Andrey Gura created IGNITE-9903:
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Summary: Copy only actual amount of data during archiving of WAL
segment
Key: IGNITE-9903
URL: https://issues.apache.org/jira/browse/IGNITE-9903
Project: Ignite
Issue Type: Improvement
Reporter: Andrey Gura
Assignee: Andrey Gura
Fix For: 2.8
Current WAL archiver implementation copies full WAL segment to the archive
while actual size of the segment can be significantly less then
{{maxWalSegmentSize}} (segment files are preallocated for max possible segment
size).
In order to reduce disk space consuming we need copy only actual data of
segment using {{SWITCH_SEGMENT_RECORD}} as marker. It will require some kind of
WAL iterator implementation that will just copy WAL records using information
about record size without records deserialization.
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