hdfs-client.xml

<?xml version="1.0" encoding="UTF-8"?>

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<configuration>

<!-- KDC
	<property>
		<name>hadoop.security.authentication</name>
		<value>kerberos</value>
	</property>
KDC -->
	
<!-- HA
	<property>
		<name>dfs.nameservices</name>
		<value>phdcluster</value>
	</property>
	
	<property>
		<name>dfs.ha.namenodes.phdcluster</name>
		<value>nn1,nn2</value>
	</property>
	
	<property>
		<name>dfs.namenode.rpc-address.phdcluster.nn1</name>
		<value>mdw:9000</value>
	</property>
	
	<property>
		<name>dfs.namenode.rpc-address.phdcluster.nn2</name>
		<value>smdw:9000</value>
	</property>

	<property>
		<name>dfs.namenode.http-address.phdcluster.nn1</name>
		<value>mdw:50070</value>
	</property>
	
	<property>
		<name>dfs.namenode.http-address.phdcluster.nn2</name>
		<value>smdw:50070</value>
	</property>
	
HA -->

	<!-- RPC client configuration -->
	<property>
		<name>rpc.client.timeout</name>
		<value>3600000</value>
		<description>
		timeout interval of a RPC invocation in millisecond. default is 3600000.
		</description>
	</property>
	<property>
		<name>rpc.client.connect.tcpnodelay</name>
		<value>true</value>
		<description>
		whether set socket TCP_NODELAY to true when connect to RPC server. default is true.
		</description>
	</property>

	<property>
		<name>rpc.client.max.idle</name>
		<value>10000</value>
		<description>
		the max idle time of a RPC connection in millisecond. default is 10000.
		</description>
	</property>
	
	<property>
		<name>rpc.client.ping.interval</name>
		<value>10000</value>
		<description>
		the interval which the RPC client send a heart beat to server. 0 means disable, default is 10000.
		</description>
	</property>
	
	<property>
		<name>rpc.client.connect.timeout</name>
		<value>600000</value>
		<description>
		the timeout interval in millisecond when the RPC client is trying to setup the connection. default is 600000.
		</description>
	</property>
	
	<property>
		<name>rpc.client.connect.retry</name>
		<value>10</value>
		<description>
		the max retry times if the RPC client fail to setup the connection to server. default is 10.
		</description>
	</property>
	
	<property>
		<name>rpc.client.read.timeout</name>
		<value>3600000</value>
		<description>
		the timeout interval in millisecond when the RPC client is trying to read from server. default is 3600000.
		</description>
	</property>

	<property>
		<name>rpc.client.write.timeout</name>
		<value>3600000</value>
		<description>
		the timeout interval in millisecond when the RPC client is trying to write to server. default is 3600000.
		</description>
	</property>
	
	<property>
		<name>rpc.client.socket.linger.timeout</name>
		<value>-1</value>
		<description>
		set value to socket SO_LINGER when connect to RPC server. -1 means default OS value. default is -1.
		</description>
	</property>
	
	<!-- dfs client configuration -->
	<property>
		<name>dfs.client.read.shortcircuit</name>
		<value>true</value>
		<description>
		whether reading block file bypass datanode if the block and the client are on the same node. default is true.
		</description>
	</property>
	
	<property>
		<name>dfs.default.replica</name>
		<value>3</value>
		<description>
		the default number of replica. default is 3.
		</description>
	</property>
	
	<property>
		<name>dfs.prefetchsize</name>
		<value>10</value>
		<description>
		the default number of blocks which information will be prefetched. default is 10. 
		</description>
	</property>
	
	<property>
		<name>dfs.client.failover.max.attempts</name>
		<value>15</value>
		<description>
		if multiply namenodes are configured, it is the max retry times when the dfs client try to issue a RPC call. default is 15.
		</description>
	</property>
	
	<property>
		<name>dfs.default.blocksize</name>
		<value>134217728</value>
		<description>
		default block size. default is 134217728.
		</description>
	</property>
	
	<property>
		<name>dfs.client.log.severity</name>
		<value>INFO</value>
		<description>
		the minimal log severity level, valid values include FATAL, ERROR, INFO, DEBUG1, DEBUG2, DEBUG3. default is INFO.
		</description>
	</property>
	
	<!-- input client configuration -->
	<property>
		<name>input.connect.timeout</name>
		<value>600000</value>
		<description>
		the timeout interval in millisecond when the input stream is trying to setup the connection to datanode. default is 600000.
		</description>
	</property>
	
	<property>
		<name>input.read.timeout</name>
		<value>3600000</value>
		<description>
		the timeout interval in millisecond when the input stream is trying to read from datanode. default is 3600000.
		</description>
	</property>
	
	<property>
		<name>input.write.timeout</name>
		<value>3600000</value>
		<description>
		the timeout interval in millisecond when the input stream is trying to write to datanode. default is 3600000.
		</description>
	</property>
	
	<property>
		<name>input.localread.default.buffersize</name>
		<value>2097152</value>
		<description>
		number of bytes of the buffer which is used to hold the data from block file and verify checksum.
		it is only used when "dfs.client.read.shortcircuit" is set to true. default is 1048576.
		</description>
	</property>
	
	<property>
		<name>input.localread.blockinfo.cachesize</name>
		<value>1000</value>
		<description>
		the size of block file path information cache. default is 1000.
		</description>
	</property>
	
	<property>
		<name>input.read.getblockinfo.retry</name>
		<value>3</value>
		<description>
		the max retry times when the client fail to get block information from namenode. default is 3.
		</description>
	</property>
	
	<!-- output client configuration -->
	<property>
		<name>output.replace-datanode-on-failure</name>
		<value>false</value>
		<description>
		whether the client add new datanode into pipeline if the number of nodes in pipeline is less the specified number of replicas. default is false.
		</description>
	</property>
	
	<property>
		<name>output.default.chunksize</name>
		<value>512</value>
		<description>
		the number of bytes of a chunk in pipeline. default is 512.
		</description>
	</property>
	
	<property>
		<name>output.default.packetsize</name>
		<value>65536</value>
		<description>
		the number of bytes of a packet in pipeline. default is 65536.
		</description>
	</property>
	
	<property>
		<name>output.default.write.retry</name>
		<value>10</value>
		<description>
		the max retry times when the client fail to setup the pipeline. default is 10.
		</description>
	</property>
	
	<property>
		<name>output.connect.timeout</name>
		<value>600000</value>
		<description>
		the timeout interval in millisecond when the output stream is trying to setup the connection to datanode. default is 600000.
		</description>
	</property>
	
	<property>
		<name>output.read.timeout</name>
		<value>3600000</value>
		<description>
		the timeout interval in millisecond when the output stream is trying to read from datanode. default is 3600000.
		</description>
	</property>
	
	<property>
		<name>output.write.timeout</name>
		<value>3600000</value>
		<description>
		the timeout interval in millisecond when the output stream is trying to write to datanode. default is 3600000.
		</description>
	</property>

	<property>
		<name>output.packetpool.size</name>
		<value>1024</value>
		<description>
		the max number of packets in a file's packet pool. default is 1024.
		</description>
	</property>
	
	<property>
		<name>output.close.timeout</name>
		<value>900000</value>
		<description>
		the timeout interval in millisecond when close an output stream. default is 900000.
		</description>
	</property>

	<property>
		<name>dfs.domain.socket.path</name>
		<value>/var/lib/hadoop-hdfs/dn_socket</value>
		<description>
		Optional.  This is a path to a UNIX domain socket that will be used for
		communication between the DataNode and local HDFS clients.
		If the string "_PORT" is present in this path, it will be replaced by the
		TCP port of the DataNode.
		</description>
	</property>

	<property>
		<name>dfs.client.use.legacy.blockreader.local</name>
		<value>false</value>
		<description>
		Legacy short-circuit reader implementation based on HDFS-2246 is used
		if this configuration parameter is true.
		This is for the platforms other than Linux
		where the new implementation based on HDFS-347 is not available.
		</description>
	</property>

	<property>
		<name>dfs.encryption.key.provider.uri</name>
		<value>kms://http@localhost:16000/kms</value>
		<description>
		The KeyProvider to use when interacting with encryption keys used
		when reading and writing to an encryption zone.
		</description>
	</property>

</configuration>