Hadoop forces to write pure functions, your code mustn't aware of any
state. It gets X and returns Y.
There should be no problem with static.
2013/7/25 Huy Pham <[EMAIL PROTECTED]>
> Hi All,
> I am writing a class (called Parser) with a couple of static functions
> because I don't want millions of instances of this class to be created
> during the run.
> However, I realized that Hadoop will eventually produce parallel jobs,
> and if all jobs will call static functions of this Parser class, would that
> be safe?
> In other words, will all hadoop jobs share the same class Parser or
> will each of them have their own Parser? In the former case, if all jobs
> share the same class, then if I make the methods synchronized, then the
> jobs would need to wait until the locks to the functions are released, thus
> that would affect the performance. However, in later case, that would not
> cause any problem.
> Can someone provide some insights?