Alexey Goncharuk created IGNITE-5938:
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Summary: Implement WAL logs compaction and compression after
checkpoint
Key: IGNITE-5938
URL: https://issues.apache.org/jira/browse/IGNITE-5938
Project: Ignite
Issue Type: Improvement
Components: persistence
Affects Versions: 2.1
Reporter: Alexey Goncharuk
Fix For: 2.2
Currently, we simply move WAL segments to archive when WAL segment is written
and delete when checkpoint history becomes too old.
Archived WAL segment contains physical delta records that are no longer needed
for rebalancing, so these records may be thrown away. In order to optimize disk
space and delta WAL rebalancing, we can do the following:
1) Clean the WAL segments from the physical records
2) Compress the cleaned segments (I expect this to be very effective since we
write full objects)
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