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arangodb
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Allow removing dbservers

This commit is contained in:
Andreas Streichardt 2017-02-13 17:19:27 +01:00
parent a49fe5ad21
commit 1b92c8e46b
1 changed files with 83 additions and 33 deletions
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116
js/actions/api-cluster.js
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@ -96,12 +96,39 @@ actions.defineHttp({
return;
}
if (node.Role !== 'Coordinator') {
if (node.Role !== 'Coordinator' && node.Role !== 'DBServer') {
actions.resultError(req, res, actions.HTTP_BAD,
'only coordinators can be removed at this time');
'unhandled role ' + node.role);
return;
}
let preconditions = {};
preconditions['/arango/Supervision/Health/' + serverId + '/Status'] = {'old': 'FAILED'};
// need to make sure it is not responsible for anything
if (node.Role == 'DBServer') {
let used = [];
preconditions = reducePlanServers(function(data, agencyKey, servers) {
data[agencyKey] = {'old': servers};
if (servers.indexOf(serverId) !== -1) {
used.push(agencyKey);
}
return data;
}, {});
preconditions = reduceCurrentServers(function(data, agencyKey, servers) {
data[agencyKey] = {'old': servers};
if (servers.indexOf(serverId) !== -1) {
used.push(agencyKey);
}
return data;
}, preconditions);
if (used.length > 0) {
actions.resultError(req, res, actions.HTTP_PRECONDITION_FAILED,
'the server is still in use at the following locations: ' + JSON.stringify(used));
return;
}
}
let operations = {};
operations['/arango/Coordinators/' + serverId] = {'op': 'delete'};
operations['/arango/DBServers/' + serverId] = {'op': 'delete'};
@ -109,9 +136,6 @@ actions.defineHttp({
operations['/arango/Supervision/Health/' + serverId] = {'op': 'delete'};
operations['/arango/MapUniqueToShortID/' + serverId] = {'op': 'delete'};
let preconditions = {};
preconditions['/arango/Supervision/Health/' + serverId + '/Status'] = {'old': 'FAILED'};
try {
global.ArangoAgency.write([[operations, preconditions]]);
} catch (e) {
@ -572,42 +596,68 @@ actions.defineHttp({
}
});
function reducePlanServers(reducer, data) {
var databases = ArangoAgency.get('Plan/Collections');
databases = databases.arango.Plan.Collections;
return Object.keys(databases).reduce(function(data, databaseName) {
var collections = databases[databaseName];
return Object.keys(collections).reduce(function(data, collectionKey) {
var collection = collections[collectionKey];
return Object.keys(collection.shards).reduce(function(data, shardKey) {
var servers = collection.shards[shardKey];
let key = '/arango/Plan/Collections/' + databaseName + '/' + collectionKey + '/shards/' + shardKey;
return reducer(data, key, servers);
}, data);
}, data);
}, data);
}
function reduceCurrentServers(reducer, data) {
var databases = ArangoAgency.get('Current/Collections');
databases = databases.arango.Current.Collections;
return Object.keys(databases).reduce(function(data, databaseName) {
var collections = databases[databaseName];
return Object.keys(collections).reduce(function(data, collectionKey) {
var collection = collections[collectionKey];
return Object.keys(collection).reduce(function(data, shardKey) {
var servers = collection[shardKey].servers;
let key = '/arango/Current/Collections/' + databaseName + '/' + collectionKey + '/' + shardKey + '/servers';
return reducer(data, key, servers);
}, data);
}, data);
}, data);
}
// //////////////////////////////////////////////////////////////////////////////
// / @brief changes responsibility for all shards from oldServer to newServer.
// / This needs to be done atomically!
// //////////////////////////////////////////////////////////////////////////////
function changeAllShardReponsibilities (oldServer, newServer) {
// This is only called when we have the write lock and we "only" have to
// make sure that either all or none of the shards are moved.
var databases = ArangoAgency.get('Plan/Collections');
databases = databases.arango.Plan.Collections;
let operations = {};
let preconditions = {};
Object.keys(databases).forEach(function(databaseName) {
var collections = databases[databaseName];
Object.keys(collections).forEach(function(collectionKey) {
var collection = collections[collectionKey];
Object.keys(collection.shards).forEach(function (shardKey) {
var servers = collection.shards[shardKey];
var oldServers = _.cloneDeep(servers);
servers = servers.map(function(server) {
if (server === oldServer) {
return newServer;
} else {
return server;
}
});
let key = '/arango/Plan/Collections/' + databaseName + '/' + collectionKey + '/shards/' + shardKey;
operations[key] = servers;
preconditions[key] = {'old': oldServers};
});
return reducePlanServers(function(data, key, servers) {
var oldServers = _.cloneDeep(servers);
servers = servers.map(function(server) {
if (server === oldServer) {
return newServer;
} else {
return server;
}
});
data.operations[key] = servers;
data.preconditions[key] = {'old': oldServers};
return data;
}, {
operations: {},
preconditions: {},
});
return {operations, preconditions};
}
// //////////////////////////////////////////////////////////////////////////////