closes https://github.com/prometheus/tsdb/issues/471
after implementing the new WAL this metric was missing so adding it again.
Also added it in a test to make sure it works as expected.
Signed-off-by: Krasi Georgiev <kgeorgie@redhat.com>
* repair wal when the record cannot be decoded
Currently repair is run only when the error happens in the reader.
A corruption can occur after the record is read and when it is decoded.
This change wraps the error at decoding as a CorruptionErr as this error
is expected to trigger a repair.
Signed-off-by: Krasi Georgiev <kgeorgie@redhat.com>
unexported NewMemTombstones as this returns unexported memTombstones
type which will not be shows in godoc.
Added missing comments for exported methods.
Removed unused RecordLogger,RecordReader interfaces.
Signed-off-by: Krasi Georgiev <kgeorgie@redhat.com>
fixes: https://github.com/prometheus/tsdb/issues/426
Using `filepath.Join()` instead of strings containing forward slash path delimiters (needed for non-*nix OSes), as suggested by @krasi-georgiev
This has been a frequent source of debugging pain since errors are
potentially delayed to a much later point. They bubble up in an
unrelated execution path.
We were determining a chunk's end time once it was one quarter full to
compute it so all chunks have uniform number of samples.
This accidentally skipped the case where series started near the end of
a chunk range/block and never reached that threshold. As a result they
got persisted but were continued across the range.
This resulted in corrupted persisted data.
This commit introduces error returns in various places and is explicit
about closing persisted blocks.
{Index,Chunk,Tombstone}Readers are more consistent about their Close()
method. Whenever a reader is retrieved, the corresponding close method
must eventually be called. We use this to track pending readers against
persisted blocks.
Querier's against the DB no longer hold a read lock for their entire
lifecycle. This avoids long running queriers to starve new ones when we
have to acquire a write lock when reloading blocks.
This adds various new locks to replace the single big lock on
the head. All parts now must be COW as they may be held by clients
after initial retrieval.
Series by ID and hashes are now held in a stripe lock to reduce
contention and total holding time during GC. This should reduce
starvation of readers.
This changes the structure to a single WAL backed by a single head
block.
Parts of the head block can be compacted. This relieves us from any head
amangement and greatly simplifies any consistency and isolation concerns
by just having a single head.
