The buffers we allocated were escaping to the heap, resulting in large
memory usage spikes during startup and checkpointing in Prometheus.
This attaches the buffer to the reader object to prevent this.
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>
