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/** @file touch.cpp
compaction of deleted space in pdfiles (datafiles)
*/
/**
* Copyright (C) 2012 10gen 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,b
* 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.
*/
#include "mongo/pch.h"
#include <string>
#include <vector>
#include "mongo/db/auth/action_set.h"
#include "mongo/db/auth/action_type.h"
#include "mongo/db/auth/authorization_manager.h"
#include "mongo/db/auth/privilege.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/commands.h"
#include "mongo/db/curop-inl.h"
#include "mongo/db/d_concurrency.h"
#include "mongo/db/index/index_descriptor.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/kill_current_op.h"
#include "mongo/db/pdfile.h"
#include "mongo/util/timer.h"
#include "mongo/util/touch_pages.h"
namespace mongo {
struct touch_location {
const char* root;
size_t length;
};
/** @return numRanges touched */
int touchNs( const std::string& ns ) {
std::vector< touch_location > ranges;
boost::scoped_ptr<LockMongoFilesShared> mongoFilesLock;
{
Client::ReadContext ctx(ns);
Database* db = ctx.ctx().db();
ExtentManager& em = db->getExtentManager();
Collection* collection = db->getCollection( ns );
uassert( 16154, "namespace does not exist", collection );
Extent* ext = em.getExtent( collection->details()->firstExtent() );
while ( ext ) {
touch_location tl;
tl.root = reinterpret_cast<const char*>(ext);
tl.length = ext->length;
ranges.push_back(tl);
ext = em.getNextExtent( ext );
}
mongoFilesLock.reset(new LockMongoFilesShared());
}
// DB read lock is dropped; no longer needed after this point.
std::string progress_msg = "touch " + ns + " extents";
ProgressMeterHolder pm(cc().curop()->setMessage(progress_msg.c_str(),
"Touch Progress",
ranges.size()));
for ( std::vector< touch_location >::iterator it = ranges.begin(); it != ranges.end(); ++it ) {
touch_pages( it->root, it->length );
pm.hit();
killCurrentOp.checkForInterrupt();
}
pm.finished();
return static_cast<int>( ranges.size() );
}
class TouchCmd : public Command {
public:
virtual LockType locktype() const { return NONE; }
virtual bool adminOnly() const { return false; }
virtual bool slaveOk() const { return true; }
virtual bool maintenanceMode() const { return true; }
virtual bool logTheOp() { return false; }
virtual void help( stringstream& help ) const {
help << "touch collection\n"
"Page in all pages of memory containing every extent for the given collection\n"
"{ touch : <collection_name>, [data : true] , [index : true] }\n"
" at least one of data or index must be true; default is both are false\n";
}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {
ActionSet actions;
actions.addAction(ActionType::touch);
out->push_back(Privilege(ResourcePattern::forClusterResource(), actions));
}
TouchCmd() : Command("touch") { }
virtual bool run(const string& db,
BSONObj& cmdObj,
int,
string& errmsg,
BSONObjBuilder& result,
bool fromRepl) {
string coll = cmdObj.firstElement().valuestr();
if( coll.empty() || db.empty() ) {
errmsg = "no collection name specified";
return false;
}
string ns = db + '.' + coll;
if ( ! NamespaceString::normal(ns.c_str()) ) {
errmsg = "bad namespace name";
return false;
}
bool touch_indexes( cmdObj["index"].trueValue() );
bool touch_data( cmdObj["data"].trueValue() );
if ( ! (touch_indexes || touch_data) ) {
errmsg = "must specify at least one of (data:true, index:true)";
return false;
}
bool ok = touch( ns, errmsg, touch_data, touch_indexes, result );
return ok;
}
bool touch( std::string& ns,
std::string& errmsg,
bool touch_data,
bool touch_indexes,
BSONObjBuilder& result ) {
if (touch_data) {
log() << "touching namespace " << ns << endl;
Timer t;
int numRanges = touchNs( ns );
result.append( "data", BSON( "numRanges" << numRanges <<
"millis" << t.millis() ) );
log() << "touching namespace " << ns << " complete" << endl;
}
if (touch_indexes) {
Timer t;
// enumerate indexes
std::vector< std::string > indexes;
{
Client::ReadContext ctx(ns);
Collection* collection = ctx.ctx().db()->getCollection( ns );
massert( 16153, "namespace does not exist", collection );
IndexCatalog::IndexIterator ii =
collection->getIndexCatalog()->getIndexIterator( false );
while ( ii.more() ) {
IndexDescriptor* desc = ii.next();
indexes.push_back( desc->indexNamespace() );
}
}
int numRanges = 0;
for ( std::vector<std::string>::const_iterator it = indexes.begin();
it != indexes.end();
it++ ) {
numRanges += touchNs( *it );
}
result.append( "indexes", BSON( "num" << static_cast<int>(indexes.size()) <<
"numRanges" << numRanges <<
"millis" << t.millis() ) );
}
return true;
}
};
static TouchCmd touchCmd;
}
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