Commit Graph

12 Commits (0e42449b78140a38b2d4e7c65a3238136b658557)

Author SHA1 Message Date
Tom Wilkie 67da8e7b46
Refactor and fix queue resharding (#5286)
- Remove prometheus_remote_queue_last_send_timestamp_seconds metric.  Its not particularly useful, we have highest_timestamp_seconds.
- Factor out maxGauage, a gauge that only increases.
- Change sharding calculations to use max samples in timestamp - max samples out timestamp (not rates).
- Also include the ratio of samples dropped to correctly predict number of pending samples.

Signed-off-by: Tom Wilkie <tom.wilkie@gmail.com>
2019-03-01 11:04:26 -08:00
Tom Wilkie 37ad4db485 Export timestamps in seconds since epoch.
Signed-off-by: Tom Wilkie <tom.wilkie@gmail.com>
2019-02-28 08:38:39 -08:00
Tom Wilkie b93bafeee1 Various fixes to locking & shutdown for WAL-based remote write.
- Remove datarace in the exported highest scrape timestamp.
- Backoff on enqueue should be per-sample - reset the result for each sample.
- Remove diffKeys, unused ctx and cancelfunc in WALWatcher, 'name' from writeTo interface, and pass it to constructor.
- Reorder functions in WALWatcher depth-first according to call graph.
- Fix vendor/modules.txt.
- Split out the various timer periods into consts at the top of the file.
- Move w.currentSegmentMetric.Set close to where we set the currentSegment.
- Combine r.Next() and isClosed(w.quit) into a single loop.
- Unnest some ifs in WALWatcher.watch, propagate erros in decodeRecord, add some new lines to make it easier to read.
- Reorganise checkpoint handling to reduce nesting and make it easier to follow.

Signed-off-by: Tom Wilkie <tom.wilkie@gmail.com>
2019-02-12 11:39:13 +00:00
Callum Styan 6f69e31398 Tail the TSDB WAL for remote_write
This change switches the remote_write API to use the TSDB WAL.  This should reduce memory usage and prevent sample loss when the remote end point is down.

We use the new LiveReader from TSDB to tail WAL segments.  Logic for finding the tracking segment is included in this PR.  The WAL is tailed once for each remote_write endpoint specified. Reading from the segment is based on a ticker rather than relying on fsnotify write events, which were found to be complicated and unreliable in early prototypes.

Enqueuing a sample for sending via remote_write can now block, to provide back pressure.  Queues are still required to acheive parallelism and batching.  We have updated the queue config based on new defaults for queue capacity and pending samples values - much smaller values are now possible.  The remote_write resharding code has been updated to prevent deadlocks, and extra tests have been added for these cases.

As part of this change, we attempt to guarantee that samples are not lost; however this initial version doesn't guarantee this across Prometheus restarts or non-retryable errors from the remote end (eg 400s).

This changes also includes the following optimisations:
- only marshal the proto request once, not once per retry
- maintain a single copy of the labels for given series to reduce GC pressure

Other minor tweaks:
- only reshard if we've also successfully sent recently
- add pending samples, latest sent timestamp, WAL events processed metrics

Co-authored-by: Chris Marchbanks <csmarchbanks.com> (initial prototype)
Co-authored-by: Tom Wilkie <tom.wilkie@gmail.com> (sharding changes)
Signed-off-by: Callum Styan <callumstyan@gmail.com>
2019-02-12 11:39:13 +00:00
Julius Volz 8fbe1b5133
Handle a bunch of unchecked errors (#4461)
There are many more (mostly finalizers like Close/Stop/etc.), but most of
the others seemed like one couldn't do much about them anyway.

Signed-off-by: Julius Volz <julius.volz@gmail.com>
2018-08-17 17:24:35 +02:00
Krasi Georgiev b75428ec19 rename package retrieve to scrape
no fucnctinal changes just renaming retrieval to scrape
2018-02-01 09:55:07 +00:00
Tom Wilkie e8c264e47a Add comment. 2017-10-26 11:09:16 +01:00
Tom Wilkie 56820726fa Move a couple of the encoding/decoding functions into codec.go 2017-10-26 11:08:33 +01:00
Julius Volz c3d6abc8e6 Fix some lint errors (#3334)
I left the promql ones and some others untouched as I remember that @fabxc
prefers them that way.
2017-10-23 14:57:30 +01:00
Fabian Reinartz 0efecea6d4 Adapt storage APIs to uint64 references 2017-09-07 14:14:41 +02:00
Tom Wilkie db8128ceeb Add label set as first parameter to AddFast, ingored by TSDB adapter. 2017-07-12 15:20:12 +01:00
Tom Wilkie 2dda5775e3 Initial port of remote storage to v2. 2017-07-12 12:27:57 +01:00