cndaimin opened a new pull request #3576:
URL: https://github.com/apache/hadoop/pull/3576


   This patch is tested by hdfs debug command:
   BEFORE:
   ```
   ~ $ hdfs debug
   Usage: hdfs debug <command> [arguments]
   
   These commands are for advanced users only.
   
   Incorrect usages may result in data loss. Use at your own risk.
   
   verifyMeta -meta <metadata-file> [-block <block-file>]
   
   Generic options supported are:
   -conf <configuration file>        specify an application configuration file
   -D <property=value>               define a value for a given property
   -fs <file:///|hdfs://namenode:port> specify default filesystem URL to use, 
overrides 'fs.defaultFS' property from configurations.
   -jt <local|resourcemanager:port>  specify a ResourceManager
   -files <file1,...>                specify a comma-separated list of files to 
be copied to the map reduce cluster
   -libjars <jar1,...>               specify a comma-separated list of jar 
files to be included in the classpath
   -archives <archive1,...>          specify a comma-separated list of archives 
to be unarchived on the compute machines
   
   The general command line syntax is:
   command [genericOptions] [commandOptions]
   
   computeMeta -block <block-file> -out <output-metadata-file>
   
   Generic options supported are:
   -conf <configuration file>        specify an application configuration file
   -D <property=value>               define a value for a given property
   -fs <file:///|hdfs://namenode:port> specify default filesystem URL to use, 
overrides 'fs.defaultFS' property from configurations.
   -jt <local|resourcemanager:port>  specify a ResourceManager
   -files <file1,...>                specify a comma-separated list of files to 
be copied to the map reduce cluster
   -libjars <jar1,...>               specify a comma-separated list of jar 
files to be included in the classpath
   -archives <archive1,...>          specify a comma-separated list of archives 
to be unarchived on the compute machines
   
   The general command line syntax is:
   command [genericOptions] [commandOptions]
   
   recoverLease -path <path> [-retries <num-retries>]
   
   Generic options supported are:
   -conf <configuration file>        specify an application configuration file
   -D <property=value>               define a value for a given property
   -fs <file:///|hdfs://namenode:port> specify default filesystem URL to use, 
overrides 'fs.defaultFS' property from configurations.
   -jt <local|resourcemanager:port>  specify a ResourceManager
   -files <file1,...>                specify a comma-separated list of files to 
be copied to the map reduce cluster
   -libjars <jar1,...>               specify a comma-separated list of jar 
files to be included in the classpath
   -archives <archive1,...>          specify a comma-separated list of archives 
to be unarchived on the compute machines
   
   The general command line syntax is:
   command [genericOptions] [commandOptions]
   
   
   Generic options supported are:
   -conf <configuration file>        specify an application configuration file
   -D <property=value>               define a value for a given property
   -fs <file:///|hdfs://namenode:port> specify default filesystem URL to use, 
overrides 'fs.defaultFS' property from configurations.
   -jt <local|resourcemanager:port>  specify a ResourceManager
   -files <file1,...>                specify a comma-separated list of files to 
be copied to the map reduce cluster
   -libjars <jar1,...>               specify a comma-separated list of jar 
files to be included in the classpath
   -archives <archive1,...>          specify a comma-separated list of archives 
to be unarchived on the compute machines
   
   The general command line syntax is:
   command [genericOptions] [commandOptions]
   ```
   
   AFTER:
   ```
   ~ $ hdfs debug
   Usage: hdfs debug <command> [arguments]
   
   These commands are for advanced users only.
   
   Incorrect usages may result in data loss. Use at your own risk.
   
   verifyMeta -meta <metadata-file> [-block <block-file>]
   computeMeta -block <block-file> -out <output-metadata-file>
   recoverLease -path <path> [-retries <num-retries>]
   verifyEC -file <file>
   
   Generic options supported are:
   -conf <configuration file>        specify an application configuration file
   -D <property=value>               define a value for a given property
   -fs <file:///|hdfs://namenode:port> specify default filesystem URL to use, 
overrides 'fs.defaultFS' property from configurations.
   -jt <local|resourcemanager:port>  specify a ResourceManager
   -files <file1,...>                specify a comma-separated list of files to 
be copied to the map reduce cluster
   -libjars <jar1,...>               specify a comma-separated list of jar 
files to be included in the classpath
   -archives <archive1,...>          specify a comma-separated list of archives 
to be unarchived on the compute machines
   
   The general command line syntax is:
   command [genericOptions] [commandOptions]
   ```


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