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D16876.id40689.diff
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diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -2465,6 +2465,7 @@
'PhabricatorDataNotAttachedException' => 'infrastructure/storage/lisk/PhabricatorDataNotAttachedException.php',
'PhabricatorDatabaseHealthRecord' => 'infrastructure/cluster/PhabricatorDatabaseHealthRecord.php',
'PhabricatorDatabaseRef' => 'infrastructure/cluster/PhabricatorDatabaseRef.php',
+ 'PhabricatorDatabaseRefParser' => 'infrastructure/cluster/PhabricatorDatabaseRefParser.php',
'PhabricatorDatabaseSetupCheck' => 'applications/config/check/PhabricatorDatabaseSetupCheck.php',
'PhabricatorDatasourceEditField' => 'applications/transactions/editfield/PhabricatorDatasourceEditField.php',
'PhabricatorDatasourceEditType' => 'applications/transactions/edittype/PhabricatorDatasourceEditType.php',
@@ -7399,6 +7400,7 @@
'PhabricatorDataNotAttachedException' => 'Exception',
'PhabricatorDatabaseHealthRecord' => 'Phobject',
'PhabricatorDatabaseRef' => 'Phobject',
+ 'PhabricatorDatabaseRefParser' => 'Phobject',
'PhabricatorDatabaseSetupCheck' => 'PhabricatorSetupCheck',
'PhabricatorDatasourceEditField' => 'PhabricatorTokenizerEditField',
'PhabricatorDatasourceEditType' => 'PhabricatorPHIDListEditType',
diff --git a/src/applications/config/controller/PhabricatorConfigClusterDatabasesController.php b/src/applications/config/controller/PhabricatorConfigClusterDatabasesController.php
--- a/src/applications/config/controller/PhabricatorConfigClusterDatabasesController.php
+++ b/src/applications/config/controller/PhabricatorConfigClusterDatabasesController.php
@@ -169,8 +169,37 @@
$messages = phutil_implode_html(phutil_tag('br'), $messages);
+ $partition = null;
+ if ($database->getIsMaster()) {
+ if ($database->getIsDefaultPartition()) {
+ $partition = id(new PHUIIconView())
+ ->setIcon('fa-circle sky')
+ ->addSigil('has-tooltip')
+ ->setMetadata(
+ array(
+ 'tip' => pht('Default Partition'),
+ ));
+ } else {
+ $map = $database->getApplicationMap();
+ if ($map) {
+ $list = implode(', ', $map);
+ } else {
+ $list = pht('Empty');
+ }
+
+ $partition = id(new PHUIIconView())
+ ->setIcon('fa-adjust sky')
+ ->addSigil('has-tooltip')
+ ->setMetadata(
+ array(
+ 'tip' => pht('Partition: %s', $list),
+ ));
+ }
+ }
+
$rows[] = array(
$role_icon,
+ $partition,
$database->getHost(),
$database->getPort(),
$database->getUser(),
@@ -188,6 +217,7 @@
->setHeaders(
array(
null,
+ null,
pht('Host'),
pht('Port'),
pht('User'),
@@ -205,6 +235,7 @@
null,
null,
null,
+ null,
'wide',
));
diff --git a/src/docs/user/cluster/cluster_databases.diviner b/src/docs/user/cluster/cluster_databases.diviner
--- a/src/docs/user/cluster/cluster_databases.diviner
+++ b/src/docs/user/cluster/cluster_databases.diviner
@@ -29,6 +29,12 @@
There are no current plans to support multi-master mode or autonomous failover,
although this may change in the future.
+Phabricator applications //can// be partitioned across multiple database
+masters. This does not provide redundancy and generally does not increase
+resiliance or resistance to data loss, but can help you scale and operate
+Phabricator. For details, see
+@{article:Cluster: Partitioning and Advanced Configuration}.
+
Setting up MySQL Replication
============================
diff --git a/src/docs/user/cluster/cluster_partitioning.diviner b/src/docs/user/cluster/cluster_partitioning.diviner
new file mode 100644
--- /dev/null
+++ b/src/docs/user/cluster/cluster_partitioning.diviner
@@ -0,0 +1,187 @@
+@title Cluster: Partitioning and Advanced Configuration
+@group cluster
+
+Guide to partitioning Phabricator applications across multiple database hosts.
+
+Overview
+========
+
+WARNING: Partitioning is a prototype.
+
+You can partition Phabricator's applications across multiple databases. For
+example, you can move an application like Files or Maniphest to a dedicated
+database host.
+
+The advantages of doing this are:
+
+ - moving heavily used applications to dedicated hardware can help you
+ scale; and
+ - you can match application workloads to hardware or configuration to make
+ operating the cluster easier.
+
+This configuration is complex, and very few installs need to pursue it.
+Phabricator will normally run comfortably with a single database master even
+for large organizations.
+
+Partitioning generally does not do much to increase resiliance or make it
+easier to recover from disasters, and is primarily a mechanism for scaling.
+
+If you are considering partitioning, you likely want to configure replication
+with a single master first. Even if you choose not to deploy replication, you
+should review and understand how replication works before you partition. For
+details, see @{Cluster:Databases}.
+
+
+What Partitioning Does
+======================
+
+When you partition Phabricator, you move all of the data for one or more
+applications (like Maniphest) to a new master database host. This is possible
+because Phabricator stores data for each application in its own logical
+database (like `phabricator_maniphest`) and performs no joins between databases.
+
+If you're running into scale limits on a single master database, you can move
+one or more of your most commonly-used applications to a second database host
+and continue adding users. You can keep partitioning applications until all
+heavily used applications have dedicated database servers.
+
+Alternatively or additionally, you can partition applications to make operating
+the cluster easier. Some applications have unusual workloads or requirements,
+and moving them to separate hosts may make things easier to deal with overall.
+
+For example: if Files accounts for most of the data on your install, you might
+move it to a different host to make backing up everything else easier.
+
+
+Configuration Overview
+======================
+
+To configure partitioning, you will add multiple entries to `cluster.databases`
+with the `master` role. Each `master` should specify a new `partition` key,
+which contains a list of application databases it should host.
+
+One master may be specified as the `default` partition. Applications not
+explicitly configured to be assigned elsewhere will be assigned here.
+
+When you define multiple `master` databases, you must also specify which master
+each `replica` database follows. Here's a simple example config:
+
+```lang=json
+...
+"cluster.databases": [
+ {
+ "host": "db001.corporation.com",
+ "role": "master",
+ "user": "phabricator",
+ "pass": "hunter2!trustno1",
+ "port": 3306,
+ "partition": [
+ "default"
+ ]
+ },
+ {
+ "host": "db002.corporation.com",
+ "role": "replica",
+ "user": "phabricator",
+ "pass": "hunter2!trustno1",
+ "port": 3306,
+ "master": "db001.corporation.com:3306"
+ },
+ {
+ "host": "db003.corporation.com",
+ "role": "master",
+ "user": "phabricator",
+ "pass": "hunter2!trustno1",
+ "port": 3306,
+ "partition": [
+ "file",
+ "passphrase",
+ "slowvote"
+ ]
+ },
+ {
+ "host": "db004.corporation.com",
+ "role": "replica",
+ "user": "phabricator",
+ "pass": "hunter2!trustno1",
+ "port": 3306,
+ "master": "db003.corporation.com:3306"
+ }
+],
+...
+```
+
+In this configuration, `db001` is a master and `db002` replicates it.
+`db003` is a second master, replicated by `db004`.
+
+Applications have been partitioned like this:
+
+ - `db003`/`db004`: Files, Passphrase, Slowvote
+ - `db001`/`db002`: Default (all other applications)
+
+Not all of the database partition names are the same as the application
+names. You can get a list of databases with `bin/storage databases` to identify
+the correct database names.
+
+
+Launching a new Partition
+=========================
+
+To add a new partition, follow these steps:
+
+ - Set up the new database host or hosts.
+ - Add the new database to `cluster.database`, but keep its "partition"
+ configuration empty (just an empty list). If this is the first time you
+ are partitioning, you will need to configure your existing master as the
+ new "default". This will let Phabricator interact with it, but won't send
+ any traffic to it yet.
+ - Run `bin/storage upgrade` to initialize the schemata on the new hosts.
+ - Stop writes to the applications you want to move by putting Phabricator
+ in read-only mode, or shutting down the webserver and daemons, or telling
+ everyone not to touch anything.
+ - Dump the data from the application databases on the old master.
+ - Load the data into the application databases on the new master.
+ - Reconfigure the "partition" setup so that Phabricator knows the databases
+ have moved.
+ - While still in read-only mode, check that all the data appears to be
+ intact.
+ - Resume writes.
+
+You can do this with a small, rarely-used application first (on most installs,
+Slowvote might be a good candidate) if you want to run through the process
+end-to-end before performing a larger, higher-stakes migration.
+
+
+How Partitioning Works
+======================
+
+If you have multiple masters, Phabricator keeps the entire set of schemata up
+to date on all of them. When you run `bin/storage upgrade` or other storage
+management commands, they generally affect all masters (if they do not, they
+will prompt you to be more specific).
+
+When the application goes to read or write normal data (for example, to query a
+list of tasks) it only connects to the master which the application it is
+acting on behalf of is assigned to.
+
+In most cases, a masters will not have any data in most the databases which are
+not assigned to it. If they do (for example, because they previously hosted the
+application) the data is ignored. This approach (of maintaining all schemata on
+all hosts) makes it easier to move data and to quickly revert changes if a
+configuration mistake occurs.
+
+There are some exceptions to this rule. For example, all masters keep track
+of which patches have been applied to that particular master so that
+`bin/storage upgrade` can upgrade hosts correctly.
+
+Phabricator does not perform joins across logical databases, so there are no
+meaningful differences in runtime behavior if two applications are on the same
+physical host or different physical hosts.
+
+
+Next Steps
+==========
+
+Continue by:
+
+ - returning to @{article:Clustering Introduction}.
diff --git a/src/infrastructure/cluster/PhabricatorClusterDatabasesConfigOptionType.php b/src/infrastructure/cluster/PhabricatorClusterDatabasesConfigOptionType.php
--- a/src/infrastructure/cluster/PhabricatorClusterDatabasesConfigOptionType.php
+++ b/src/infrastructure/cluster/PhabricatorClusterDatabasesConfigOptionType.php
@@ -35,6 +35,8 @@
'user' => 'optional string',
'pass' => 'optional string',
'disabled' => 'optional bool',
+ 'master' => 'optional string',
+ 'partition' => 'optional list<string>',
));
} catch (Exception $ex) {
throw new Exception(
diff --git a/src/infrastructure/cluster/PhabricatorDatabaseRef.php b/src/infrastructure/cluster/PhabricatorDatabaseRef.php
--- a/src/infrastructure/cluster/PhabricatorDatabaseRef.php
+++ b/src/infrastructure/cluster/PhabricatorDatabaseRef.php
@@ -36,6 +36,11 @@
private $healthRecord;
private $didFailToConnect;
+ private $isDefaultPartition;
+ private $applicationMap = array();
+ private $masterRef;
+ private $replicaRefs = array();
+
public function setHost($host) {
$this->host = $host;
return $this;
@@ -157,6 +162,43 @@
return $this->isIndividual;
}
+ public function setIsDefaultPartition($is_default_partition) {
+ $this->isDefaultPartition = $is_default_partition;
+ return $this;
+ }
+
+ public function getIsDefaultPartition() {
+ return $this->isDefaultPartition;
+ }
+
+ public function setApplicationMap(array $application_map) {
+ $this->applicationMap = $application_map;
+ return $this;
+ }
+
+ public function getApplicationMap() {
+ return $this->applicationMap;
+ }
+
+ public function setMasterRef(PhabricatorDatabaseRef $master_ref) {
+ $this->masterRef = $master_ref;
+ return $this;
+ }
+
+ public function getMasterRef() {
+ return $this->masterRef;
+ }
+
+ public function addReplicaRef(PhabricatorDatabaseRef $replica_ref) {
+ $this->replicaRefs[] = $replica_ref;
+ return $this;
+ }
+
+ public function getReplicaRefs() {
+ return $this->replicaRefs;
+ }
+
+
public function getRefKey() {
$host = $this->getHost();
@@ -248,8 +290,6 @@
}
public static function newRefs() {
- $refs = array();
-
$default_port = PhabricatorEnv::getEnvConfig('mysql.port');
$default_port = nonempty($default_port, 3306);
@@ -259,33 +299,12 @@
$default_pass = new PhutilOpaqueEnvelope($default_pass);
$config = PhabricatorEnv::getEnvConfig('cluster.databases');
- foreach ($config as $server) {
- $host = $server['host'];
- $port = idx($server, 'port', $default_port);
- $user = idx($server, 'user', $default_user);
- $disabled = idx($server, 'disabled', false);
-
- $pass = idx($server, 'pass');
- if ($pass) {
- $pass = new PhutilOpaqueEnvelope($pass);
- } else {
- $pass = clone $default_pass;
- }
- $role = $server['role'];
-
- $ref = id(new self())
- ->setHost($host)
- ->setPort($port)
- ->setUser($user)
- ->setPass($pass)
- ->setDisabled($disabled)
- ->setIsMaster(($role == 'master'));
-
- $refs[] = $ref;
- }
-
- return $refs;
+ return id(new PhabricatorDatabaseRefParser())
+ ->setDefaultPort($default_port)
+ ->setDefaultUser($default_user)
+ ->setDefaultPass($default_pass)
+ ->newRefs($config);
}
public static function queryAll() {
@@ -471,7 +490,7 @@
return $refs;
}
- public static function getMasterDatabaseRefs() {
+ public static function getAllMasterDatabaseRefs() {
$refs = self::getClusterRefs();
if (!$refs) {
@@ -491,12 +510,42 @@
return $masters;
}
- public static function getMasterDatabaseRefForDatabase($database) {
+ public static function getMasterDatabaseRefs() {
+ $refs = self::getAllMasterDatabaseRefs();
+ return self::getEnabledRefs($refs);
+ }
+
+ public function isApplicationHost($database) {
+ return isset($this->applicationMap[$database]);
+ }
+
+ public static function getMasterDatabaseRefForApplication($application) {
$masters = self::getMasterDatabaseRefs();
- // TODO: Actually implement this.
+ $application_master = null;
+ $default_master = null;
+ foreach ($masters as $master) {
+ if ($master->isApplicationHost($application)) {
+ $application_master = $master;
+ break;
+ }
+ if ($master->getIsDefaultPartition()) {
+ $default_master = $master;
+ }
+ }
- return head($masters);
+ if ($application_master) {
+ $masters = array($application_master);
+ } else if ($default_master) {
+ $masters = array($default_master);
+ } else {
+ $masters = array();
+ }
+
+ $masters = self::getEnabledRefs($masters);
+ $master = head($masters);
+
+ return $master;
}
public static function newIndividualRef() {
@@ -513,7 +562,7 @@
->setIsMaster(true);
}
- public static function getReplicaDatabaseRefs() {
+ public static function getAllReplicaDatabaseRefs() {
$refs = self::getClusterRefs();
if (!$refs) {
@@ -522,9 +571,6 @@
$replicas = array();
foreach ($refs as $ref) {
- if ($ref->getDisabled()) {
- continue;
- }
if ($ref->getIsMaster()) {
continue;
}
@@ -535,10 +581,44 @@
return $replicas;
}
- public static function getReplicaDatabaseRefForDatabase($database) {
+ public static function getReplicaDatabaseRefs() {
+ $refs = self::getAllReplicaDatabaseRefs();
+ return self::getEnabledRefs($refs);
+ }
+
+ private static function getEnabledRefs(array $refs) {
+ foreach ($refs as $key => $ref) {
+ if ($ref->getDisabled()) {
+ unset($refs[$key]);
+ }
+ }
+ return $refs;
+ }
+
+ public static function getReplicaDatabaseRefForApplication($application) {
$replicas = self::getReplicaDatabaseRefs();
- // TODO: Actually implement this.
+ $application_replicas = array();
+ $default_replicas = array();
+ foreach ($replicas as $replica) {
+ $master = $replica->getMaster();
+
+ if ($master->isApplicationHost($application)) {
+ $application_replicas[] = $replica;
+ }
+
+ if ($master->getIsDefaultPartition()) {
+ $default_replicas[] = $replica;
+ }
+ }
+
+ if ($application_replicas) {
+ $replicas = $application_replicas;
+ } else {
+ $replicas = $default_replicas;
+ }
+
+ $replicas = self::getEnabledRefs($replicas);
// TODO: We may have multiple replicas to choose from, and could make
// more of an effort to pick the "best" one here instead of always
diff --git a/src/infrastructure/cluster/PhabricatorDatabaseRefParser.php b/src/infrastructure/cluster/PhabricatorDatabaseRefParser.php
new file mode 100644
--- /dev/null
+++ b/src/infrastructure/cluster/PhabricatorDatabaseRefParser.php
@@ -0,0 +1,216 @@
+<?php
+
+final class PhabricatorDatabaseRefParser
+ extends Phobject {
+
+ private $defaultPort = 3306;
+ private $defaultUser;
+ private $defaultPass;
+
+ public function setDefaultPort($default_port) {
+ $this->defaultPort = $default_port;
+ return $this;
+ }
+
+ public function getDefaultPort() {
+ return $this->defaultPort;
+ }
+
+ public function setDefaultUser($default_user) {
+ $this->defaultUser = $default_user;
+ return $this;
+ }
+
+ public function getDefaultUser() {
+ return $this->defaultUser;
+ }
+
+ public function setDefaultPass($default_pass) {
+ $this->defaultPass = $default_pass;
+ return $this;
+ }
+
+ public function getDefaultPass() {
+ return $this->defaultPass;
+ }
+
+ public function newRefs(array $config) {
+ $default_port = $this->getDefaultPort();
+ $default_user = $this->getDefaultUser();
+ $default_pass = $this->getDefaultPass();
+
+ $refs = array();
+
+ $master_count = 0;
+ foreach ($config as $key => $server) {
+ $host = $server['host'];
+ $port = idx($server, 'port', $default_port);
+ $user = idx($server, 'user', $default_user);
+ $disabled = idx($server, 'disabled', false);
+
+ $pass = idx($server, 'pass');
+ if ($pass) {
+ $pass = new PhutilOpaqueEnvelope($pass);
+ } else {
+ $pass = clone $default_pass;
+ }
+
+ $role = $server['role'];
+ $is_master = ($role == 'master');
+
+ $ref = id(new PhabricatorDatabaseRef())
+ ->setHost($host)
+ ->setPort($port)
+ ->setUser($user)
+ ->setPass($pass)
+ ->setDisabled($disabled)
+ ->setIsMaster($is_master);
+
+ if ($is_master) {
+ $master_count++;
+ }
+
+ $refs[$key] = $ref;
+ }
+
+ $is_partitioned = ($master_count > 1);
+ if ($is_partitioned) {
+ $default_ref = null;
+ $partition_map = array();
+ foreach ($refs as $key => $ref) {
+ if (!$ref->getIsMaster()) {
+ continue;
+ }
+
+ $server = $config[$key];
+ $partition = idx($server, 'partition');
+ if (!is_array($partition)) {
+ throw new Exception(
+ pht(
+ 'Phabricator is configured with multiple master databases, '.
+ 'but master "%s" is missing a "partition" configuration key to '.
+ 'define application partitioning.',
+ $ref->getRefKey()));
+ }
+
+ $application_map = array();
+ foreach ($partition as $application) {
+ if ($application === 'default') {
+ if ($default_ref) {
+ throw new Exception(
+ pht(
+ 'Multiple masters (databases "%s" and "%s") specify that '.
+ 'they are the "default" partition. Only one master may be '.
+ 'the default.',
+ $ref->getRefKey(),
+ $default_ref->getRefKey()));
+ } else {
+ $default_ref = $ref;
+ $ref->setIsDefaultPartition(true);
+ }
+ } else if (isset($partition_map[$application])) {
+ throw new Exception(
+ pht(
+ 'Multiple masters (databases "%s" and "%s") specify that '.
+ 'they are the partition for application "%s". Each '.
+ 'application may be allocated to only one partition.',
+ $partition_map[$application]->getRefKey(),
+ $ref->getRefKey(),
+ $application));
+ } else {
+ // TODO: We should check that the application is valid, to
+ // prevent typos in application names. However, we do not
+ // currently have an efficient way to enumerate all of the valid
+ // application database names.
+
+ $partition_map[$application] = $ref;
+ $application_map[$application] = $application;
+ }
+ }
+
+ $ref->setApplicationMap($application_map);
+ }
+ } else {
+ // If we only have one master, make it the default.
+ foreach ($refs as $ref) {
+ if ($ref->getIsMaster()) {
+ $ref->setIsDefaultPartition(true);
+ }
+ }
+ }
+
+ $ref_map = array();
+ $master_keys = array();
+ foreach ($refs as $ref) {
+ $ref_key = $ref->getRefKey();
+ if (isset($ref_map[$ref_key])) {
+ throw new Exception(
+ pht(
+ 'Multiple configured databases have the same internal '.
+ 'key, "%s". You may have listed a database multiple times.',
+ $ref_key));
+ } else {
+ $ref_map[$ref_key] = $ref;
+ if ($ref->getIsMaster()) {
+ $master_keys[] = $ref_key;
+ }
+ }
+ }
+
+ foreach ($refs as $key => $ref) {
+ if ($ref->getIsMaster()) {
+ continue;
+ }
+
+ $server = $config[$key];
+
+ $partition = idx($server, 'partition');
+ if ($partition !== null) {
+ throw new Exception(
+ pht(
+ 'Database "%s" is configured as a replica, but specifies a '.
+ '"partition". Only master databases may have a partition '.
+ 'configuration. Replicas use the same configuration as the '.
+ 'master they follow.',
+ $ref->getRefKey()));
+ }
+
+ $master_key = idx($server, 'master');
+ if ($master_key === null) {
+ if ($is_partitioned) {
+ throw new Exception(
+ pht(
+ 'Database "%s" is configured as a replica, but does not '.
+ 'specify which "master" it follows in configuration. Valid '.
+ 'masters are: %s.',
+ $ref->getRefKey(),
+ implode(', ', $master_keys)));
+ } else if ($master_keys) {
+ $master_key = head($master_keys);
+ } else {
+ throw new Exception(
+ pht(
+ 'Database "%s" is configured as a replica, but there is no '.
+ 'master configured.',
+ $ref->getRefKey()));
+ }
+ }
+
+ if (!isset($ref_map[$master_key])) {
+ throw new Exception(
+ pht(
+ 'Database "%s" is configured as a replica and specifies a '.
+ 'master ("%s"), but that master is not a valid master. Valid '.
+ 'masters are: %s.',
+ implode(', ', $master_keys)));
+ }
+
+ $master_ref = $ref_map[$master_key];
+ $ref->setMasterRef($ref_map[$master_key]);
+ $master_ref->addReplicaRef($ref);
+ }
+
+ return array_values($refs);
+ }
+
+}
diff --git a/src/infrastructure/storage/lisk/PhabricatorLiskDAO.php b/src/infrastructure/storage/lisk/PhabricatorLiskDAO.php
--- a/src/infrastructure/storage/lisk/PhabricatorLiskDAO.php
+++ b/src/infrastructure/storage/lisk/PhabricatorLiskDAO.php
@@ -62,7 +62,10 @@
$is_cluster = (bool)PhabricatorEnv::getEnvConfig('cluster.databases');
if ($is_cluster) {
- $connection = $this->newClusterConnection($database, $mode);
+ $connection = $this->newClusterConnection(
+ $this->getApplicationName(),
+ $database,
+ $mode);
} else {
$connection = $this->newBasicConnection($database, $mode, $namespace);
}
@@ -113,9 +116,9 @@
));
}
- private function newClusterConnection($database, $mode) {
- $master = PhabricatorDatabaseRef::getMasterDatabaseRefForDatabase(
- $database);
+ private function newClusterConnection($application, $database, $mode) {
+ $master = PhabricatorDatabaseRef::getMasterDatabaseRefForApplication(
+ $application);
if ($master && !$master->isSevered()) {
$connection = $master->newApplicationConnection($database);
@@ -131,8 +134,8 @@
}
}
- $replica = PhabricatorDatabaseRef::getReplicaDatabaseRefForDatabase(
- $database);
+ $replica = PhabricatorDatabaseRef::getReplicaDatabaseRefForApplication(
+ $application);
if ($replica) {
$connection = $replica->newApplicationConnection($database);
$connection->setReadOnly(true);
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D16876: Support application partitioning across multiple masters
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