ShowDiskCacheUsageCommand Class Reference

#include <DdlCommandExecutor.h>

Inheritance diagram for ShowDiskCacheUsageCommand:

Collaboration diagram for ShowDiskCacheUsageCommand:

Public Member Functions
	ShowDiskCacheUsageCommand (const DdlCommandData &ddl_data, std::shared_ptr< Catalog_Namespace::SessionInfo const > session_ptr)
ExecutionResult	execute (bool read_only_mode) override
Public Member Functions inherited from DdlCommand
	DdlCommand (const DdlCommandData &ddl_data, std::shared_ptr< Catalog_Namespace::SessionInfo const > session_ptr)

Private Member Functions
std::vector< std::string >	getFilteredTableNames ()

Additional Inherited Members
Protected Attributes inherited from DdlCommand
const DdlCommandData &	ddl_data_
std::shared_ptr < Catalog_Namespace::SessionInfo const >	session_ptr_

Detailed Description

Definition at line 325 of file DdlCommandExecutor.h.

Constructor & Destructor Documentation

ShowDiskCacheUsageCommand::ShowDiskCacheUsageCommand	(	const DdlCommandData &	ddl_data,
		std::shared_ptr< Catalog_Namespace::SessionInfo const >	session_ptr
	)

Definition at line 3356 of file DdlCommandExecutor.cpp.

References CHECK, DdlCommand::ddl_data_, and anonymous_namespace{DdlCommandExecutor.cpp}::extractPayload().

    : DdlCommand(ddl_data, session_ptr) {
  auto& ddl_payload = extractPayload(ddl_data_);
  if (ddl_payload.HasMember("tableNames")) {
    CHECK(ddl_payload["tableNames"].IsArray());
    for (auto const& tablename_def : ddl_payload["tableNames"].GetArray()) {
      CHECK(tablename_def.IsString());
    }
  }
}

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Member Function Documentation

ExecutionResult ShowDiskCacheUsageCommand::execute ( bool  read_only_mode )

overridevirtual

Executes the DDL command corresponding to provided JSON payload.

Parameters

_return

result of DDL command execution (if applicable)

Implements DdlCommand.

Definition at line 3392 of file DdlCommandExecutor.cpp.

References ResultSetLogicalValuesBuilder::create(), anonymous_namespace{DdlCommandExecutor.cpp}::exec_for_tables_which_exist(), anonymous_namespace{DdlCommandExecutor.cpp}::genLiteralBigInt(), genLiteralStr(), legacylockmgr::getExecuteReadLock(), getFilteredTableNames(), kBIGINT, kTEXT, and DdlCommand::session_ptr_.

Referenced by heavydb.cursor.Cursor::executemany().

                                                                      {
  auto execute_read_lock = legacylockmgr::getExecuteReadLock();

  // valid in read_only_mode

  auto cat_ptr = session_ptr_->get_catalog_ptr();
  auto table_names = getFilteredTableNames();

  const auto disk_cache = cat_ptr->getDataMgr().getPersistentStorageMgr()->getDiskCache();
  if (!disk_cache) {
    throw std::runtime_error{"Disk cache not enabled.  Cannot show disk cache usage."};
  }

  // label_infos -> column labels
  std::vector<std::string> labels{"table name", "current cache size"};
  std::vector<TargetMetaInfo> label_infos;
  label_infos.emplace_back(labels[0], SQLTypeInfo(kTEXT, true));
  label_infos.emplace_back(labels[1], SQLTypeInfo(kBIGINT, true));

  std::vector<RelLogicalValues::RowValues> logical_values;

  exec_for_tables_which_exist(
      table_names,
      cat_ptr.get(),
      [&logical_values, &disk_cache, &cat_ptr](const TableDescriptor* td,
                                               const std::string& table_name) {
        auto table_cache_size =
            disk_cache->getSpaceReservedByTable(cat_ptr->getDatabaseId(), td->tableId);
        // logical_values -> table data
        logical_values.emplace_back(RelLogicalValues::RowValues{});
        logical_values.back().emplace_back(genLiteralStr(table_name));
        logical_values.back().emplace_back(genLiteralBigInt(table_cache_size));
      });

  std::shared_ptr<ResultSet> rSet = std::shared_ptr<ResultSet>(
      ResultSetLogicalValuesBuilder::create(label_infos, logical_values));

  return ExecutionResult(rSet, label_infos);
}

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std::vector< std::string > ShowDiskCacheUsageCommand::getFilteredTableNames ( )

private

Definition at line 3369 of file DdlCommandExecutor.cpp.

References DdlCommand::ddl_data_, anonymous_namespace{DdlCommandExecutor.cpp}::extractPayload(), GET_PHYSICAL_TABLES, and DdlCommand::session_ptr_.

Referenced by execute().

                                                                      {
  auto table_names = session_ptr_->get_catalog_ptr()->getTableNamesForUser(
      session_ptr_->get_currentUser(), GET_PHYSICAL_TABLES);

  auto& ddl_payload = extractPayload(ddl_data_);
  if (ddl_payload.HasMember("tableNames")) {
    std::vector<std::string> filtered_names;
    for (const auto& tablename_def : ddl_payload["tableNames"].GetArray()) {
      std::string filter_name = tablename_def.GetString();
      if (std::find(table_names.begin(), table_names.end(), filter_name) !=
          table_names.end()) {
        filtered_names.emplace_back(filter_name);
      } else {
        throw std::runtime_error("Can not show disk cache usage for table: " +
                                 filter_name + ". Table does not exist.");
      }
    }
    return filtered_names;
  } else {
    return table_names;
  }
}

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The documentation for this class was generated from the following files:

• /home/jenkins-slave/workspace/core-os-doxygen/Catalog/DdlCommandExecutor.h
• /home/jenkins-slave/workspace/core-os-doxygen/Catalog/DdlCommandExecutor.cpp