Changeset: cc4c2e909c01 for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB/rev/cc4c2e909c01
Modified Files:
gdk/gdk_storage.c
Branch: Mar2025
Log Message:
Don't truncate pre-exisiting heap files, but do truncate pre-existing text
files.
See comment in code.
diffs (19 lines):
diff --git a/gdk/gdk_storage.c b/gdk/gdk_storage.c
--- a/gdk/gdk_storage.c
+++ b/gdk/gdk_storage.c
@@ -231,7 +231,14 @@ GDKfdlocate(int farmid, const char *nme,
}
if (strchr(mode, 'w')) {
- flags |= O_WRONLY | O_CREAT | O_TRUNC;
+ flags |= O_WRONLY | O_CREAT;
+ /* HACK ALERT: text files also get truncated but binary
+ * files not! This is because mmap extend depends on
+ * files not getting truncated, and a second hot
+ * snapshot needs to completely overwrite a pre-existing
+ * (from an earlier snapshot) BBP.dir file. */
+ if (strchr(mode, 'b') == NULL)
+ flags |= O_TRUNC;
} else if (!strchr(mode, '+')) {
flags |= O_RDONLY;
} else {
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