Signed-off-by: NGoutham Veeramachaneni <cs14btech11014@iith.ac.in>

Signed-off-by: NGoutham Veeramachaneni <cs14btech11014@iith.ac.in>

Fixes #43

Added mint, maxt to chunkSeriesIterator. Adding a field there is
inevitable as something similar is required for ignoring deleted
time-ranges.
Signed-off-by: NGoutham Veeramachaneni <cs14btech11014@iith.ac.in>

Signed-off-by: NGoutham Veeramachaneni <cs14btech11014@iith.ac.in>

Signed-off-by: NGoutham Veeramachaneni <cs14btech11014@iith.ac.in>

A bad test was introduced a couple of commits ago which also made
changes to pass the bad test. Fixed the test and revert the changes.
Signed-off-by: NGoutham Veeramachaneni <cs14btech11014@iith.ac.in>

Signed-off-by: NGoutham Veeramachaneni <cs14btech11014@iith.ac.in>

* Renamed mergedPostings to make it consistent across the repo
* Fixed bug with Seek
* Added Tests for Seek
Signed-off-by: NGoutham Veeramachaneni <cs14btech11014@iith.ac.in>

This parallelizes commits to prevent deadlocks across inconsistently
locked heads. As commits are currently not fully atomic across
heads, this does decrease our guarantees.

Add mockIndex And Refactor Tests To Use That

Implement Postings Iterator Over Bytes

This adds a workaround to avoid deadlocks for inconsistent write lock
order across headBlocks.
Things keep working if transactions only append data for the same
timestamp, which is generally the case for Prometheus.

Full behavior should be restored in a subsequent change.

* To be more specific about the contents of the byte slice.

Add Sample Back

Closes fabxc/tsdb#18

The compilation and tests are broken as head.go requires sample which
has been moved to another package while moving BufferedSeriesIterator.

Duplication seemed better compared to exposing sample from tsdbutil.

This functionality is useful for a lot of clients but not relevant to
the TSDB's core features.

This functionality is useful for a lot of clients but not relevant to
the TSDB's core features.

This fixes a bug leaking memory because blocks were not actually closed
as the closing call references the initial, empty slice

GC is triggered rarely, which may cause unnecessarily high memory
spikes when running several compaction cycles in a row. Explicitly run
GC so we don't have idle bytes marked as used from the previous cycle.

Lint and Vet Fixes

Update kit/log To New API

This fixes different race condition encoutnered when running Prometheus.
It reduces the overall performance in the synthetic benchmark a fair bit
but has no indiciations of impacting a real-world setup notably.

This adds the Queryable interface to the Block interface. Head and
persisted blocks now implement their own Querier() method and thus
isolate customization (e.g. remapPostings) more cleanly.

This adds more lower-leve interfaces which are used to compose
to different Block interfaces.
The DB only uses interfaces instead of explicit persistedBlock and
headBlock. The headBlock generation property is dropped as the use-case
can be implemented using block sequence numbers.

NewContext has been removed couple of weeks back.
Ref: https://github.com/go-kit/kit/releases/tag/v0.4.0