229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
|
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
|
-
-
+
+
|
(thread-sleep! delay-wait)))))
(case status
((busy) ;; result will be how long the server wants you to delay
(debug:print 0 *default-log-port* "WARNING: server for "dbfname" is overloaded, will try again in "result" seconds.")
(thread-sleep! (if (number? result) result 2))
(tt:handler ttdat cmd run-id params (+ attemptnum 1) area-dat areapath readonly-mode dbfname testsuite mtexe))
((loaded)
(debug:print 0 *default-log-port* "WARNING: server for "dbfname" is loaded, will try again in a 1/4 second.")
(tt:backoff-incr (tt-host conn)(tt-port conn))
(debug:print 0 *default-log-port* "WARNING: server for "dbfname" is loaded, slowing queries.")
(tt:backoff-incr (tt-conn-host conn)(tt-conn-port conn))
result) ;; (tt:handler ttdat cmd run-id params (+ attemptnum 1) area-dat areapath readonly-mode dbfname testsuite mtexe))
(else
result)))
(else ;; did not receive properly formated result
(if (not res) ;; tt:handler is telling us that communication failed
(let* ((host (tt-conn-host conn))
(port (tt-conn-port conn))
|
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
|
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
|
-
+
+
-
+
|
(let* ((host-port (conc host":"port))
(bkoff (hash-table-ref/default *tt:backoff-smoothing* host-port #f)))
(if bkoff
(let* ((wait-delay (tt:backoff-wait-delay bkoff))
(last-ioerr (tt:backoff-last-ioerr bkoff))
(last-adj-t (tt:backoff-last-adj-t bkoff))
(delta (- (current-seconds) last-adj-t))
(adj (* delta 0.01)) ;; it takes ten seconds to recover from hitting an io err
(adj (* delta 0.001)) ;; it takes 100 seconds to recover from hitting an io err
(new-wait (if (> wait-delay 0)
(if (> adj wait-delay)
0
(- wait-delay adj))
0)))
(if (> new-wait 0)
(begin
(if (common:low-noise-print 10 "delay wait message")
(debug:print-info 0 *default-log-port* "Server loaded, DelayWait: "new-wait)
(debug:print-info 0 *default-log-port* "Server loaded, DelayWait: "new-wait))
(tt:backoff-wait-delay-set! bkoff new-wait)
(tt:backoff-last-adj-t-set! bkoff (current-seconds))
(thread-sleep! new-wait))
(hash-table-delete! *tt:backoff-smoothing* host-port))))))
(define (tt:send-receive-direct host port dat #!key (ping-mode #f)(tries-remaining 25))
(assert (number? port) "FATAL: tt:send-receive-direct called with port not a number "port)
|
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
|
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
|
-
+
|
(full-err-print exn "ERROR: i/o error")
(tt:backoff-incr host port)
#f)
(exn (i/o net)
(if ping-mode
#f
(if (>= tries-remaining 0)
(let* ((backoff-delay (* (- 26 tries-remaining) 0.5)))
(let* ((backoff-delay (* (- 26 tries-remaining) 0.1)))
(debug:print 0 *default-log-port* "WARNING: TCP overload, trying again in "backoff-delay"s.")
(thread-sleep! backoff-delay)
(tt:backoff-incr host port)
(retry))
(assert #f "FATAL: Too many retries in tt:send-receive-direct"))))
(exn ()
(full-err-print exn "Unhandled exception from client side.")
|