DNS_ERROR would cause the replica to not be marked as unusable, resulting in the replica being repeatedly reattempted on subsequent queries and for connection failover to break.
(This is common in Kubernetes setups where a replica has failed and it's DNS record is returning NXDOMAIN)
On SELECT, would additionally result in an intermittent query error if the failed replica is chosen:
"Code: 198. DB::Exception: Received from localhost:9000. DB::Exception: Not found address of host: chi-clickhouse-main-2-0: While executing Remote. (DNS_ERROR)"
Here is oneliner:
$ gg 'LOG_\(DEBUG\|TRACE\|INFO\|TEST\|WARNING\|ERROR\|FATAL\)([^,]*, [a-zA-Z]' -- :*.cpp :*.h | cut -d: -f1 | sort -u | xargs -r sed -E -i 's#(LOG_[A-Z]*)\(([^,]*), ([A-Za-z][^,)]*)#\1(\2, fmt::runtime(\3)#'
Note, that I tried to do this with coccinelle (tool for semantic
patchin), but it cannot parse C++:
$ cat fmt.cocci
@@
expression log;
expression var;
@@
-LOG_DEBUG(log, var)
+LOG_DEBUG(log, fmt::runtime(var))
I've also tried to use some macros/templates magic to do this implicitly
in logger_useful.h, but I failed to do so, and apparently it is not
possible for now.
Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com>
v2: manual fixes
Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com>
