Discovery and 65536 bytes JSON size limit.

[soulhunter]

Greetings,

I created a simple script for discovering DB objects, and it have been working just fine, until very recently, when I installed it on a server that has many DB objects: the discovered DB objects never showed up on Zabbix UI, and I saw nothing on the server's logs (nor agent's logs either), so, I tried to run zabbix_get :

zabbix_get -s SERVER_IP -k postgresql.tables.discovery

and I saw the output was truncated, so, I decided to see if it had a particular size:

zabbix_get -s SERVER_IP -k postgresql.tables.discovery|wc -c
65536

The total size should be 82065

So, I was wondering: is there a limit on the JSON answer size?

I found something similar, but for proxy, on bug ZBX-4780, but it says it was resolved.

Any ideas?

Sincerely,

Ildefonso Camargo

[soulhunter]

Sorry, forgot to add some info:

Server version: 2.0.3
Agent version: 2.0.3
DB: PostgreSQL
Arch: x86_64

[soulhunter]

This seems to be a bug. I created a bug report, ZBX-5863, I'll try to take a look myself, but I'm not familiar with Zabbix soruce, so, don't expect a quick and accurate answer from me today . Any help is welcome.

Ildefonso.

[Palmertree]

Try changing the MAX_BUFFER_LEN in zabbix/include/common.h to higher number like 1048576 and then recompile.

#define MAX_ID_LEN 21
#define MAX_STRING_LEN 2048
-#define MAX_BUFFER_LEN 65536
+#define MAX_BUFFER_LEN 1048576
#define MAX_ZBX_HOSTNAME_LEN 64

[soulhunter]

Try changing the MAX_BUFFER_LEN in zabbix/include/common.h to higher number like 1048576 and then recompile.

#define MAX_ID_LEN 21
#define MAX_STRING_LEN 2048
-#define MAX_BUFFER_LEN 65536
+#define MAX_BUFFER_LEN 1048576
#define MAX_ZBX_HOSTNAME_LEN 64

Right, this worked, but now I see this is an Agent issue, I tried first at server side: no dice, so, tried recompiling the agent: it worked!, so, I rolled-back server to the unpatched version: it still works, thus: server issue.

Thanks!