[RATIS-1626] Add conf param for purge log - ASF JIRA

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Details

Type: Improvement
Status: Resolved
Priority: Major
Resolution: Fixed
Affects Version/s: None
Fix Version/s: 2.4.0, 3.0.0
Component/s: conf, server
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None

Description

Add a new conf to control latest n won’t-be-purged logs. It can help applications to balance between the cost of preserving & transferring lagging logs and the cost of transferring snapshot. Intuitively, applications can set n to where (n average logs == a snapshot).