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...uring fop processing. Again asynchronous nature can be achieved using single or multiple threads. The first approach is effective only when there are blocking components in the system, like I/O with network or disk. Performance translators does not do anything helpful in this aspect (STACK_WIND and STACK_UNWIND macros, non-blocking sockets etc help here). It is in introducing parallel processing as call proceeds through gluster translator graph where io-threads (a performance translator) comes into picture. Apart from introducing parallelism, io-threads implements priority based processing of fops, which...