Commit graph

13 commits

Author SHA1 Message Date
Matt T. Proud 161c8fbf9b Include deletion processor for long-tail values.
This commit extracts the model.Values truncation behavior into the actual
tiered storage, which uses it and behaves in a peculiar way—notably the
retention of previous elements if the chunk were to ever go empty.  This is
done to enable interpolation between sparse sample values in the evaluation
cycle.  Nothing necessarily new here—just an extraction.

Now, the model.Values TruncateBefore functionality would do what a user
would expect without any surprises, which is required for the
DeletionProcessor, which may decide to split a large chunk in two if it
determines that the chunk contains the cut-off time.
2013-05-10 12:19:12 +02:00
Matt T. Proud b3e34c6658 Implement batch database sample curator.
This commit introduces to Prometheus a batch database sample curator,
which corroborates the high watermarks for sample series against the
curation watermark table to see whether a curator of a given type
needs to be run.

The curator is an abstract executor, which runs various curation
strategies across the database.  It remarks the progress for each
type of curation processor that runs for a given sample series.

A curation procesor is responsible for effectuating the underlying
batch changes that are request.  In this commit, we introduce the
CompactionProcessor, which takes several bits of runtime metadata and
combine sparse sample entries in the database together to form larger
groups.  For instance, for a given series it would be possible to
have the curator effectuate the following grouping:

- Samples Older than Two Weeks: Grouped into Bunches of 10000
- Samples Older than One Week: Grouped into Bunches of 1000
- Samples Older than One Day: Grouped into Bunches of 100
- Samples Older than One Hour: Grouped into Bunches of 10

The benefits hereof of such a compaction are 1. a smaller search
space in the database keyspace, 2. better employment of compression
for repetious values, and 3. reduced seek times.
2013-04-27 17:38:18 +02:00
Matt T. Proud 9e02c2393a Include generated Protocol Buffer descriptor.
The Protocol Buffer compiler supports generating a machine-readable
descriptor file encoded as a provided Protocol Buffer message type,
which can be used to decode messages that have been encoded with it
after-the-fact.  The generated descriptor also bundles in dependent
message types.

We can use this to perform forensics on old Prometheus clients, if
necessary.
2013-04-24 16:59:40 +02:00
Matt T. Proud f9e99bd08a Refresh SampleValue to 64-bit floating point.
We always knew that this needed to be fixed.
2013-04-21 20:31:50 +02:00
Julius Volz fd554e8b89 Make LevelDB sample keys fixed-length to ensure correct sort-order. 2013-04-11 18:17:44 +02:00
Matt T. Proud 3e97a3630d Include nascent curator scaffolding.
The curator doesn't do anything yet; rather, this is the type
definition including the anciliary testing scaffold.

Improve Makefile and Git developer experience.

The top-level Makefile was a bit overloaded in terms of generation of
assets and their management.  This has been offloaded into separate
Makefiles.

The Git developer experience sucked due to lack of .gitignore
policies.

Also: Fix faulty skiplist naming from old merge.
2013-03-25 19:38:14 +01:00
Matt T. Proud 1f7ed52b46 Start writing high watermarks. 2013-03-21 18:08:48 +01:00
Matt T. Proud f39b9c3c8e Checkpoint. 2013-03-21 18:06:51 +01:00
Matt T. Proud 41068c2e84 Checkpoint. 2013-03-21 18:06:51 +01:00
Julius Volz d67e4b9131 Address outstanding comments from PR/47 and other cleanups. 2013-02-07 11:38:01 +01:00
Matt T. Proud 15a6681651 Various cleanups.
Kill LevelDB watermarks due to redundancy.

General interface documentation has begun.

Creating custom types for the model to prevent errors down the
road.

Renaming of components for easier comprehension.

Exposition of interface in LevelDB.

Slew of simple refactorings.
2012-12-08 14:03:08 +01:00
Matt T. Proud 44f8802ae7 Add Apache License 2.0 boilerplate. 2012-11-26 20:11:34 +01:00
Matt T. Proud 6072143505 Initial commit of external resources. 2012-11-24 12:33:34 +01:00