Github user paul-guo- commented on a diff in the pull request: https://github.com/apache/incubator-hawq/pull/1243#discussion_r118226007 --- Diff: src/backend/executor/nodeShareInputScan.c --- @@ -793,15 +877,72 @@ shareinput_reader_waitready(int share_id, PlanGenerator planGen) } else if(n==0) { - elog(DEBUG1, "SISC READER (shareid=%d, slice=%d): Wait ready time out once", - share_id, currentSliceId); + file_exists = access(writer_lock_file, F_OK); + if(file_exists != 0) + { + elog(DEBUG3, "Wait lock file for writer time out interval is %d", timeout_interval); + if(timeout_interval >= share_input_scan_wait_lockfile_timeout || flag == true) //If lock file never exists or disappeared, reader will no longer waiting for writer + { + elog(LOG, "SISC READER (shareid=%d, slice=%d): Wait ready time out and break", + share_id, currentSliceId); + pfree(writer_lock_file); + break; + } + timeout_interval += tval.tv_sec; + } + else + { + elog(LOG, "writer lock file of shareinput_reader_waitready() is %s", writer_lock_file); + flag = true; + fd_lock = open(writer_lock_file, O_RDONLY); + if(fd_lock < 0) + { + elog(DEBUG3, "Open writer's lock file %s failed!, error number is %d", writer_lock_file, errno); + } + lock = flock(fd_lock, LOCK_EX | LOCK_NB); + if(lock == -1) + { --- End diff -- This is expected if I understand correctly so the log should be friendly (e.g. told users that this is expected).
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