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One handy way to use the HTML5 Form validation support for custom validators is to implement the common technique of verifying passwords during a password change. The standard technique is to provide two password fields which must match before the form is submitted successfully. Here, we provide a way to utilize the setCustomValidation call to make sure that two password fields are matched before the form submits. Recall that the customError validation constraint gives you a chance to set an error on a form control whenever the standard constraint rules do not apply. Specifically, one good reason to trigger the customError constraint is when the validation depends on the concurrent state of multiple controls, such as the two password fields here. Because the ValidityState object is assumed to be live once a reference to it is obtained, it is a good idea to set the custom error on the ValidityState whenever the password fields are mismatched and immediately clear the error whenever the fields match again. A good approach for achieving this is to use the onchange event handler for the password fields. <form name="passwordChange"> <p><label for="password1">New Password:</label> <input type="password" id="password1" onchange="checkPasswords()"></p> <p><label for="password2">Confirm Password:</label> <input type="password" id="password2" onchange="checkPasswords()"></p> </form> As you can see here, on a trivial form with two password fields, we can register a function to execute every time the value of one of the passwords changes. function checkPasswords() { var pass1 = document.getElementById("password1"); var pass2 = document.getElementById("password2"); if (pass1.value != pass2.value) pass1.setCustomValidity("Your passwords do not match. Please recheck that your new password is entered identically in the two fields."); else pass1.setCustomValidity(""); }

The only issue I encountered when running Hive was a problem with a missing JAR because of an error I introduced into the conf/hadoop-env.sh file (see Listing 10-1). listing 10-1. Hive Configuration Error jason@cloud9:~/src/hadoop-0.19/contrib/hive$ bin/hive

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Saves an object to the database. Saves an object to the database, or updates the database if it already exists. Reassociates an object with the session so that updates to it will be persisted. Retrieves a specific object from the database by the object s identifier. Determines the identifier for a specific object associated with the session. Loads an object from the database by the object s identifier (you should use the get method if you are not certain it is in the database). Refreshes the state of an object from the database. Updates the database with changes to an object. Deletes an object from the database. Creates a filter to narrow operations on the database. Creates a Hibernate query to be applied to the database.

java.lang.NoClassDefFoundError: org/apache/hadoop/hive/conf/HiveConf at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:247) at org.apache.hadoop.util.RunJar.main(RunJar.java:158) at org.apache.hadoop.mapred.JobShell.run(JobShell.java:54) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79) at org.apache.hadoop.mapred.JobShell.main(JobShell.java:68) Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.hive.conf.HiveConf at java.net.URLClassLoader$1.run(URLClassLoader.java:200) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) ... 7 more I modified the conf/hadoop-env.sh file to set the HADOOP_CLASSPATH (see Listing 10-2) when I was testing the scheduler services in 8. The contrib/hive/bin/hive script sets HADOOP_CLASSPATH with the set of JARs that Hive requires and then invokes the bin/hadoop script to start the Hive command-line interpreter. listing 10-2. Incorrect Modification of the HADOOP_CLASSPATH Setting in conf/hadoop-env.sh # Extra Java CLASSPATH elements. Optional. export HADOOP_CLASSPATH=${HADOOP_HOME}/contrib/capacity-scheduler/ hadoop-0.19-capacity-scheduler.jar I corrected the error (see Listing 10-3), and Hive started correctly (see Listing 10-4). listing 10-3. Corrected Setting for HADOOP_CLASSPATH in conf/hadoop-env.sh # Extra Java CLASSPATH elements. Optional. export HADOOP_CLASSPATH=${HADOOP_HOME}/contrib/ capacity-scheduler/hadoop-0.19-capacity-scheduler.jar:${HADOOP_CLASSPATH}

moveTo(x, y): moves the current location to a new destination of (x, y) without drawing. lineTo(x, y): moves the current location to a new destination of (x, y) drawing a straight line from the current position to the new one.

listing 10-4. Hive Starts Correctly After Constructing the Required HDFS Path Elements with the Correct Permissions jason@cloud9:~/src/hadoop-0.19/contrib/hive$ bin/hive

Transactions and Locking Begins a transaction. Gets a database lock for an object (or can be used like persist if LockMode.NONE is given).

hive> The examples listed in the wiki page http://wiki.apache.org/hadoop/Hive/ GettingStarted did not work particularly well for me (they might be updated by the time you read this chapter).

Essentially, the difference between these two calls is that the first is akin to lifting a drawing pen and moving to a new location, whereas the second tells the canvas to leave the pen on the paper and move it in a straight line to the new destination However, it is worth pointing out again that no actual drawing occurs until you stroke or fill the path At present, we are merely defining the positions in our path so that it can be drawn later The next special pathing function is a call to closePath This command is very similar in behavior to the lineTo function, with the difference being that the destination is automatically assumed to be the origination of the path However, the closePath also informs the canvas that the current shape has closed or formed a completely contained area.

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