Commit graph

15 commits

Author SHA1 Message Date
Matt T. Proud 30b1cf80b5 WIP - Snapshot of Moving to Client Model. 2013-06-25 15:52:42 +02:00
Matt T. Proud fe41ce0b19 Conditionalize disk initializations.
This commit conditionalizes the creation of the diskFrontier and
seriesFrontier along with the iterator such that they are provisioned
once something is actually required from disk.
2013-06-04 12:53:57 +02:00
Julius Volz 5b105c77fc Repointerize fingerprints. 2013-05-21 14:28:14 +02:00
Matt T. Proud 8f4c7ece92 Destroy naked returns in half of corpus.
The use of naked return values is frowned upon.  This is the first
of two bulk updates to remove them.
2013-05-16 10:53:25 +03:00
Matt T. Proud 4e0c932a4f Simplify Encoder's encoding signature.
The reality is that if we ever try to encode a Protocol Buffer and it
fails, it's likely that such an error is ultimately not a runtime error
and should be fixed forthwith.  Thusly, we should rename
``Encoder.Encode`` to ``Encoder.MustEncode`` and drop the error return
value.
2013-05-16 00:54:18 +03:00
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 db4ffbb262 Wrap dto.SampleKey with business logic type.
The curator work can be done easier if dto.SampleKey is no longer
directly accessed but rather has a higher level type around it that
captures a certain modicum of business logic.  This doesn't look
terribly interesting today, but it will get more so.
2013-04-21 20:38:39 +02:00
Matt T. Proud a55602df4a Validate diskFrontier domain for series candidate.
It is the case with the benchmark tool that we thought that we
generated multiple series and saved them to the disk as such, when
in reality, we overwrote the fields of the outgoing metrics via
Go map reference behavior.  This was accidental.  In the course of
diagnosing this, a few errors were found:

1. ``newSeriesFrontier`` should check to see if the candidate fingerprint is within the given domain of the ``diskFrontier``.  If not, as the contract in the docstring stipulates, a ``nil`` ``seriesFrontier`` should be emitted.

2. In the interests of aiding debugging, the raw LevelDB ``levigoIterator`` type now includes a helpful forensics ``String()`` method.

This work produced additional cleanups:

1. ``Close() error`` with the storage stack is technically incorrect, since nowhere in the bowels of it does an error actually occur.  The interface has been simplified to remove this for now.
2013-04-09 11:47:16 +02:00
Matt T. Proud c3e3460ca6 Spin up curator run in the tests.
After this commit, we'll need to add validations that it does the
desired work, which we presently know that it doesn't.  Given the
changes I made with a plethora of renamings, I want to commit this
now before it gets even larger.
2013-04-05 13:55:11 +02:00
Matt T. Proud b2e4c88b80 Wrap LevelDB iterator operations behind interface.
The LevelDB storage types return an interface type now that wraps
around the underlying iterator.  This both enhances testability but
improves upon, in my opinion, the interface design for the LevelDB
iterator.

Secondarily, the resource reaping behaviors for the LevelDB iterators
have been improved by dropping the externalized io.Closer object.

Finally, the iterator provisioning methods provide the option for
indicating whether one wants a snapshotted iterator or not.
2013-03-25 12:57:58 +01:00
Julius Volz bb9c5ed7aa Fix nil pointer exception in frontier building. 2013-03-21 18:08:48 +01:00
Julius Volz a224dda9f0 Fix diskFrontier.ContainsFingerprint() return value. 2013-03-21 18:08:48 +01:00
Julius Volz ce4f560e48 Encapsulate fingerprint frontier checks in renderView(). 2013-03-21 18:08:46 +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