(couchdb) 14/38: Use local pids for cfile

[va...@apache.org]

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vatamane pushed a commit to branch merge-3.4.3
in repository https://gitbox.apache.org/repos/asf/couchdb.git

commit ee057f22f4cc51c34fa4174cf89503e0230d05a9
Author: Nick Vatamaniuc <va...@gmail.com>
AuthorDate: Tue Mar 4 10:42:12 2025 -0500

    Use local pids for cfile
    
    Pids could be remote when processing attachments and `is_process_alive/1` will
    throw an error then, so ensure a fallback for non-local processes.
---
 src/couch/src/couch_file.erl | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/couch/src/couch_file.erl b/src/couch/src/couch_file.erl
index 8f15bd8cd..78189c64e 100644
--- a/src/couch/src/couch_file.erl
+++ b/src/couch/src/couch_file.erl
@@ -941,7 +941,10 @@ generate_xxhash_checksums() ->
 %
 
 get_cfile(Pid) when is_pid(Pid) ->
-    case {is_process_alive(Pid), get(?CFILE_HANDLE)} of
+    % Pids could be remote when processing attachments and is_process_alive/1
+    % will throw an error then, so ensure a fallback for non-local processes
+    PidAliveAndLocal = node(Pid) =:= node() andalso is_process_alive(Pid),
+    case {PidAliveAndLocal, get(?CFILE_HANDLE)} of
         {false, _} ->
             erase(?CFILE_HANDLE),
             undefined;