Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 388 by [email protected]: lru_crawler - daemon hangs
https://code.google.com/p/memcached/issues/detail?id=388
What steps will reproduce the problem?
1. Start memcached with lru_crawler enabled:
memcached -l 127.0.0.1 -p 65000 -o lru_crawler -d -u nobody
2. Store several keys with small expire time and wait when expiration time
leaved.
3. Start craler with "lru_crawler crawl all"
4. No items crawled, but there is expired unfetched items in stats command.
4. Try to disable crawler - there is error.
5. Try to restart crawler - daemon hangs.
What is the expected output? What do you see instead?
4. Show stats - you see than "STAT lru_crawler_running 1" but "STAT
crawler_reclaimed 0" and there is expired items in cache.
5. Telnet to daemon and try to stop crawler:
lru_crawler disable
ERROR failed to stop lru crawler thread
6. Try to start crawler:
lru_crawler crawl all
OK
add a 0 1 1
1
...
daemon hangs
What version of the product are you using? On what operating system?
Memcached 1.4.21
CentOS 6.5
Please provide any additional information below.
Memcached daemon use 100% cpu per thread. Strace output:
epoll_wait(3, {}, 32, 108) = 0
epoll_wait(3, {}, 32, 1000) = 0
epoll_wait(3, {}, 32, 1000) = 0
...
epoll_wait(3, {}, 32, 1000) = 0
...
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