53 lines
2.1 KiB
C++
53 lines
2.1 KiB
C++
/*
|
|
* Copyright (C) 2018 ScyllaDB
|
|
*/
|
|
|
|
/*
|
|
* This file is part of Scylla.
|
|
*
|
|
* Scylla is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Affero General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* Scylla is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "timestamp.hh"
|
|
|
|
// Stores statistics on all the updates done to a memtable
|
|
// The collected statistics are used for flushing memtable to the disk
|
|
struct encoding_stats {
|
|
|
|
// The fixed epoch corresponds to the one used by Origin - 22/09/2015, 00:00:00, GMT-0:
|
|
// Calendar c = Calendar.getInstance(TimeZone.getTimeZone("GMT-0"), Locale.US);
|
|
// c.set(Calendar.YEAR, 2015);
|
|
// c.set(Calendar.MONTH, Calendar.SEPTEMBER);
|
|
// c.set(Calendar.DAY_OF_MONTH, 22);
|
|
// c.set(Calendar.HOUR_OF_DAY, 0);
|
|
// c.set(Calendar.MINUTE, 0);
|
|
// c.set(Calendar.SECOND, 0);
|
|
// c.set(Calendar.MILLISECOND, 0);
|
|
//
|
|
// long TIMESTAMP_EPOCH = c.getTimeInMillis() * 1000; // timestamps should be in microseconds by convention
|
|
// int DELETION_TIME_EPOCH = (int)(c.getTimeInMillis() / 1000); // local deletion times are in seconds
|
|
// Encoding stats are used for delta-encoding, so we want some default values
|
|
// that are just good enough so we take some recent date in the past
|
|
static constexpr uint32_t deletion_time_epoch = 1442880000;
|
|
static constexpr api::timestamp_type timestamp_epoch = api::timestamp_type(deletion_time_epoch) * 1000 * 1000;
|
|
static constexpr uint32_t ttl_epoch = 0;
|
|
|
|
api::timestamp_type min_timestamp = timestamp_epoch;
|
|
uint32_t min_local_deletion_time = deletion_time_epoch;
|
|
uint32_t min_ttl = ttl_epoch;
|
|
};
|
|
|