Each resource is named by either a String or by a Path. If named by a String , then the classpath is examined for a file with that name. If named by a Path , then the local filesystem is examined directly, without referring to the classpath. Unless explicitly turned off, Hadoop by default specifies two resources, loaded in-order from the classpath: core-default. Applications may add additional resources, which are loaded subsequent to these resources in the order they are added.
Final Parameters Configuration parameters may be declared final. Once a resource declares a value final, no subsequently-loaded resource can alter that value. Variable Expansion Value strings are first processed for variable expansion. The available properties are: Other properties defined in this Configuration; and, if a name is undefined here, Environment variables in System. When conf. By default, warnings will be given to any deprecated configuration parameters and these are suppressible by configuring log4j.
Tags Optionally we can tag related properties together by using tag attributes. System tags are defined by hadoop. Users can define there own custom tags in hadoop. This is an optimized version of getStrings String Parameters: name - property name.
Returns: property value as a collection of String s. If no such property is specified then null is returned. Parameters: name - property name. Returns: property value as an array of String s, or null. If no such property is specified then default value is returned.
If no such property is specified then empty Collection is returned. Returns: property value as a collection of String s, or empty Collection getTrimmedStrings public String [] getTrimmedStrings String name Get the comma delimited values of the name property as an array of String s, trimmed of the leading and trailing whitespace. If no such property is specified then an empty array is returned. Returns: property value as an array of trimmed String s, or empty array.
In order to enable the elimination of clear text passwords in config, this method attempts to resolve the property name as an alias through the CredentialProvider API and conditionally fallsback to config.
Parameters: name - alias of the provisioned credential Returns: password or null if not found Throws: IOException - when error in fetching password getPasswordFromConfig protected char[] getPasswordFromConfig String name Fallback to clear text passwords in configuration.
If hostProperty is null , addressProperty will be used. This is useful for cases where we want to differentiate between host bind address and address clients should use to establish connection. Parameters: hostProperty - bind host property name.
The wildcard address is replaced with the local host's address. If the host and address properties are configured the host component of the address will be combined with the port component of the addr to generate the address.
This is to allow optional control over which host name is used in multi-home bind-host cases where a host can have multiple names Parameters: hostProperty - the bind-host configuration name addressProperty - the service address configuration name defaultAddressValue - the service default address configuration value addr - InetSocketAddress of the service listener Returns: InetSocketAddress for clients to connect updateConnectAddr public InetSocketAddress updateConnectAddr String name, InetSocketAddress addr Set the socket address a client can use to connect for the name property as a host:port.
Parameters: name - the class name. Returns: the class object. Throws: ClassNotFoundException - if the class is not found. This is to avoid the overhead of creating an exception. Parameters: name - the class name Returns: the class object, or null if it could not be found.
The value of the property specifies a list of comma separated class names. If no such property is specified, then defaultValue is returned. Parameters: name - the property name. Returns: property value as a Class[] , or defaultValue.
Parameters: name - the conf key name. Returns: property value as a Class , or defaultValue. An exception is thrown if the returned class does not implement the named interface.
An exception is thrown if any of the classes does not exist, or if it does not implement the named interface. Returns: a List of objects implementing xface. An exception is thrown if theClass does not implement the interface xface. If dirsProp contains multiple directories, then one is chosen based on path 's hash code.
If the selected directory does not exist, an attempt is made to create it. Parameters: dirsProp - directory in which to locate the file. Returns: local file under the directory with the given path. Parameters: name - resource name. Returns: the url for the named resource. Parameters: name - configuration resource name. Returns: an input stream attached to the resource. Returns: a reader attached to the resource.
Returns: final parameter set. Returns: number of keys in the configuration. Property names in the mapping are trimmed to remove the configuration prefix.
Parameters: out - the output stream to write to. When property name is not empty and the property exists in the configuration, this method writes the property and its attributes to the Writer. When property name is null or empty, this method writes all the configuration properties and their attributes to the Writer. When property name is not empty but the property doesn't exist in the configuration, this method throws an IllegalArgumentException.
Parameters: out - the writer to write to. Learn more. Configuration does not exist in hadoop-core. Asked 8 years, 3 months ago. Active 8 years, 3 months ago. Viewed 24k times. I am writing an HBase client in Java. The first line, of coz, looks like this: import org. Improve this question. Shengjie Shengjie Why does your hbase not use a CDH version? Such as 0. I just updated it to cdh version as well.
But as expected, that would make any difference in this case. Use DistributedCacheManager instead. Get a FileSystem instance based on the uri, the passed in configuration and the user.
Get an instance of the configured TrashPolicy based on the value of the configuration parameter fs. Use TrashPolicy. In case of the symlinks or mount points, one has to move the appropriate trashbin in the actual volume of the path p being deleted.
Returns a unique configured FileSystem implementation for the default filesystem of the supplied configuration. This method is provided for convenience for derived classes to define custom AzureADTokenProvider instance. The credentials here must include a session token, else this operation will raise an exception. Constructor: the URI will be null if the provider is inited unbonded to a filesystem.
Use SequenceFile. Get a comparator for a WritableComparable implementation. Find and load the class with given name className by first finding it in the specified conf.
Read a Writable , String , primitive type, or an array of the preceding. Write a Writable , String , primitive type, or an array of the preceding. Get the list of codecs discovered via a Java ServiceLoader, or listed in the configuration. Get a Compressor for the given CompressionCodec from the pool or a new one. Prepare the compressor to be used in a new stream with settings defined in the given Configuration. Find the codecs specified in the config value io. Get the ping interval from configuration; If not set in the configuration, return the default value.
Construct an IPC client whose values are of the given Writable class. Get the flag which if set to true, SkipBadRecords. Get the number of acceptable skip records surrounding the bad record PER bad record in mapper.
Get the number of acceptable skip groups surrounding the bad group PER bad group in reducer. Set the flag which if set to true, SkipBadRecords. Set the number of acceptable skip records surrounding the bad record PER bad record in mapper. Set the number of acceptable skip groups surrounding the bad group PER bad group in reducer. Build a job client with the given Configuration , and connect to the default cluster.
Use Job. Creates a new Job with no particular Cluster and a given Configuration. Creates a new Job with no particular Cluster and a given jobName. Adds a Mapper class to the chain reducer. Adds a Mapper class to the chain mapper. Sets the Reducer class to the chain job.
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