Export Import sst files

CMakeLists.txt

@@ -520,6 +520,7 @@ set(SOURCES
         db/flush_job.cc
         db/flush_scheduler.cc
         db/forward_iterator.cc
+	db/import_column_family_job.cc
         db/internal_stats.cc
         db/logs_with_prep_tracker.cc
         db/log_reader.cc

Makefile

@@ -499,6 +499,7 @@ TESTS = \
 	plain_table_db_test \
 	comparator_db_test \
 	external_sst_file_test \
+	import_column_family_test \
 	prefix_test \
 	skiplist_test \
 	write_buffer_manager_test \
@@ -575,6 +576,7 @@ PARALLEL_TEST = \
 	db_universal_compaction_test \
 	db_wal_test \
 	external_sst_file_test \
+	import_column_family_test \
 	fault_injection_test \
 	inlineskiplist_test \
 	manual_compaction_test \
@@ -1272,6 +1274,9 @@ external_sst_file_basic_test: db/external_sst_file_basic_test.o db/db_test_util.
 external_sst_file_test: db/external_sst_file_test.o db/db_test_util.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(AM_LINK)
 
+import_column_family_test: db/import_column_family_test.o db/db_test_util.o $(LIBOBJECTS) $(TESTHARNESS)
+	$(AM_LINK)
+
 db_tailing_iter_test: db/db_tailing_iter_test.o db/db_test_util.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(AM_LINK)
 

TARGETS

@@ -113,6 +113,7 @@ cpp_library(
         "db/flush_job.cc",
         "db/flush_scheduler.cc",
         "db/forward_iterator.cc",
+        "db/import_column_family_job.cc",
         "db/internal_stats.cc",
         "db/log_reader.cc",
         "db/log_writer.cc",

db/compacted_db_impl.h

@@ -85,6 +85,15 @@ class CompactedDBImpl : public DBImpl {
       const IngestExternalFileOptions& /*ingestion_options*/) override {
     return Status::NotSupported("Not supported in compacted db mode.");
   }
+  using DB::CreateColumnFamilyWithImport;
+  virtual Status CreateColumnFamilyWithImport(
+      const ColumnFamilyOptions& /*options*/,
+      const std::string& /*column_family_name*/,
+      const ImportColumnFamilyOptions& /*import_options*/,
+      const ExportImportFilesMetaData& /*metadata*/,
+      ColumnFamilyHandle** /*handle*/) override {
+    return Status::NotSupported("Not supported in compacted db mode.");
+  }
 
  private:
   friend class DB;

db/db_impl/db_impl.cc

@@ -32,6 +32,7 @@
 #include "db/error_handler.h"
 #include "db/event_helpers.h"
 #include "db/external_sst_file_ingestion_job.h"
+#include "db/import_column_family_job.h"
 #include "db/flush_job.h"
 #include "db/forward_iterator.h"
 #include "db/job_context.h"
@@ -3877,6 +3878,127 @@ Status DBImpl::IngestExternalFiles(
   return status;
 }
 
+Status DBImpl::CreateColumnFamilyWithImport(
+    const ColumnFamilyOptions& options, const std::string& column_family_name,
+    const ImportColumnFamilyOptions& import_options,
+    const ExportImportFilesMetaData& metadata,
+    ColumnFamilyHandle** handle) {
+  assert(handle != nullptr);
+  assert(*handle == nullptr);
+  std::string cf_comparator_name = options.comparator->Name();
+  if (cf_comparator_name != metadata.db_comparator_name) {
+    return Status::InvalidArgument("Comparator name mismatch");
+  }
+
+  // Create column family.
+  auto status = CreateColumnFamily(options, column_family_name, handle);
+  if (!status.ok()) {
+    return status;
+  }
+
+  // Import sst files from metadata.
+  auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(*handle);
+  auto cfd = cfh->cfd();
+  ImportColumnFamilyJob import_job(env_, versions_.get(), cfd,
+                                   immutable_db_options_, env_options_,
+                                   import_options, metadata.files);
+
+  SuperVersionContext dummy_sv_ctx(/* create_superversion */ true);
+  VersionEdit dummy_edit;
+  uint64_t next_file_number = 0;
+  std::list<uint64_t>::iterator pending_output_elem;
+  {
+    // Lock db mutex
+    InstrumentedMutexLock l(&mutex_);
+    if (error_handler_.IsDBStopped()) {
+      // Don't import files when there is a bg_error
+      status = error_handler_.GetBGError();
+    }
+
+    // Make sure that bg cleanup wont delete the files that we are importing
+    pending_output_elem = CaptureCurrentFileNumberInPendingOutputs();
+
+    if (status.ok()) {
+      // If crash happen after a hard link established, Recover function may
+      // reuse the file number that has already assigned to the internal file,
+      // and this will overwrite the external file. To protect the external
+      // file, we have to make sure the file number will never being reused.
+      next_file_number =
+          versions_->FetchAddFileNumber(metadata.files.size());
+      auto cf_options = cfd->GetLatestMutableCFOptions();
+      status = versions_->LogAndApply(cfd, *cf_options, &dummy_edit, &mutex_,
+                                      directories_.GetDbDir());
+      if (status.ok()) {
+        InstallSuperVersionAndScheduleWork(cfd, &dummy_sv_ctx, *cf_options);
+      }
+    }
+  }
+  dummy_sv_ctx.Clean();
+
+  if (status.ok()) {
+    SuperVersion* sv = cfd->GetReferencedSuperVersion(&mutex_);
+    status = import_job.Prepare(next_file_number, sv);
+    CleanupSuperVersion(sv);
+  }
+
+  if (status.ok()) {
+    SuperVersionContext sv_context(true /*create_superversion*/);
+    {
+      // Lock db mutex
+      InstrumentedMutexLock l(&mutex_);
+
+      // Stop writes to the DB by entering both write threads
+      WriteThread::Writer w;
+      write_thread_.EnterUnbatched(&w, &mutex_);
+      WriteThread::Writer nonmem_w;
+      if (two_write_queues_) {
+        nonmem_write_thread_.EnterUnbatched(&nonmem_w, &mutex_);
+      }
+
+      num_running_ingest_file_++;
+      assert(!cfd->IsDropped());
+      status = import_job.Run();
+
+      // Install job edit [Mutex will be unlocked here]
+      if (status.ok()) {
+        auto cf_options = cfd->GetLatestMutableCFOptions();
+        status = versions_->LogAndApply(cfd, *cf_options, import_job.edit(),
+                                        &mutex_, directories_.GetDbDir());
+        if (status.ok()) {
+          InstallSuperVersionAndScheduleWork(cfd, &sv_context, *cf_options);
+        }
+      }
+
+      // Resume writes to the DB
+      if (two_write_queues_) {
+        nonmem_write_thread_.ExitUnbatched(&nonmem_w);
+      }
+      write_thread_.ExitUnbatched(&w);
+
+      num_running_ingest_file_--;
+      if (num_running_ingest_file_ == 0) {
+        bg_cv_.SignalAll();
+      }
+    }
+    // mutex_ is unlocked here
+
+    sv_context.Clean();
+  }
+
+  {
+    InstrumentedMutexLock l(&mutex_);
+    ReleaseFileNumberFromPendingOutputs(pending_output_elem);
+  }
+
+  import_job.Cleanup(status);
+  if (!status.ok()) {
+    DropColumnFamily(*handle);
+    DestroyColumnFamilyHandle(*handle);
+    *handle = nullptr;
+  }
+  return status;
+}
+
 Status DBImpl::VerifyChecksum() {
   Status s;
   std::vector<ColumnFamilyData*> cfd_list;

db/db_impl/db_impl.h

@@ -27,6 +27,7 @@
 #include "db/external_sst_file_ingestion_job.h"
 #include "db/flush_job.h"
 #include "db/flush_scheduler.h"
+#include "db/import_column_family_job.h"
 #include "db/internal_stats.h"
 #include "db/log_writer.h"
 #include "db/logs_with_prep_tracker.h"
@@ -324,6 +325,13 @@ class DBImpl : public DB {
   virtual Status IngestExternalFiles(
       const std::vector<IngestExternalFileArg>& args) override;
 
+  using DB::CreateColumnFamilyWithImport;
+  virtual Status CreateColumnFamilyWithImport(
+      const ColumnFamilyOptions& options, const std::string& column_family_name,
+      const ImportColumnFamilyOptions& import_options,
+      const ExportImportFilesMetaData& metadata,
+      ColumnFamilyHandle** handle) override;
+
   virtual Status VerifyChecksum() override;
 
   using DB::StartTrace;
@@ -1783,7 +1791,8 @@ class DBImpl : public DB {
 
   std::string db_absolute_path_;
 
-  // Number of running IngestExternalFile() calls.
+  // Number of running IngestExternalFile() or CreateColumnFamilyWithImport()
+  // calls.
   // REQUIRES: mutex held
   int num_running_ingest_file_;
 

db/db_impl/db_impl_readonly.h

@@ -115,6 +115,16 @@ class DBImplReadOnly : public DBImpl {
     return Status::NotSupported("Not supported operation in read only mode.");
   }
 
+  using DB::CreateColumnFamilyWithImport;
+  virtual Status CreateColumnFamilyWithImport(
+      const ColumnFamilyOptions& /*options*/,
+      const std::string& /*column_family_name*/,
+      const ImportColumnFamilyOptions& /*import_options*/,
+      const ExportImportFilesMetaData& /*metadata*/,
+      ColumnFamilyHandle** /*handle*/) override {
+    return Status::NotSupported("Not supported operation in read only mode.");
+  }
+
  private:
   friend class DB;
 

db/db_test.cc

@@ -2492,6 +2492,16 @@ class ModelDB : public DB {
     return Status::NotSupported("Not implemented");
   }
 
+  using DB::CreateColumnFamilyWithImport;
+  virtual Status CreateColumnFamilyWithImport(
+      const ColumnFamilyOptions& /*options*/,
+      const std::string& /*column_family_name*/,
+      const ImportColumnFamilyOptions& /*import_options*/,
+      const ExportImportFilesMetaData& /*metadata*/,
+      ColumnFamilyHandle** /*handle*/) override {
+    return Status::NotSupported("Not implemented.");
+  }
+
   Status VerifyChecksum() override {
     return Status::NotSupported("Not implemented.");
   }