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https://issues.apache.org/jira/browse/HDFS-16732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17584955#comment-17584955
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ASF GitHub Bot commented on HDFS-16732:
---------------------------------------

xkrogen merged PR #4756:
URL: https://github.com/apache/hadoop/pull/4756




> [SBN READ] Avoid get location from observer when the block report is delayed.
> -----------------------------------------------------------------------------
>
>                 Key: HDFS-16732
>                 URL: https://issues.apache.org/jira/browse/HDFS-16732
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs
>    Affects Versions: 3.2.1
>            Reporter: zhengchenyu
>            Assignee: zhengchenyu
>            Priority: Critical
>              Labels: pull-request-available
>
> Hive on tez application fail occasionally after observer is enable, log show 
> below.
> {code:java}
> 2022-08-18 15:22:06,914 [ERROR] [Dispatcher thread {Central}] 
> |impl.VertexImpl|: Vertex Input: namenodeinfo_stg initializer failed, 
> vertex=vertex_1660618571916_4839_1_00 [Map 1]
> org.apache.tez.dag.app.dag.impl.AMUserCodeException: 
> java.lang.ArrayIndexOutOfBoundsException: 0
>       at 
> org.apache.tez.dag.app.dag.RootInputInitializerManager$InputInitializerCallback.onFailure(RootInputInitializerManager.java:329)
>       at 
> com.google.common.util.concurrent.Futures$CallbackListener.run(Futures.java:1056)
>       at 
> com.google.common.util.concurrent.DirectExecutor.execute(DirectExecutor.java:30)
>       at 
> com.google.common.util.concurrent.AbstractFuture.executeListener(AbstractFuture.java:1138)
>       at 
> com.google.common.util.concurrent.AbstractFuture.complete(AbstractFuture.java:958)
>       at 
> com.google.common.util.concurrent.AbstractFuture.setException(AbstractFuture.java:748)
>       at 
> com.google.common.util.concurrent.TrustedListenableFutureTask$TrustedFutureInterruptibleTask.afterRanInterruptibly(TrustedListenableFutureTask.java:133)
>       at 
> com.google.common.util.concurrent.InterruptibleTask.run(InterruptibleTask.java:80)
>       at 
> com.google.common.util.concurrent.TrustedListenableFutureTask.run(TrustedListenableFutureTask.java:78)
>       at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
>       at java.lang.Thread.run(Thread.java:748)
> Caused by: java.lang.ArrayIndexOutOfBoundsException: 0
>       at 
> org.apache.hadoop.mapred.FileInputFormat.identifyHosts(FileInputFormat.java:748)
>       at 
> org.apache.hadoop.mapred.FileInputFormat.getSplitHostsAndCachedHosts(FileInputFormat.java:714)
>       at 
> org.apache.hadoop.mapred.FileInputFormat.getSplits(FileInputFormat.java:378)
>       at 
> org.apache.hadoop.hive.ql.io.HiveInputFormat.addSplitsForGroup(HiveInputFormat.java:306)
>       at 
> org.apache.hadoop.hive.ql.io.HiveInputFormat.getSplits(HiveInputFormat.java:408)
>       at 
> org.apache.hadoop.hive.ql.exec.tez.HiveSplitGenerator.initialize(HiveSplitGenerator.java:159)
>       at 
> org.apache.tez.dag.app.dag.RootInputInitializerManager$InputInitializerCallable$1.run(RootInputInitializerManager.java:279)
>       at 
> org.apache.tez.dag.app.dag.RootInputInitializerManager$InputInitializerCallable$1.run(RootInputInitializerManager.java:270)
>       at java.security.AccessController.doPrivileged(Native Method)
>       at javax.security.auth.Subject.doAs(Subject.java:422)
>       at 
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1730)
>       at 
> org.apache.tez.dag.app.dag.RootInputInitializerManager$InputInitializerCallable.call(RootInputInitializerManager.java:270)
>       at 
> org.apache.tez.dag.app.dag.RootInputInitializerManager$InputInitializerCallable.call(RootInputInitializerManager.java:254)
>       at 
> com.google.common.util.concurrent.TrustedListenableFutureTask$TrustedFutureInterruptibleTask.runInterruptibly(TrustedListenableFutureTask.java:125)
>       at 
> com.google.common.util.concurrent.InterruptibleTask.run(InterruptibleTask.java:57)
>       ... 4 more {code}
> As describe in MAPREDUCE-7082, when the block is missing, then will throw 
> this exception, but my cluster had no missing block.
> In this example, I found getListing return location information. When block 
> report of observer is delayed, will return the block without location.
> HDFS-13924 is introduce to solve this problem, but only consider 
> getBlockLocations. 
> In observer node, all method which may return location should check whether 
> locations is empty or not.



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