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:

Nothing to list here.
Package nameClass namePatterns foundSolution coverageSummary coverage
org.apache.hadoop.hdfsDistributedFileSystem76
org.apache.hadoop.hdfsDFSClient67
org.apache.hadoop.hdfsDFSOutputStream$DataStreamer25
org.apache.hadoop.hdfsDFSInputStream18
org.apache.hadoop.hdfsDFSOutputStream14
org.apache.hadoop.hdfsNameNodeProxies6
org.apache.hadoop.hdfsBlockReaderFactory4
org.apache.hadoop.hdfsDistributedFileSystem$173
org.apache.hadoop.hdfsRemoteBlockReader23
org.apache.hadoop.hdfsHftpFileSystem2
org.apache.hadoop.hdfsHdfsConfiguration2
org.apache.hadoop.hdfsDistributedFileSystem$222
org.apache.hadoop.hdfsLeaseRenewer$11
org.apache.hadoop.hdfsHftpFileSystem$LsParser1
org.apache.hadoop.hdfsDistributedFileSystem$31
org.apache.hadoop.hdfsDistributedFileSystem$161
org.apache.hadoop.hdfsDistributedFileSystem$191
org.apache.hadoop.hdfsDistributedFileSystem$251
org.apache.hadoop.hdfsDFSUtil1
org.apache.hadoop.hdfsBlockReader1
Nothing to list here.
Nothing to list here.