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3 commits

Author SHA1 Message Date
Fabian Reinartz d951140ab8 wal: avoid heap allocation in WAL reader 
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>
 2018-07-19 07:25:30 -04:00
Fabian Reinartz 449a2d0db7 wal: add segment type and repair procedure 
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>
 2018-07-19 07:24:40 -04:00
Fabian Reinartz 8e1f97fad4 wal: add write ahead log package 
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>
 2018-07-19 07:24:40 -04:00