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access_scanner.cc
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access_scanner.cc
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/* -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* Copyright 2012 Couchbase, Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "config.h"
#include <iostream>
#include "access_scanner.h"
#include "ep_engine.h"
class ItemAccessVisitor : public VBucketVisitor {
public:
ItemAccessVisitor(EventuallyPersistentStore &_store, EPStats &_stats,
bool *sfin) :
store(_store), stats(_stats), startTime(ep_real_time()),
stateFinalizer(sfin)
{
Configuration &conf = store.getEPEngine().getConfiguration();
name = conf.getAlogPath();
prev = name + ".old";
next = name + ".next";
log = new MutationLog(next, conf.getAlogBlockSize());
assert(log != NULL);
log->open();
if (!log->isOpen()) {
LOG(EXTENSION_LOG_WARNING, "FATAL: Failed to open access log: %s",
next.c_str());
delete log;
log = NULL;
}
}
void visit(StoredValue *v) {
if (log != NULL && v->isResident()) {
if (v->isExpired(startTime) || v->isDeleted()) {
LOG(EXTENSION_LOG_INFO, "INFO: Skipping expired/deleted item: %s",
v->getKey().c_str());
} else {
log->newItem(currentBucket->getId(), v->getKey(), v->getId());
}
}
}
bool visitBucket(RCPtr<VBucket> &vb) {
if (log == NULL) {
return false;
}
return VBucketVisitor::visitBucket(vb);
}
virtual void complete() {
if (stateFinalizer) {
*stateFinalizer = true;
}
if (log != NULL) {
size_t num_items = log->itemsLogged[ML_NEW];
log->commit1();
log->commit2();
delete log;
log = NULL;
++stats.alogRuns;
stats.alogRuntime.set(ep_real_time() - startTime);
stats.alogNumItems.set(num_items);
if (num_items == 0) {
LOG(EXTENSION_LOG_INFO, "The new access log is empty. "
"Delete it without replacing the current access log...\n");
remove(next.c_str());
return;
}
if (access(prev.c_str(), F_OK) == 0 && remove(prev.c_str()) == -1) {
LOG(EXTENSION_LOG_WARNING, "FATAL: Failed to remove '%s': %s",
prev.c_str(), strerror(errno));
remove(next.c_str());
} else if (access(name.c_str(), F_OK) == 0 && rename(name.c_str(), prev.c_str()) == -1) {
LOG(EXTENSION_LOG_WARNING, "FATAL: Failed to rename '%s' to '%s': %s",
name.c_str(), prev.c_str(), strerror(errno));
remove(next.c_str());
} else if (rename(next.c_str(), name.c_str()) == -1) {
LOG(EXTENSION_LOG_WARNING, "FATAL: Failed to rename '%s' to '%s': %s",
next.c_str(), name.c_str(), strerror(errno));
remove(next.c_str());
}
}
}
private:
EventuallyPersistentStore &store;
EPStats &stats;
rel_time_t startTime;
std::string prev;
std::string next;
std::string name;
MutationLog *log;
bool *stateFinalizer;
};
AccessScanner::AccessScanner(EventuallyPersistentStore &_store, EPStats &st,
size_t sleeptime) :
store(_store), stats(st), sleepTime(sleeptime), available(true)
{ }
bool AccessScanner::callback(Dispatcher &d, TaskId &t) {
if (available) {
available = false;
shared_ptr<ItemAccessVisitor> pv(new ItemAccessVisitor(store, stats, &available));
store.resetAccessScannerTasktime();
store.visit(pv, "Item access scanner", &d, Priority::AccessScannerPriority);
}
d.snooze(t, sleepTime);
stats.alogTime.set(t->getWaketime().tv_sec);
return true;
}
std::string AccessScanner::description() {
return std::string("Generating access log");
}
size_t AccessScanner::startTime() {
Configuration &cfg = store.getEPEngine().getConfiguration();
return cfg.getAlogTaskTime();
}