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Code Issues Releases Wiki Activity

When we failover to a replica, log the exception we hit

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Summary: See PHI1180. Currently, when we failover to a replica, we may not log the failure. Failovers are serious business and bad news, so emit a log even if we are able to connect to the replica.

Test Plan:
Configured a bogus master and a good replica:

```
$ ./bin/mail list-outbound
[2019-03-29 16:26:09] PHLOG: 'Retrying (attempt 1) after connection failure ("AphrontConnectionQueryException", #2002): Attempt to connect to root@127.0.0.2 failed with error #2002: Operation timed out.' at [/Users/epriestley/dev/core/lib/libphutil/src/aphront/storage/connection/mysql/AphrontBaseMySQLDatabaseConnection.php:124]
[2019-03-29 16:26:19] PHLOG: 'Retrying (attempt 2) after connection failure ("AphrontConnectionQueryException", #2002): Attempt to connect to root@127.0.0.2 failed with error #2002: Operation timed out.' at [/Users/epriestley/dev/core/lib/libphutil/src/aphront/storage/connection/mysql/AphrontBaseMySQLDatabaseConnection.php:124]
[2019-03-29 16:26:29] EXCEPTION: (PhutilProxyException) Failed to connect to master database ("local_config"), failing over into read-only mode. {>} (AphrontConnectionQueryException) Attempt to connect to root@127.0.0.2 failed with error #2002: Operation timed out. at [<phutil>/src/aphront/storage/connection/mysql/AphrontBaseMySQLDatabaseConnection.php:362]
<...snip backtrace...>
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...
```

Configured a bogus master and a bogus replica:

```
$ ./bin/mail list-outbound
[2019-03-29 16:26:57] PHLOG: 'Retrying (attempt 1) after connection failure ("AphrontConnectionQueryException", #2002): Attempt to connect to root@127.0.0.2 failed with error #2002: Operation timed out.' at [/Users/epriestley/dev/core/lib/libphutil/src/aphront/storage/connection/mysql/AphrontBaseMySQLDatabaseConnection.php:124]
[2019-03-29 16:27:07] PHLOG: 'Retrying (attempt 2) after connection failure ("AphrontConnectionQueryException", #2002): Attempt to connect to root@127.0.0.2 failed with error #2002: Operation timed out.' at [/Users/epriestley/dev/core/lib/libphutil/src/aphront/storage/connection/mysql/AphrontBaseMySQLDatabaseConnection.php:124]
[2019-03-29 16:27:27] PHLOG: 'Retrying (attempt 1) after connection failure ("AphrontConnectionQueryException", #2002): Attempt to connect to root@127.0.0.3 failed with error #2002: Operation timed out.' at [/Users/epriestley/dev/core/lib/libphutil/src/aphront/storage/connection/mysql/AphrontBaseMySQLDatabaseConnection.php:124]
[2019-03-29 16:27:37] PHLOG: 'Retrying (attempt 2) after connection failure ("AphrontConnectionQueryException", #2002): Attempt to connect to root@127.0.0.3 failed with error #2002: Operation timed out.' at [/Users/epriestley/dev/core/lib/libphutil/src/aphront/storage/connection/mysql/AphrontBaseMySQLDatabaseConnection.php:124]
[2019-03-29 16:27:47] EXCEPTION: (PhabricatorClusterStrandedException) Unable to establish a connection to any database host (while trying "local_config"). All masters and replicas are completely unreachable.

AphrontConnectionQueryException: Attempt to connect to root@127.0.0.2 failed with error #2002: Operation timed out. at [<phabricator>/src/infrastructure/storage/lisk/PhabricatorLiskDAO.php:177]
<...snip backtrace...>
```

Reviewers: amckinley

Reviewed By: amckinley

Differential Revision: https://secure.phabricator.com/D20351
This commit is contained in:
epriestley 2019-03-29 16:23:56 -07:00
parent 02f94cd7d2
commit ea182b6df9
1 changed files with 13 additions and 0 deletions
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13
src/infrastructure/storage/lisk/PhabricatorLiskDAO.php
View file

@ -110,6 +110,19 @@ abstract class PhabricatorLiskDAO extends LiskDAO {
$connection = $replica->newApplicationConnection($database); $connection = $replica->newApplicationConnection($database);
$connection->setReadOnly(true); $connection->setReadOnly(true);
if ($replica->isReachable($connection)) { if ($replica->isReachable($connection)) {
if ($master_exception) {
// If we ended up here as the result of a failover, log the
// exception. This is seriously bad news even if we are able
// to recover from it.
$proxy_exception = new PhutilProxyException(
pht(
'Failed to connect to master database ("%s"), failing over '.
'into read-only mode.',
$database),
$master_exception);
phlog($proxy_exception);
}
return $connection; return $connection;
} }
} }