fix db_test error with scribe logger turned on

Summary: as subject

Test Plan: db_test

Reviewers: dhruba

Reviewed By: dhruba

Differential Revision: https://reviews.facebook.net/D4929

db/db_impl.cc

@@ -134,6 +134,7 @@ DBImpl::DBImpl(const Options& options, const std::string& dbname)
       log_(NULL),
       tmp_batch_(new WriteBatch),
       bg_compaction_scheduled_(false),
+      bg_logstats_scheduled_(false),
       manual_compaction_(NULL),
       logger_(NULL) {
   mem_->Ref();
@@ -168,7 +169,7 @@ DBImpl::~DBImpl() {
   // Wait for background work to finish
   mutex_.Lock();
   shutting_down_.Release_Store(this);  // Any non-NULL value is ok
-  while (bg_compaction_scheduled_) {
+  while (bg_compaction_scheduled_ || bg_logstats_scheduled_) {
     bg_cv_.Wait();
   }
   mutex_.Unlock();
@@ -192,6 +193,8 @@ DBImpl::~DBImpl() {
   if (owns_cache_) {
     delete options_.block_cache;
   }
+
+  delete logger_;
 }
 
 Status DBImpl::NewDB() {

db/db_impl.h

@@ -115,7 +115,8 @@ class DBImpl : public DB {
   Status WaitForCompactMemTable();
 
   void MaybeScheduleLogDBDeployStats();
-  static void LogDBDeployStats(void* db);
+  static void BGLogDBDeployStats(void* db);
+  void LogDBDeployStats();
 
   void MaybeScheduleCompaction();
   static void BGWork(void* db);
@@ -169,6 +170,9 @@ class DBImpl : public DB {
   // Has a background compaction been scheduled or is running?
   bool bg_compaction_scheduled_;
 
+  // Has a background stats log thread scheduled?
+  bool bg_logstats_scheduled_;
+
   // Information for a manual compaction
   struct ManualCompaction {
     int level;

db/db_stats_logger.cc

@@ -8,6 +8,8 @@
 #include "db/version_set.h"
 #include "leveldb/db.h"
 #include "leveldb/env.h"
+#include "port/port.h"
+#include "util/mutexlock.h"
 
 namespace leveldb {
 
@@ -18,7 +20,8 @@ void DBImpl::MaybeScheduleLogDBDeployStats() {
       || host_name_.empty()) {
     return;
   }
-  if (shutting_down_.Acquire_Load()) {
+
+  if(bg_logstats_scheduled_ || shutting_down_.Acquire_Load()) {
     // Already scheduled
   } else {
     int64_t current_ts = 0;
@@ -30,43 +33,59 @@ void DBImpl::MaybeScheduleLogDBDeployStats() {
       return;
     }
     last_log_ts = current_ts;
-    env_->Schedule(&DBImpl::LogDBDeployStats, this);
+    bg_logstats_scheduled_ = true;
+    env_->Schedule(&DBImpl::BGLogDBDeployStats, this);
   }
 }
 
-void DBImpl::LogDBDeployStats(void* db) {
+void DBImpl::BGLogDBDeployStats(void* db) {
   DBImpl* db_inst = reinterpret_cast<DBImpl*>(db);
+  db_inst->LogDBDeployStats();
+}
+
+void DBImpl::LogDBDeployStats() {
+  mutex_.Lock();
 
-  if (db_inst->shutting_down_.Acquire_Load()) {
+  if (shutting_down_.Acquire_Load()) {
+    bg_logstats_scheduled_ = false;
+    bg_cv_.SignalAll();
+    mutex_.Unlock();
     return;
   }
 
+  mutex_.Unlock();
+
   std::string version_info;
   version_info += boost::lexical_cast<std::string>(kMajorVersion);
   version_info += ".";
   version_info += boost::lexical_cast<std::string>(kMinorVersion);
   std::string data_dir;
-  db_inst->env_->GetAbsolutePath(db_inst->dbname_, &data_dir);
+  env_->GetAbsolutePath(dbname_, &data_dir);
 
   uint64_t file_total_size = 0;
   uint32_t file_total_num = 0;
-  for (int i = 0; i < db_inst->versions_->NumberLevels(); i++) {
-    file_total_num += db_inst->versions_->NumLevelFiles(i);
-    file_total_size += db_inst->versions_->NumLevelBytes(i);
+  for (int i = 0; i < versions_->NumberLevels(); i++) {
+    file_total_num += versions_->NumLevelFiles(i);
+    file_total_size += versions_->NumLevelBytes(i);
   }
 
   VersionSet::LevelSummaryStorage scratch;
-  const char* file_num_summary = db_inst->versions_->LevelSummary(&scratch);
+  const char* file_num_summary = versions_->LevelSummary(&scratch);
   std::string file_num_per_level(file_num_summary);
-  const char* file_size_summary = db_inst->versions_->LevelDataSizeSummary(
+  const char* file_size_summary = versions_->LevelDataSizeSummary(
       &scratch);
   std::string data_size_per_level(file_num_summary);
   int64_t unix_ts;
-  db_inst->env_->GetCurrentTime(&unix_ts);
+  env_->GetCurrentTime(&unix_ts);
 
-  db_inst->logger_->Log_Deploy_Stats(version_info, db_inst->host_name_,
+  logger_->Log_Deploy_Stats(version_info, host_name_,
       data_dir, file_total_size, file_total_num, file_num_per_level,
       data_size_per_level, unix_ts);
+
+  mutex_.Lock();
+  bg_logstats_scheduled_ = false;
+  bg_cv_.SignalAll();
+  mutex_.Unlock();
 }
 
 }

db/version_set.cc

@@ -22,7 +22,7 @@ namespace leveldb {
 
 static int64_t TotalFileSize(const std::vector<FileMetaData*>& files) {
   int64_t sum = 0;
-  for (size_t i = 0; i < files.size(); i++) {
+  for (size_t i = 0; i < files.size() && files[i]; i++) {
     sum += files[i]->file_size;
   }
   return sum;
@@ -1223,7 +1223,10 @@ void VersionSet::AddLiveFiles(std::set<uint64_t>* live) {
 int64_t VersionSet::NumLevelBytes(int level) const {
   assert(level >= 0);
   assert(level < NumberLevels());
-  return TotalFileSize(current_->files_[level]);
+  if(current_ && level < current_->files_->size())
+    return TotalFileSize(current_->files_[level]);
+  else
+    return 0;
 }
 
 int64_t VersionSet::MaxNextLevelOverlappingBytes() {

scribe/scribe_logger.cc

@@ -6,12 +6,11 @@ const std::string ScribeLogger::COL_SEPERATOR = "\x1";
 const std::string ScribeLogger::DEPLOY_STATS_CATEGORY = "leveldb_deploy_stats";
 
 ScribeLogger::ScribeLogger(const std::string& host, int port,
-    int retry_times, uint32_t retry_intervals, int batch_size)
+    int retry_times, uint32_t retry_intervals)
   : host_(host),
     port_(port),
     retry_times_(retry_times),
-    retry_intervals_ (retry_intervals),
-    batch_size_ (batch_size) {
+    retry_intervals_ (retry_intervals) {
   shared_ptr<TSocket> socket(new TSocket(host_, port_));
   shared_ptr<TFramedTransport> framedTransport(new TFramedTransport(socket));
   framedTransport->open();
@@ -25,23 +24,16 @@ void ScribeLogger::Log(const std::string& category,
   entry.category = category;
   entry.message = message;
 
-  logger_mutex_.Lock();
-  logs_.push_back(entry);
-
-  if (logs_.size() >= batch_size_) {
-    ResultCode  ret = scribe_client_->Log(logs_);
-    int retries_left = retry_times_;
-    while (ret == TRY_LATER && retries_left > 0) {
-      Env::Default()->SleepForMicroseconds(retry_intervals_);
-      ret = scribe_client_->Log(logs_);
-      retries_left--;
-    }
+  std::vector<LogEntry> logs;
+  logs.push_back(entry);
 
-    // Clear the local messages if either successfully write out
-    // or has failed in the last 10 calls.
-    if (ret == OK || logs_.size() > batch_size_ * 5) {
-      logs_.clear();
-    }
+  logger_mutex_.Lock();
+  ResultCode  ret = scribe_client_->Log(logs);
+  int retries_left = retry_times_;
+  while (ret == TRY_LATER && retries_left > 0) {
+    Env::Default()->SleepForMicroseconds(retry_intervals_);
+    ret = scribe_client_->Log(logs);
+    retries_left--;
   }
 
   logger_mutex_.Unlock();

scribe/scribe_logger.h

@@ -34,7 +34,6 @@ private:
   int batch_size_;
 
   scribeClient* scribe_client_;
-  std::vector<LogEntry> logs_;
   port::Mutex logger_mutex_;
 
   int retry_times_;
@@ -48,8 +47,7 @@ public:
   static const std::string DEPLOY_STATS_CATEGORY;
 
   ScribeLogger(const std::string& host, int port,
-      int retry_times=3, uint32_t retry_intervals=1000000,
-      int batch_size=1);
+      int retry_times=3, uint32_t retry_intervals=1000000);
   virtual ~ScribeLogger();
 
   virtual void Log(const std::string& category, const std::string& message);