Create checkpoints from a sequence of WAL segments while filtering
out obsolete data. The checkpoint format is again a sequence of WAL
segments, which allows us to reuse the serialization format and
implementation.
Signed-off-by: Fabian Reinartz <freinartz@google.com>
Allow to repair the WAL based on the error returned by a reader
during a full scan over all records.
Signed-off-by: Fabian Reinartz <freinartz@google.com>
This adds a new WAL that's agnostic to the actual record contents.
It's much simpler and should be more resilient than the existing one.
Signed-off-by: Fabian Reinartz <freinartz@google.com>
Due to the way blocks used to overlap by 1 millisecond (see #347), when
requesting a 2-hour interval starting at `blocks[1].MinTime`, the
`Querier` would consider three blocks: `blocks[0]`, `blocks[1]` and
`blocks[2]`, because `blocks[0].MaxTime` and `blocks[2].MinTime` were in
that interval.
However, if the blocks don't overlap, only two blocks should be
returned: `blocks[1]` and `blocks[2]`. This test ensures that it's
indeed the case.
Signed-off-by: Benoît Knecht <benoit.knecht@fsfe.org>
Blocks are half-open intervals [a, b), while all other intervals
(chunks, head, ...) are closed intervals [a, b].
Make that distinction explicit by defining `OverlapsClosedInterval()`
methods for blocks and chunks, and using them in place of the more
generic `intervalOverlap()` function.
This change also fixes `db.Querier()` and `db.Delete()`, which could
previously return one extraneous block at the end of the specified
interval.
Signed-off-by: Benoît Knecht <benoit.knecht@fsfe.org>
Block intervals are bound by `block.MinTime`, `block.MaxTime`, but they
define a half-open interval: `[block.MinTime, block.MaxTime).
However, when deciding if a chunk was part of a block or not, the
`intervalOverlap()` function would consider both the chunk and the block
intervals as being closed.
Rather than modify the login in `intervalOverlap()`, we explicitly
remove the last value from the interval when reading from head to
persist blocks.
Signed-off-by: Benoît Knecht <benoit.knecht@fsfe.org>
Due to a regression blocks were no longer ordered by time before
being stored in memory. This made data intermittently become unavailable
for queries.
Signed-off-by: Fabian Reinartz <freinartz@google.com>
`validateBlockSequence` is not exported, make the letter case in the comment match the function name.
Signed-off-by: Matt Bostock <matt@mattbostock.com>
