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https://issues.apache.org/jira/browse/HDFS-16896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17690075#comment-17690075
 ] 

ASF GitHub Bot commented on HDFS-16896:
---------------------------------------

hadoop-yetus commented on PR #5322:
URL: https://github.com/apache/hadoop/pull/5322#issuecomment-1433945193

   :broken_heart: **-1 overall**
   
   
   
   
   
   
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   | +1 :green_heart: |  test4tests  |   0m  0s |  |  The patch appears to 
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   | +0 :ok: |  mvndep  |   0m 28s |  |  Maven dependency ordering for patch  |
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[/results-checkstyle-hadoop-hdfs-project.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5322/6/artifact/out/results-checkstyle-hadoop-hdfs-project.txt)
 |  hadoop-hdfs-project: The patch generated 2 new + 42 unchanged - 0 fixed = 
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[/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5322/6/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt)
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   |  |   | 369m 46s |  |  |
   
   
   | Reason | Tests |
   |-------:|:------|
   | Failed junit tests | hadoop.hdfs.TestPread |
   |   | hadoop.hdfs.server.namenode.TestAuditLogs |
   |   | hadoop.hdfs.server.namenode.TestFsck |
   |   | hadoop.hdfs.server.namenode.TestAuditLogger |
   |   | hadoop.hdfs.server.namenode.TestFSNamesystemLockReport |
   
   
   | Subsystem | Report/Notes |
   |----------:|:-------------|
   | Docker | ClientAPI=1.42 ServerAPI=1.42 base: 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5322/6/artifact/out/Dockerfile
 |
   | GITHUB PR | https://github.com/apache/hadoop/pull/5322 |
   | Optional Tests | dupname asflicense compile javac javadoc mvninstall 
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   | uname | Linux d9582a898494 4.15.0-200-generic #211-Ubuntu SMP Thu Nov 24 
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   | Build tool | maven |
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/usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_352-8u352-ga-1~20.04-b08 |
   |  Test Results | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5322/6/testReport/ |
   | Max. process+thread count | 3251 (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-5322/6/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 |
   
   
   This message was automatically generated.
   
   




> HDFS Client hedged read has increased failure rate than without hedged read
> ---------------------------------------------------------------------------
>
>                 Key: HDFS-16896
>                 URL: https://issues.apache.org/jira/browse/HDFS-16896
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs-client
>            Reporter: Tom McCormick
>            Assignee: Tom McCormick
>            Priority: Major
>              Labels: pull-request-available
>
> When hedged read is enabled by HDFS client, we see an increased failure rate 
> on reads.
> *stacktrace*
>  
> {code:java}
> Caused by: org.apache.hadoop.hdfs.BlockMissingException: Could not obtain 
> block: BP-1183972111-10.197.192.88-1590025572374:blk_17114848218_16043459722 
> file=/data/tracking/streaming/AdImpressionEvent/daily/2022/07/18/compaction_1/part-r-1914862.1658217125623.1362294472.orc
> at 
> org.apache.hadoop.hdfs.DFSInputStream.refetchLocations(DFSInputStream.java:1077)
> at 
> org.apache.hadoop.hdfs.DFSInputStream.chooseDataNode(DFSInputStream.java:1060)
> at 
> org.apache.hadoop.hdfs.DFSInputStream.chooseDataNode(DFSInputStream.java:1039)
> at 
> org.apache.hadoop.hdfs.DFSInputStream.hedgedFetchBlockByteRange(DFSInputStream.java:1365)
> at org.apache.hadoop.hdfs.DFSInputStream.pread(DFSInputStream.java:1572)
> at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:1535)
> at org.apache.hadoop.fs.FSInputStream.readFully(FSInputStream.java:121)
> at 
> org.apache.hadoop.fs.FSDataInputStream.readFully(FSDataInputStream.java:112)
> at 
> org.apache.hadoop.fs.RetryingInputStream.lambda$readFully$3(RetryingInputStream.java:172)
> at org.apache.hadoop.fs.RetryPolicy.lambda$run$0(RetryPolicy.java:137)
> at org.apache.hadoop.fs.NoOpRetryPolicy.run(NoOpRetryPolicy.java:36)
> at org.apache.hadoop.fs.RetryPolicy.run(RetryPolicy.java:136)
> at 
> org.apache.hadoop.fs.RetryingInputStream.readFully(RetryingInputStream.java:168)
> at 
> org.apache.hadoop.fs.FSDataInputStream.readFully(FSDataInputStream.java:112)
> at 
> org.apache.hadoop.fs.FSDataInputStream.readFully(FSDataInputStream.java:112)
> at 
> io.trino.plugin.hive.orc.HdfsOrcDataSource.readInternal(HdfsOrcDataSource.java:76)
> ... 46 more
> {code}
>  



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