[GitHub] jiangphcn commented on a change in pull request #1186: [WIP] Clustered purge mixed cluster upgrade

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jiangphcn commented on a change in pull request #1186: [WIP] Clustered purge mixed cluster upgrade
URL: https://github.com/apache/couchdb/pull/1186#discussion_r171856181
 
 

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 File path: src/couch/src/couch_bt_engine.erl
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 @@ -759,6 +777,45 @@ set_default_security_object(Fd, Header, Compression, Options) ->
     end.
 
 
+% This function is to rollback pf clustered purge.
+% It replaces purge_tree_state and upurge_tree_state with
+% with purged_docs disk pointer that stores only the last purge request
+downgrade_purge_info(Fd, Header) ->
+    {db_header, _, UpSeq, _, IdTreeState, SeqTreeState, LocalTreeState, PSeq,
 
 Review comment:
   Re-formatted usage of db_header no matter whether downgrade_purge_info/2 will be used in pre-Clustered Purge build or not.

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