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https://issues.apache.org/jira/browse/HDFS-16389?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wei-Chiu Chuang resolved HDFS-16389.
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Fix Version/s: 3.4.0
Resolution: Fixed
> Improve NNThroughputBenchmark test mkdirs
> -----------------------------------------
>
> Key: HDFS-16389
> URL: https://issues.apache.org/jira/browse/HDFS-16389
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: benchmarks, namenode
> Affects Versions: 2.9.2
> Reporter: JiangHua Zhu
> Assignee: JiangHua Zhu
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0
>
> Time Spent: 3h 10m
> Remaining Estimate: 0h
>
> When using the NNThroughputBenchmark test to create a large number of
> directories, some abnormal information will be prompted.
> Here is the command:
> ./bin/hadoop org.apache.hadoop.hdfs.server.namenode.NNThroughputBenchmark -fs
> hdfs://xxxx -op mkdirs -threads 30 -dirs 5000000
> There are some exceptions here, such as:
> 21/12/20 10:25:00 INFO namenode.NNThroughputBenchmark: Starting benchmark:
> mkdirs
> 21/12/20 10:25:01 INFO namenode.NNThroughputBenchmark: Generate 5000000
> inputs for mkdirs
> 21/12/20 10:25:08 ERROR namenode.NNThroughputBenchmark:
> java.lang.ArrayIndexOutOfBoundsException: 20
> at
> org.apache.hadoop.hdfs.server.namenode.FileNameGenerator.getNextDirName(FileNameGenerator.java:65)
> at
> org.apache.hadoop.hdfs.server.namenode.FileNameGenerator.getNextFileName(FileNameGenerator.java:73)
> at
> org.apache.hadoop.hdfs.server.namenode.NNThroughputBenchmark$MkdirsStats.generateInputs(NNThroughputBenchmark.java:668)
> at
> org.apache.hadoop.hdfs.server.namenode.NNThroughputBenchmark$OperationStatsBase.benchmark(NNThroughputBenchmark.java:257)
> at
> org.apache.hadoop.hdfs.server.namenode.NNThroughputBenchmark.run(NNThroughputBenchmark.java:1528)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:90)
> at
> org.apache.hadoop.hdfs.server.namenode.NNThroughputBenchmark.runBenchmark(NNThroughputBenchmark.java:1430)
> at
> org.apache.hadoop.hdfs.server.namenode.NNThroughputBenchmark.main(NNThroughputBenchmark.java:1550)
> Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 20
> at
> org.apache.hadoop.hdfs.server.namenode.FileNameGenerator.getNextDirName(FileNameGenerator.java:65)
> at
> org.apache.hadoop.hdfs.server.namenode.FileNameGenerator.getNextFileName(FileNameGenerator.java:73)
> at
> org.apache.hadoop.hdfs.server.namenode.NNThroughputBenchmark$MkdirsStats.generateInputs(NNThroughputBenchmark.java:668)
> at
> org.apache.hadoop.hdfs.server.namenode.NNThroughputBenchmark$OperationStatsBase.benchmark(NNThroughputBenchmark.java:257)
> at
> org.apache.hadoop.hdfs.server.namenode.NNThroughputBenchmark.run(NNThroughputBenchmark.java:1528)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:90)
> at
> org.apache.hadoop.hdfs.server.namenode.NNThroughputBenchmark.runBenchmark(NNThroughputBenchmark.java:1430)
> at
> org.apache.hadoop.hdfs.server.namenode.NNThroughputBenchmark.main(NNThroughputBenchmark.java:1550)
> These messages appear because some parameters are incorrectly set, such as
> dirsPerDir or filesPerDir.
> When we see this log, this will make us have some questions.
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