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/**
* Copyright (C) 2015 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kCommand
#include "mongo/platform/basic.h"
#include <string>
#include <vector>
#include "mongo/client/connpool.h"
#include "mongo/db/commands.h"
#include "mongo/db/operation_context.h"
#include "mongo/s/catalog/sharding_catalog_client.h"
#include "mongo/s/catalog/type_chunk.h"
#include "mongo/s/client/shard.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/grid.h"
#include "mongo/util/log.h"
namespace mongo {
using std::string;
using std::vector;
namespace {
class RemoveShardCmd : public Command {
public:
RemoveShardCmd() : Command("removeShard", false, "removeshard") {}
virtual bool slaveOk() const {
return true;
}
virtual bool adminOnly() const {
return true;
}
virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
virtual void help(std::stringstream& help) const {
help << "remove a shard from the system.";
}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {
ActionSet actions;
actions.addAction(ActionType::removeShard);
out->push_back(Privilege(ResourcePattern::forClusterResource(), actions));
}
virtual bool run(OperationContext* txn,
const std::string& dbname,
BSONObj& cmdObj,
int options,
std::string& errmsg,
BSONObjBuilder& result) {
uassert(ErrorCodes::TypeMismatch,
str::stream() << "Field '" << cmdObj.firstElement().fieldName()
<< "' must be of type String",
cmdObj.firstElement().type() == BSONType::String);
const string target = cmdObj.firstElement().str();
const auto shardStatus = grid.shardRegistry()->getShard(txn, ShardId(target));
if (!shardStatus.isOK()) {
string msg(str::stream() << "Could not drop shard '" << target
<< "' because it does not exist");
log() << msg;
return appendCommandStatus(result, Status(ErrorCodes::ShardNotFound, msg));
}
const auto s = shardStatus.getValue();
auto catalogClient = grid.catalogClient(txn);
StatusWith<ShardDrainingStatus> removeShardResult =
catalogClient->removeShard(txn, s->getId());
if (!removeShardResult.isOK()) {
return appendCommandStatus(result, removeShardResult.getStatus());
}
vector<string> databases;
Status status = catalogClient->getDatabasesForShard(txn, s->getId(), &databases);
if (!status.isOK()) {
return appendCommandStatus(result, status);
}
// Get BSONObj containing:
// 1) note about moving or dropping databases in a shard
// 2) list of databases (excluding 'local' database) that need to be moved
BSONObj dbInfo;
{
BSONObjBuilder dbInfoBuilder;
dbInfoBuilder.append("note", "you need to drop or movePrimary these databases");
BSONArrayBuilder dbs(dbInfoBuilder.subarrayStart("dbsToMove"));
for (vector<string>::const_iterator it = databases.begin(); it != databases.end();
it++) {
if (*it != "local") {
dbs.append(*it);
}
}
dbs.doneFast();
dbInfo = dbInfoBuilder.obj();
}
// TODO: Standardize/Seperate how we append to the result object
switch (removeShardResult.getValue()) {
case ShardDrainingStatus::STARTED:
result.append("msg", "draining started successfully");
result.append("state", "started");
result.append("shard", s->getId().toString());
result.appendElements(dbInfo);
break;
case ShardDrainingStatus::ONGOING: {
vector<ChunkType> chunks;
Status status =
catalogClient->getChunks(txn,
BSON(ChunkType::shard(s->getId().toString())),
BSONObj(),
boost::none, // return all
&chunks,
nullptr,
repl::ReadConcernLevel::kMajorityReadConcern);
if (!status.isOK()) {
return appendCommandStatus(result, status);
}
result.append("msg", "draining ongoing");
result.append("state", "ongoing");
{
BSONObjBuilder inner;
inner.append("chunks", static_cast<long long>(chunks.size()));
inner.append("dbs", static_cast<long long>(databases.size()));
BSONObj b = inner.obj();
result.append("remaining", b);
}
result.appendElements(dbInfo);
break;
}
case ShardDrainingStatus::COMPLETED:
result.append("msg", "removeshard completed successfully");
result.append("state", "completed");
result.append("shard", s->getId().toString());
}
return true;
}
} removeShardCmd;
} // namespace
} // namespace mongo
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