Apache Hadoop HDFS errors

The Hadoop Distributed File System (HDFS) is a distributed file system designed to run on commodity hardware

https://hadoop.apache.org/docs/r1.2.1/hdfs_design.html
Solution coverage:
Summary coverage:

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Package nameClass namePatterns foundSolution coverageSummary coverage
org.apache.hadoop.hdfsDistributedFileSystem68
org.apache.hadoop.hdfsDFSOutputStream$DataStreamer59
org.apache.hadoop.hdfsDFSClient47
org.apache.hadoop.hdfsDFSInputStream14
org.apache.hadoop.hdfsDFSOutputStream12
org.apache.hadoop.hdfsNameNodeProxies7
org.apache.hadoop.hdfsDFSOutputStream$DataStreamer$ResponseProcessor5
org.apache.hadoop.hdfsBlockReaderFactory4
org.apache.hadoop.hdfsRemoteBlockReader23
org.apache.hadoop.hdfsHdfsConfiguration2
org.apache.hadoop.hdfsDistributedFileSystem$172
org.apache.hadoop.hdfsDistributedFileSystem$222
org.apache.hadoop.hdfsHftpFileSystem2
org.apache.hadoop.hdfsDistributedFileSystem$161
org.apache.hadoop.hdfsBlockReader1
org.apache.hadoop.hdfsDistributedFileSystem$251
org.apache.hadoop.hdfsDistributedFileSystem$191
org.apache.hadoop.hdfsDistributedFileSystem$31
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