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realize that the newly installed machines had a default firewall that blocked the HDFS port. Listing 4-5 shows an excerpt from a DataNode log for a DataNode that failed to start due to network connectivity problems. listing 4-5. DataNode Log Excerpt, Failure to Connect to the NameNode INFO org.apache.hadoop.hdfs.server.datanode.DataNode: STARTUP_MSG: /************************************************************ STARTUP_MSG: Starting DataNode STARTUP_MSG: host = slave1/127.0.0.1 STARTUP_MSG: args = [] STARTUP_MSG: version = 0.19.1-dev STARTUP_MSG: build = ************************************************************/ INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/192.168.1.2:8020. Already tried 0 time(s). INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/192.168.1.2:8020. Already tried 1 time(s). INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/192.168.1.2:8020. Already tried 2 time(s). INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/192.168.1.2:8020. Already tried 3 time(s). INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/192.168.1.2:8020. Already tried 4 time(s). INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/192.168.1.2:8020. Already tried 5 time(s). INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/192.168.1.2:8020. Already tried 6 time(s). INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/192.168.1.2:8020. Already tried 7 time(s). INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/192.168.1.2:8020. Already tried 8 time(s). INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/192.168.1.2:8020. Already tried 9 time(s). ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: Call to master/192.168.1.2:8020 failed on local exception: No route to host at org.apache.hadoop.ipc.Client.call(Client.java:699) at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:216) at $Proxy4.getProtocolVersion(Unknown Source) at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:319) at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:306) at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:343) at org.apache.hadoop.ipc.RPC.waitForProxy(RPC.java:288) at org.apache.hadoop.hdfs.server.datanode.DataNode. startDataNode(DataNode.java:258)

A device can use any of the following sources: IP address Coordinate triangulation Global Positioning System (GPS) Wi-Fi with MAC addresses from RFID, Wi-Fi, and Bluetooth GSM or CDMA cell phone IDs

at org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:205) at org.apache.hadoop.hdfs.server.datanode.DataNode. makeInstance(DataNode.java:1199) at org.apache.hadoop.hdfs.server.datanode.DataNode. instantiateDataNode(DataNode.java:1154) at org.apache.hadoop.hdfs.server.datanode.DataNode. createDataNode(DataNode.java:1162) at org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1284) Caused by: java.net.NoRouteToHostException: No route to host at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:574) at sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:100) at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:299) at org.apache.hadoop.ipc.Client$Connection.access$1700(Client.java:176) at org.apache.hadoop.ipc.Client.getConnection(Client.java:772) at org.apache.hadoop.ipc.Client.call(Client.java:685) ... 12 more INFO org.apache.hadoop.hdfs.server.datanode.DataNode: SHUTDOWN_MSG: /************************************************************ SHUTDOWN_MSG: Shutting down DataNode at at/127.0.0.1 ************************************************************/

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The difference is that the get() method will return null if the unique id is not found The get() methods are public Object get(Class clazz, Serializable id) throws HibernateException public Object get(String entityName, Serializable id) throws HibernateException public Object get(Class clazz, Serializable id, LockMode lockMode) throws HibernateException public Object get(String entityName, Serializable id, LockMode lockMode) throws HibernateException If you would like to retrieve the entity name for a given object, you can use the getEntityName() method on the Session interface: public String getEntityName(Object object) throws HibernateException Using the get() methods and the load() methods is straightforward For the following code sample, we would be getting the Supplier id from another Java class; for instance through a web application, someone may select a Supplier details page for the supplier with the id 1.

note It is important to note the IP address to which the DataNode is trying to connect. If the IP address is

Many devices use a combination of one or more sources to ensure an even higher accuracy. Each of these methods has its own pros and cons, as explained in the next sections.

Hadoop also provides the dfsadmin -report command-line tool, which will provide a somewhat verbose listing of the DataNodes in a service. You can run this useful script from your system monitoring tools, so that alerts can be generated if DataNodes go offline. The following is an example run of this tool: bin/hadoop dfsadmin -report

Configured Capacity: 190277042176 (177.21 GB) Present Capacity: 128317767680 (119.51 GB) DFS Remaining: 128317718528 (119.51 GB) DFS Used: 49152 (48 KB) DFS Used%: 0%

If we are not sure that the supplier exists, we use the get() method, where we could check for null: // get an id from some other Java class, for instance, through a web application Supplier supplier = (Supplier) sessionget(Supplierclass,id); if (supplier == null) { Systemoutprintln("Supplier not found for id " + id); return; } We can also retrieve the entity name from Hibernate and use it with either the get() or the load() methods Remember that the load() method will throw an exception if an object with that id cannot be found: String entityName = sessiongetEntityName(supplier); Supplier secondarySupplier = (Supplier) sessionload(entityName,id);.

------------------------------------------------Datanodes available: 5 (5 total, 0 dead) Name: 192.168.1.3:50010 Decommission Status : Normal Configured Capacity: 177809035264 (165.6 GB) DFS Used: 24576 (24 KB) Non DFS Used: 50479497216 (47.01 GB) DFS Remaining: 127329513472(118.58 GB) DFS Used%: 0% DFS Remaining%: 71.61% Last contact: Wed Jan 28 08:27:20 GMT-08:00 2009 ...

In the past, IP address based geolocation was the only way to get a possible location, but the returned locations often proved unreliable. IP address based geolocation works by automatically looking up a user s IP address and then retrieving the registrant's physical address. Therefore, if you have an ISP that provides you with an IP address, your location is often resolved to the physical address of your service provider that could be miles away. Table 4-1 shows the pros and cons of IP address based geolocation data. Table 4-1.Pros and cons of IP address based geolocation data

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