Sfrgttk

Is it true that real estate prices mainly go up?

How does Dispel Magic work against Stoneskin?

Touchscreen-controlled dentist office snowman collector game

What Happens when Passenger Refuses to Fly Boeing 737 Max?

When were linguistics departments first established

Is going from continuous data to categorical always wrong?

What exactly is the purpose of connection links straped between the rocket and the launch pad

How could a female member of a species produce eggs unto death?

Time dilation for a moving electronic clock

Playing ONE triplet (not three)

Can infringement of a trademark be pursued for using a company's name in a sentence?

Can you reject a postdoc offer after the PI has paid a large sum for flights/accommodation for your visit?

Force user to remove USB token

Why don't MCU characters ever seem to have language issues?

Provisioning profile doesn't include the application-identifier and keychain-access-groups entitlements

Is having access to past exams cheating and, if yes, could it be proven just by a good grade?

Should we release the security issues we found in our product as CVE or we can just update those on weekly release notes?

Good allowance savings plan?

Is it ok to include an epilogue dedicated to colleagues who passed away in the end of the manuscript?

Can "semicircle" be used to refer to a part-circle that is not a exact half-circle?

Should QA ask requirements to developers?

Counter-example to the existence of left Bousfield localization of combinatorial model category

"One can do his homework in the library"

What does おとこえしや mean?

Is it possible for unique key to break master-master replication in mysql?

Unexplained InnoDB timeoutsAre two indexes needed?Finding rows for a specified date rangeAdding index to large mysql tablesOptimizing a simple query on a large tableNeed help improving sql query performanceHow to improve query count execution with mySql replicate?MySQL query taking too longINSERT gives Error Code: 1366. Incorrect string value: 'xF0x9Fx98x80' for column

2

I have a master-master mysql setup with 2 servers running the exact same application making writes to such a table:

 CREATE TABLE `metric` (

  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,

  `host` varchar(50) NOT NULL,

  `userid` int(10) unsigned DEFAULT NULL,

  `name` varchar(255) NOT NULL,

  `sampleid` tinyint(3) unsigned NOT NULL,

  PRIMARY KEY (`id`),

  UNIQUE KEY `unique-metric` (`userid`,`host`,`name`,`sampleid`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8

auto_increment_increment is 2 and offsets are 0 and 1, so PK ids don't clash, but is it possible that with bad timing, 2 applications will create a row with an equal unique-metric index breaking replication on both mysql servers, since replication thread won't be able to insert replicated row into table due to another row already having the exact same index?

mysql replication

share|improve this question

asked Apr 8 '14 at 10:59

FluffyFluffy

1113

bumped to the homepage by Community♦ 2 mins ago

This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

add a comment | 

2

I have a master-master mysql setup with 2 servers running the exact same application making writes to such a table:

 CREATE TABLE `metric` (

  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,

  `host` varchar(50) NOT NULL,

  `userid` int(10) unsigned DEFAULT NULL,

  `name` varchar(255) NOT NULL,

  `sampleid` tinyint(3) unsigned NOT NULL,

  PRIMARY KEY (`id`),

  UNIQUE KEY `unique-metric` (`userid`,`host`,`name`,`sampleid`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8

auto_increment_increment is 2 and offsets are 0 and 1, so PK ids don't clash, but is it possible that with bad timing, 2 applications will create a row with an equal unique-metric index breaking replication on both mysql servers, since replication thread won't be able to insert replicated row into table due to another row already having the exact same index?

mysql replication

share|improve this question

asked Apr 8 '14 at 10:59

FluffyFluffy

1113

bumped to the homepage by Community♦ 2 mins ago

This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

add a comment | 

I have a master-master mysql setup with 2 servers running the exact same application making writes to such a table:

 CREATE TABLE `metric` (

  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,

  `host` varchar(50) NOT NULL,

  `userid` int(10) unsigned DEFAULT NULL,

  `name` varchar(255) NOT NULL,

  `sampleid` tinyint(3) unsigned NOT NULL,

  PRIMARY KEY (`id`),

  UNIQUE KEY `unique-metric` (`userid`,`host`,`name`,`sampleid`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8

auto_increment_increment is 2 and offsets are 0 and 1, so PK ids don't clash, but is it possible that with bad timing, 2 applications will create a row with an equal unique-metric index breaking replication on both mysql servers, since replication thread won't be able to insert replicated row into table due to another row already having the exact same index?

mysql replication

share|improve this question

asked Apr 8 '14 at 10:59

FluffyFluffy

1113

 CREATE TABLE `metric` (

  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,

  `host` varchar(50) NOT NULL,

  `userid` int(10) unsigned DEFAULT NULL,

  `name` varchar(255) NOT NULL,

  `sampleid` tinyint(3) unsigned NOT NULL,

  PRIMARY KEY (`id`),

  UNIQUE KEY `unique-metric` (`userid`,`host`,`name`,`sampleid`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8

share|improve this question

asked Apr 8 '14 at 10:59

FluffyFluffy

1113

share|improve this question

asked Apr 8 '14 at 10:59

FluffyFluffy

1113

asked Apr 8 '14 at 10:59

FluffyFluffy

1113

asked Apr 8 '14 at 10:59

FluffyFluffy

1113

1 Answer
1

active

oldest

votes

0

Though I've not tried this myself, I've done a quick documentation hunt and found that this part of the MySQL documentation is helpful.

The relevant part is:

If a statement produces different errors on the master and the slave, the slave SQL thread terminates, and the slave writes a message to its error log and waits for the database administrator to decide what to do about the error. This includes the case that a statement produces an error on the master or the slave, but not both.

The next question would then be: "How do I know there has been an error?", to which I've found a useful script here, which could be run frequently as a cron task.

share|improve this answer

answered Jan 22 '18 at 10:16

NealeUNealeU

1011

add a comment | 

Your Answer

StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "182"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});


}
});

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Sign up using Google

Sign up using Facebook

Sign up using Email and Password

Post as a guest

Name

Email

Required, but never shown

StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fdba.stackexchange.com%2fquestions%2f62747%2fis-it-possible-for-unique-key-to-break-master-master-replication-in-mysql%23new-answer', 'question_page');
}
);

Post as a guest

Name

Email

Required, but never shown

0

Though I've not tried this myself, I've done a quick documentation hunt and found that this part of the MySQL documentation is helpful.

The relevant part is:

If a statement produces different errors on the master and the slave, the slave SQL thread terminates, and the slave writes a message to its error log and waits for the database administrator to decide what to do about the error. This includes the case that a statement produces an error on the master or the slave, but not both.

The next question would then be: "How do I know there has been an error?", to which I've found a useful script here, which could be run frequently as a cron task.

share|improve this answer

answered Jan 22 '18 at 10:16

NealeUNealeU

1011

add a comment | 

0

Though I've not tried this myself, I've done a quick documentation hunt and found that this part of the MySQL documentation is helpful.

The relevant part is:

If a statement produces different errors on the master and the slave, the slave SQL thread terminates, and the slave writes a message to its error log and waits for the database administrator to decide what to do about the error. This includes the case that a statement produces an error on the master or the slave, but not both.

The next question would then be: "How do I know there has been an error?", to which I've found a useful script here, which could be run frequently as a cron task.

share|improve this answer

answered Jan 22 '18 at 10:16

NealeUNealeU

1011

add a comment | 

Though I've not tried this myself, I've done a quick documentation hunt and found that this part of the MySQL documentation is helpful.

The relevant part is:

If a statement produces different errors on the master and the slave, the slave SQL thread terminates, and the slave writes a message to its error log and waits for the database administrator to decide what to do about the error. This includes the case that a statement produces an error on the master or the slave, but not both.

The next question would then be: "How do I know there has been an error?", to which I've found a useful script here, which could be run frequently as a cron task.

share|improve this answer

answered Jan 22 '18 at 10:16

NealeUNealeU

1011

share|improve this answer

answered Jan 22 '18 at 10:16

NealeUNealeU

1011

answered Jan 22 '18 at 10:16

NealeUNealeU

1011

answered Jan 22 '18 at 10:16

NealeUNealeU

1011