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Issue with aborted MySQL connections (error code: 4)
Long connection times from PHP to MySQL on EC2Will MySQL refuse any new connections after it has reached the max connections till it's restarted?MySQL : limit the number of clients served concurrentlyMySQL too many connectionsHow can I limit the maximum number of simultaneous MediaWiki to MySQL database connections?My SQL error:too many connectionsRandom “Lost connection to MySQL server at 'reading initial communication packet', system error: 0”MySQL too many connections during normal conditions (Percona, InnoDB)ubuntu mysql too many connectionsAWS ELB Latency issuemysql - scripts report “Too many connections” error, number of connections is < 50
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Some of the connections between my application server (Ubuntu, Apache, PHP) and my DB server (Ubuntu, MySQL) are failing with error code 4. According to the documentation error code 4 is:
OS error code 4: Interrupted system call
At first I thought that maybe the issue is that the DB server has too many connections and fails because there are too much open files. But it seems not to be the case because:
- Too many open files has different error code (24).
- I've checked and during peak time the server had 497 files open (checked using lsof command) while the maximum is 1024.
The TCP settings were already checked (see prior question).
Any ideas what this can be or what should I check?
apache-2.2 ubuntu mysql php amazon-ec2
edited Apr 13 '17 at 12:14
Community♦
1
asked May 5 '10 at 13:00
arikfrarikfr
224415
add a comment |
Some of the connections between my application server (Ubuntu, Apache, PHP) and my DB server (Ubuntu, MySQL) are failing with error code 4. According to the documentation error code 4 is:
OS error code 4: Interrupted system call
At first I thought that maybe the issue is that the DB server has too many connections and fails because there are too much open files. But it seems not to be the case because:
- Too many open files has different error code (24).
- I've checked and during peak time the server had 497 files open (checked using lsof command) while the maximum is 1024.
The TCP settings were already checked (see prior question).
Any ideas what this can be or what should I check?
apache-2.2 ubuntu mysql php amazon-ec2
edited Apr 13 '17 at 12:14
Community♦
1
asked May 5 '10 at 13:00
arikfrarikfr
224415
add a comment |
Some of the connections between my application server (Ubuntu, Apache, PHP) and my DB server (Ubuntu, MySQL) are failing with error code 4. According to the documentation error code 4 is:
OS error code 4: Interrupted system call
At first I thought that maybe the issue is that the DB server has too many connections and fails because there are too much open files. But it seems not to be the case because:
- Too many open files has different error code (24).
- I've checked and during peak time the server had 497 files open (checked using lsof command) while the maximum is 1024.
The TCP settings were already checked (see prior question).
Any ideas what this can be or what should I check?
apache-2.2 ubuntu mysql php amazon-ec2
edited Apr 13 '17 at 12:14
Community♦
1
asked May 5 '10 at 13:00
arikfrarikfr
224415
Some of the connections between my application server (Ubuntu, Apache, PHP) and my DB server (Ubuntu, MySQL) are failing with error code 4. According to the documentation error code 4 is:
OS error code 4: Interrupted system call
At first I thought that maybe the issue is that the DB server has too many connections and fails because there are too much open files. But it seems not to be the case because:
- Too many open files has different error code (24).
- I've checked and during peak time the server had 497 files open (checked using lsof command) while the maximum is 1024.
The TCP settings were already checked (see prior question).
Any ideas what this can be or what should I check?
apache-2.2 ubuntu mysql php amazon-ec2
apache-2.2 ubuntu mysql php amazon-ec2
edited Apr 13 '17 at 12:14
Community♦
1
asked May 5 '10 at 13:00
arikfrarikfr
224415
edited Apr 13 '17 at 12:14
Community♦
1
asked May 5 '10 at 13:00
arikfrarikfr
224415
edited Apr 13 '17 at 12:14
Community♦
1
edited Apr 13 '17 at 12:14
Community♦
1
edited Apr 13 '17 at 12:14
Community♦
1
1
asked May 5 '10 at 13:00
arikfrarikfr
224415
asked May 5 '10 at 13:00
arikfrarikfr
224415
asked May 5 '10 at 13:00
arikfrarikfr
224415
224415
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Check your ifconfig stats, it could be a packet drop or something like that, I already seen it.
answered May 5 '10 at 14:11
user42198user42198
491
> RX packets:250356058 errors:0 dropped:0 overruns:0 frame:0 > TX packets:195826222 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:1000 Here's the results from one of the DB servers. Similar results on the application servers. Any other ideas?
– arikfr
May 5 '10 at 14:53
add a comment |
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1 Answer
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1 Answer
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Check your ifconfig stats, it could be a packet drop or something like that, I already seen it.
answered May 5 '10 at 14:11
user42198user42198
491
> RX packets:250356058 errors:0 dropped:0 overruns:0 frame:0 > TX packets:195826222 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:1000 Here's the results from one of the DB servers. Similar results on the application servers. Any other ideas?
– arikfr
May 5 '10 at 14:53
add a comment |
Check your ifconfig stats, it could be a packet drop or something like that, I already seen it.
answered May 5 '10 at 14:11
user42198user42198
491
> RX packets:250356058 errors:0 dropped:0 overruns:0 frame:0 > TX packets:195826222 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:1000 Here's the results from one of the DB servers. Similar results on the application servers. Any other ideas?
– arikfr
May 5 '10 at 14:53
add a comment |
Check your ifconfig stats, it could be a packet drop or something like that, I already seen it.
answered May 5 '10 at 14:11
user42198user42198
491
Check your ifconfig stats, it could be a packet drop or something like that, I already seen it.
answered May 5 '10 at 14:11
user42198user42198
491
answered May 5 '10 at 14:11
user42198user42198
491
answered May 5 '10 at 14:11
user42198user42198
491
answered May 5 '10 at 14:11
user42198user42198
491
491
> RX packets:250356058 errors:0 dropped:0 overruns:0 frame:0 > TX packets:195826222 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:1000 Here's the results from one of the DB servers. Similar results on the application servers. Any other ideas?
– arikfr
May 5 '10 at 14:53
add a comment |
> RX packets:250356058 errors:0 dropped:0 overruns:0 frame:0 > TX packets:195826222 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:1000 Here's the results from one of the DB servers. Similar results on the application servers. Any other ideas?
– arikfr
May 5 '10 at 14:53
> RX packets:250356058 errors:0 dropped:0 overruns:0 frame:0 > TX packets:195826222 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:1000 Here's the results from one of the DB servers. Similar results on the application servers. Any other ideas?
– arikfr
May 5 '10 at 14:53
> RX packets:250356058 errors:0 dropped:0 overruns:0 frame:0 > TX packets:195826222 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:1000 Here's the results from one of the DB servers. Similar results on the application servers. Any other ideas?
– arikfr
May 5 '10 at 14:53
add a comment |
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