Commit Graph

14 Commits

Author SHA1 Message Date
beorn7 a90d645378 Checkpoint fingerprint mappings only upon shutdown
Before, we checkpointed after every newly detected fingerprint
collision, which is not a problem as long as collisions are
rare. However, with a sufficient number of metrics or particular
nature of the data set, there might be a lot of collisions, all to be
detected upon the first set of scrapes, and then the checkpointing
after each detection will take a quite long time (it's O(n²),
essentially).

Since we are rebuilding the fingerprint mapping during crash recovery,
the previous, very conservative approach didn't even buy us
anything. We only ever read from the checkpoint file after a clean
shutdown, so the only time we need to write the checkpoint file is
during a clean shutdown.
2016-04-15 01:03:28 +02:00
Jonathan Boulle 38098f8c95 Add missing license headers
Prometheus is Apache 2 licensed, and most source files have the
appropriate copyright license header, but some were missing it without
apparent reason. Correct that by adding it.
2016-04-13 16:08:22 +02:00
Fabian Reinartz e3b6ec9784 Switch to common/log 2015-10-03 10:21:43 +02:00
Fabian Reinartz 306e8468a0 Switch from client_golang/model to common/model 2015-08-21 13:33:38 +02:00
beorn7 dbcb3d9333 Use an RW lock to checkpoint fingerprint mappings.
This has to be backported to 0.13.x.
2015-05-23 14:05:05 +02:00
beorn7 3b9ab546e6 Add metrics to count inconsistencies and fp collisions. 2015-05-21 18:46:20 +02:00
Björn Rabenstein c44e7cd105 Merge pull request #706 from prometheus/beorn7/persistence2
Improve iterator performance.
2015-05-21 13:48:52 +02:00
Fabian Reinartz 112a778922 Align int64s for atomic operations 2015-05-21 01:38:50 +02:00
beorn7 3b9c421a69 Weed out all the [Gg]et* method names.
The only exception is getNumChunksToPersist to avoid naming the struct
member numChunksToPersist in a weird way.
2015-05-20 19:13:06 +02:00
Julius Volz 267fd34156 Switch Prometheus to use github.com/prometheus/log.
This change is conceptually very simple, although the diff is large. It
switches logging from "github.com/golang/glog" to
"github.com/prometheus/log", while not actually changing any log
messages. V(1)-style logging has been changed to be log.Debug*().
2015-05-20 18:19:32 +02:00
beorn7 7c6466d476 Reserve only ~1M FPs for the mapping.
That reduces the chance of having a fingerprint in the reserved area.
2015-05-08 18:10:56 +02:00
beorn7 ac75dc2812 Avoid archive lookup for known mapped FPs. 2015-05-08 16:39:26 +02:00
beorn7 ed810b45bf Improvements after review. 2015-05-08 13:35:39 +02:00
beorn7 2235cec175 Handle fingerprint collisions. 2015-05-07 18:17:59 +02:00