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Overall reduce phase time: If the reduce phase is very long, you may want to tailor the number of reduce tasks per job and per machine. The job may specify the number of reduce tasks to run, but at least through Hadoop 0.19.1, the number of reduce tasks per TaskTracker is fixed at start time. If your cluster will run a specific set of jobs, with experimentation, you may find a reasonable number for the cluster-level parameter, and given that, identify a specific value for the number of reduce tasks for each job.

The HTML5 Canvas API wouldn t be powerful or popular if developers were stuck using simple stick drawings and black lines. Let s use the stroke styling capabilities to make our canopy a little more treelike. Listing 2-10 shows some basic commands that can modify the properties of the context in order to make the stroked shape look more appealing. Listing 2-10. Using a stroke style // Increase the line width context.lineWidth = 4; // Round the corners at path joints context.lineJoin = 'round'; // Change the color to brown context.strokeStyle = '#663300'; // Finally, stroke the canopy context.stroke(); By adding the above properties before stroking, we change the appearance of any future stroked shapes at least until we restore the context back to a previous state. First, we increase the width of the stroked lines to four pixels. Next, we set the lineJoin property to round, which causes the joints of our shape s segments to take on a more rounded corner shape. We could also set the lineJoin to bevel or miter (and the corresponding context.miterLimit value to tweak it) to choose other corner options. Finally, we change the color of the stroke by using the strokeStyle property. In our example, we are setting the color to a CSS value, but as you will see in later sections, it is also possible to set the strokeStyle to be an image pattern or a gradient for fancier displays. Although we are not using it here, we could also set the lineCap property to be either butt, square, or round to specify how lines should display at the endpoints. Alas, our example has no dangling line ends. Figure 2-7 shows our spruced-up tree canopy, now stroked with a wider, smoother, brown line instead of the flat black line from before.

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One of the more interesting things to see is a cluster going almost idle while a job is running. This usually happens because a small number of tasks have not finished. This situation is called the job tail. This can happen with the map tasks or the reduce tasks. With multithreaded map tasks, the key or keys passed to one thread can sometimes take much longer to finish, and the task needs to wait for one or a small number of threads to complete, leaving the machine mostly idle. This is called the task tail.

A transaction is a unit of work guaranteed to behave as if you had exclusive use of the database. If you wrap your work in a transaction, the behavior of other system users will not affect your data. A transaction can be started, committed to write data to the database, or rolled back to remove all changes from the beginning onward (usually as the result of an error). To achieve this, you obtain a Transaction object from the database (beginning the transaction) and manipulate this: Session session = factory.openSession(); Transaction tx = null; try { tx = session.beginTransaction(); // Normal session usage here... tx.commit(); tx = null; } catch (HibernateException e) { if (tx != null) tx.rollback(); } finally { session.close(); } In the real world, transactions are not truly ACID because you can adjust how compliant your transaction will be; however, in a perfect world, all transactions would be carried out strictly observing these rules with no ill effects. Most databases supported by Hibernate support the ACID requirements of relational theory as closely as possible. Different database suppliers support and permit you to break the ACID rules to a lesser or greater extent, but the degree of control over the isolation rule is actually mandated by the SQL-92 standard. There are important reasons why you might want to break this rule, so both JDBC and Hibernate also make explicit allowances for it.

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