInputStream.java:1608) 
> [12]<stderr>: at 
> org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:1568) 
> [12]<stderr>: at 
> org.apache.hadoop.fs.FSDataInputStream.read(FSDataInputStream.java:93) 
> [12]<stderr>: at 
> hdfs_metrics_shade.org.apache.hadoop.fs.InstrumentedFSDataInputStream$InstrumentedFilterInputStream.lambda$read$0(InstrumentedFSDataInputStream.java:108)
>  [12]<stderr>: at 
> com.linkedin.hadoop.metrics.fs.PerformanceTrackingFSDataInputStream.process(PerformanceTrackingFSDataInputStream.java:39)
>  [12]<stderr>: at 
> hdfs_metrics_shade.org.apache.hadoop.fs.InstrumentedFSDataInputStream$InstrumentedFilterInputStream.read(InstrumentedFSDataInputStream.java:108)
>  [12]<stderr>: at 
> org.apache.hadoop.fs.FSDataInputStream.read(FSDataInputStream.java:93) 
> [12]<stderr>: at 
> org.apache.hadoop.fs.RetryingInputStream.lambda$read$2(RetryingInputStream.java:153)
>  [12]<stderr>: at 
> org.apache.hadoop.fs.NoOpRetryPolicy.run(NoOpRetryPolicy.java:36) 
> [12]<stderr>: at 
> org.apache.hadoop.fs.RetryingInputStream.read(RetryingInputStream.java:149) 
> [12]<stderr>: at 
> org.apache.hadoop.fs.FSDataInputStream.read(FSDataInputStream.java:93){code}



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