nickva commented on PR #5619:
URL: https://github.com/apache/couchdb/pull/5619#issuecomment-3161881531
To notice the difference between main and PR can also try this trace pattern:
#### MAIN
`http $DB/db/_all_docs'?limit=0'`
=>
```
> recon_trace:calls({couch_file, pread_term, fun([_, _]) ->
message(caller_line()) end}, 1000).
1
19:4:44.127475 <0.5659.0> couch_file:pread_term(<0.1778.0>, 0)
{couch_bt_engine,get_header_term,3,{"src/couch_bt_engine.erl",1198}}
19:4:44.128057 <0.5659.0> couch_file:pread_term(<0.1778.0>, 0)
{couch_bt_engine,get_header_term,3,{"src/couch_bt_engine.erl",1198}}
19:4:44.128553 <0.5659.0> couch_file:pread_term(<0.1778.0>, 94860)
{couch_btree,get_node,2,{"src/couch_btree.erl",474}}
19:4:44.129022 <0.5659.0> couch_file:pread_term(<0.1778.0>, 49484)
{couch_btree,get_node,2,{"src/couch_btree.erl",474}}
```
`couch_btree:get_node/2` are expected but `get_header_terms` should be
cached...
#### WITH PR
```
> recon_trace:calls({couch_file, pread_term, fun([_, _]) ->
message(caller_line()) end}, 1000).
1
19:8:11.302801 <0.4886.0> couch_file:pread_term(<0.949.0>, 86369)
{couch_btree,get_node,2,{"src/couch_btree.erl",474}}
19:8:11.303378 <0.4886.0> couch_file:pread_term(<0.949.0>, 82175)
{couch_btree,get_node,2,{"src/couch_btree.erl",474}}
```
Just `couch_btree:get_node/2` calls, as expected.
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