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Made Cache populate Sync with jobs for the pre-existing stuff in the cache

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on startup.
This commit is contained in:
Patrick LeBlanc
2019-07-12 14:59:23 -05:00
parent d43f9d855c
commit f7014c25e6
2 changed files with 24 additions and 10 deletions
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24
src/Cache.cpp
View File

@@ -112,7 +112,9 @@ Cache::Cache() : currentCacheSize(0)
throw e;
}
populate();
lru_mutex.lock(); // unlocked by populate() when it's done
boost::thread t([this] { this->populate(); });
t.detach();
}
Cache::~Cache()
@@ -121,8 +123,10 @@ Cache::~Cache()
void Cache::populate()
{
Synchronizer *sync = Synchronizer::get();
bf::directory_iterator dir(prefix);
bf::directory_iterator dend;
vector<string> newObjects;
while (dir != dend)
{
// put everything in lru & m_lru
@@ -133,13 +137,17 @@ void Cache::populate()
auto last = lru.end();
m_lru.insert(--last);
currentCacheSize += bf::file_size(*dir);
newObjects.push_back(p.filename().string());
}
else
logger->log(LOG_WARNING, "Cache: found something in the cache that does not belong '%s'", p.string().c_str());
++dir;
}
sync->newObjects(newObjects);
newObjects.clear();
// account for what's in the journal dir
vector<pair<string, size_t> > newJournals;
dir = bf::directory_iterator(journalPrefix);
while (dir != dend)
{
@@ -147,7 +155,11 @@ void Cache::populate()
if (bf::is_regular_file(p))
{
if (p.extension() == ".journal")
currentCacheSize += bf::file_size(*dir);
{
size_t s = bf::file_size(*dir);
currentCacheSize += s;
newJournals.push_back(pair<string, size_t>(p.stem().string(), s));
}
else
logger->log(LOG_WARNING, "Cache: found a file in the journal dir that does not belong '%s'", p.string().c_str());
}
@@ -155,7 +167,10 @@ void Cache::populate()
logger->log(LOG_WARNING, "Cache: found something in the journal dir that does not belong '%s'", p.string().c_str());
++dir;
}
lru_mutex.unlock();
sync->newJournalEntries(newJournals);
}
// be careful using this! SM should be idle. No ongoing reads or writes.
void Cache::validateCacheSize()
{
@@ -284,7 +299,7 @@ void Cache::read(const vector<string> &keys)
// DNE or if there's an existing download that hasn't finished yet. Starting the download
// includes waiting for an existing download to finish, which from this class's pov is the
// same thing.
if (doNotEvict.find(key) == doNotEvict.end() || downloader.inProgress(key))
if (doNotEvict.find(key) == doNotEvict.end() || downloader->inProgress(key))
keysToFetch.push_back(&key);
else
cout << "Cache: detected and stopped a racey download" << endl;
@@ -476,8 +491,6 @@ void Cache::_makeSpace(size_t size)
ssize_t thisMuch = currentCacheSize + size - maxCacheSize;
if (thisMuch <= 0)
return;
if (thisMuch > (ssize_t) currentCacheSize)
thisMuch = currentCacheSize;
LRU_t::iterator it;
while (thisMuch > 0 && !lru.empty())
@@ -487,6 +500,7 @@ void Cache::_makeSpace(size_t size)
// makeSpace() call.
while (it != lru.end())
{
// make sure it's not currently being read or being flushed by another _makeSpace() call
if ((doNotEvict.find(it) == doNotEvict.end()) && (toBeDeleted.find(it) == toBeDeleted.end()))
break;
++it;

4
src/IOCoordinator.cpp
View File

@@ -180,9 +180,9 @@ ssize_t IOCoordinator::read(const char *_filename, uint8_t *data, off_t offset,
}
else if (errno != ENOENT)
{
int l_errno = errno;
fileLock.unlock();
cache->doneReading(keys);
int l_errno = errno;
logger->log(LOG_CRIT, "IOCoordinator::read(): Got an unexpected error opening %s, error was '%s'",
filename.c_str(), strerror_r(l_errno, buf, 80));
errno = l_errno;
@@ -194,9 +194,9 @@ ssize_t IOCoordinator::read(const char *_filename, uint8_t *data, off_t offset,
fd = ::open(filename.c_str(), O_RDONLY);
if (fd < 0)
{
int l_errno = errno;
fileLock.unlock();
cache->doneReading(keys);
int l_errno = errno;
logger->log(LOG_CRIT, "IOCoordinator::read(): Got an unexpected error opening %s, error was '%s'",
filename.c_str(), strerror_r(l_errno, buf, 80));
errno = l_errno;