try random again

rabbitmq · Dec 17, 2024 · 0cbd28b · 0cbd28b
1 parent 53fad26
commit 0cbd28b
Showing 1 changed file with 9 additions and 0 deletions.
diff --git a/src/ra_log_segment.erl b/src/ra_log_segment.erl
@@ -116,6 +116,15 @@ open(Filename, Options) ->
 
 process_file(true, Mode, Filename, Fd, Options) ->
     AccessPattern = maps:get(access_pattern, Options, random),
+    if AccessPattern == random andalso
+       Mode == read ->
+           %% this is a guess using the defaults
+           Offs = maps:get(max_count, Options, ?SEGMENT_MAX_ENTRIES) * ?INDEX_RECORD_SIZE_V2,
+           _ = file:advise(Fd, Offs, 0, random),
+           ok;
+       true ->
+           ok
+    end,
     case read_header(Fd) of
         {ok, Version, MaxCount} ->
             MaxPending = maps:get(max_pending, Options, ?SEGMENT_MAX_PENDING),