Hi can anyone suggeset why i get backend connection failed when N-Worker_thread
goes anything above default of 100 worker_thread?
While trying to create 491 thread in peak it was unable to connect to
backend.whereas, backend servers were not in load or anything.
As i understood, while thread max is 1000 * 2[pools], and varnish server load
is below 1, theoritically it should be able to handle that many spikes, And i
would not see why backend would fail here.
Also, Due to demand of use, it is designed to cache 1s to 5s at most.
n_worker_thread = 100 , all goodn_worker_thread = 491 , 8 backend_connection
failure.
varnishadm
thread_pool_add_delay 2 [milliseconds]thread_pool_add_threshold 2
[requests]thread_pool_fail_delay 200 [milliseconds]thread_pool_max
1000 [threads]thread_pool_min 50
[threads]thread_pool_purge_delay 1000 [milliseconds]thread_pool_stack
unlimited [bytes]thread_pool_timeout 120
[seconds]thread_pool_workspace 65536 [bytes]thread_pools 2
[pools]thread_stats_rate 10 [requests]
varnishstat32+03:45:05Hitrate ratio: 2 2 2Hitrate avg:
0.9404 0.9404 0.9404
backend_conn 4516262 1.63 Backend conn.
successbackend_unhealthy 0 0.00 Backend conn. not
attemptedbackend_busy 0 0.00 Backend conn. too
manybackend_fail 9562 0.00 Backend conn.
failuresbackend_reuse 67350518 24.24 Backend conn.
reusesbackend_toolate 361647 0.13 Backend conn. was
closedbackend_recycle 67715544 24.38 Backend conn.
recyclesbackend_retry 5133 0.00 Backend conn.
retryn_backend 5 . N backendsbackend_req
71855086 25.87 Backend requests madeLCK.backend.creat 5
0.00 Created locksLCK.backend.destroy 0 0.00 Destroyed
locksLCK.backend.locks 149007648 53.64 Lock
OperationsLCK.backend.colls 0 0.00 Collisions
RegardsTikejhya
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