(also been reading up on this code a bit just now) That's weird. It seems to be using TThreadPoolServer and that seems to just service all requests from a single connection in one thread. (and uses the same processor I assume that seems to initialize the session state in the interface constructor)
Are ur execute calls happening on the same connection? ________________________________ From: Min Zhou [mailto:coderp...@gmail.com] Sent: Monday, March 09, 2009 8:03 PM To: hive-user@hadoop.apache.org Subject: thread cofinement session state Hi list, I found each invoke of HiveServer's execute method run in different threads. Those threads which execute a HSQL query(not a client connection may execute several pieces of queries), have not their own session state. when I call SessionState.get(), it will return null beacuse session state on this thread hadnot been constructed before. see also fragment of ExecDriver.java: public static String getRealFiles(Configuration conf) { // fill in local files to be added to the task environment SessionState ss = SessionState.get(); // return ss will get null !!! ... } Is it a bug? Thanks, Min -- My research interests are distributed systems, parallel computing and bytecode based virtual machine. http://coderplay.javaeye.com
