Changeset: e89e369f5dfb for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=e89e369f5dfb
Modified Files:
sql/storage/bat/bat_logger.c
Branch: hot-snapshot
Log Message:
Plan to snapshot part of the WAL log
diffs (48 lines):
diff --git a/sql/storage/bat/bat_logger.c b/sql/storage/bat/bat_logger.c
--- a/sql/storage/bat/bat_logger.c
+++ b/sql/storage/bat/bat_logger.c
@@ -342,10 +342,43 @@ bl_reload_shared(void)
return logger_reload(bat_logger_shared) == GDK_SUCCEED ? LOG_OK :
LOG_ERR;
}
+static const char*
+snapshot_wal(stream *plan)
+{
+ stream *log = bat_logger->log;
+ char *log_file = mnstr_name(log);
+ long pos = ftell(getFile(log));
+ if (pos < 0)
+ return strerror(errno);
+
+ /* ASSUMPTION: the logger does not seek around in the logfile so
+ * everything after pos is currently garbage and irrelevant to this
+ * snapshot.
+ */
+ mnstr_printf(plan, "%ld %s\n", pos, log_file);
+ return NULL;
+}
+
+static const char*
+snapshot_bbp(stream *plan)
+{
+ /* to be implemented */
+ (void) plan;
+ return NULL;
+}
+
static const char*
bl_snapshot(stream *plan)
{
- mnstr_printf(plan, "Here's the plan: make a snapshot!\n");
+ const char *err;
+
+ err = snapshot_wal(plan);
+ if (err)
+ return err;
+ err = snapshot_bbp(plan);
+ if (err)
+ return err;
+
return NULL;
}
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