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"-e /path/to/tmpfsmnt/file"
SIGUSR1 for graceful stop
restart requires the same memory limit, slab sizes, and some other
infrequently changed details. Most other options and features can
change between restarts. Binary can be upgraded between restarts.
Restart does some fixup work on start for every item in cache. Can take
over a minute with more than a few hundred million items in cache.
Keep in mind when a cache is down it may be missing invalidations,
updates, and so on.
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LRU crawler metadumper is used for getting snapshot-y looks at the LRU's.
Since there's no default limit, it'll get any new items added or bumped since
the roll started.
with this change it limits the number of items dumped to the number that
existed in that LRU when the roll was kicked off. You still end up with an
approximation, but not a terrible one:
- items bumped after the crawler passes them likely won't be revisited
- items bumped before the crawler passes them will likely be visited toward
the end, or mixed with new items.
- deletes are somewhere in the middle.
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removes a few ifdef's and upstreams small internal interface tweaks for easy
rebase.
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when trying to manually run a crawl, the internal autocrawler is now blocked
from restarting for 60 seconds.
the internal autocrawl now independently schedules LRU's, and can re-schedule
sub-LRU's while others are still running. should allow much better memory
control when some sub-lru's (such as TEMP or WARM) are small, or slab classes
are differently sized.
this also makes the crawler drop its lock frequently.. this fixes an issue
where a long crawl happening at the same time as a hash table expansion could
hang the server until the crawl finished.
to improve still:
- elapsed time can be wrong in the logger entry
- need to cap number of entries scanned. enough set pressure and a crawl may
never finish.
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~600 lines gone from items.c makes it a lot more manageable.
this change is almost purely moving code around and renaming functions. very
little logic has changed.
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