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/*
* mergeManager.h
*
* Copyright 2010-2012 Yahoo! Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Created on: May 19, 2010
* Author: sears
*/
#ifndef MERGEMANAGER_H_
#define MERGEMANAGER_H_
#include <stasis/common.h>
#include <sys/time.h>
#include <stdio.h>
#include <dataTuple.h>
class bLSM;
class mergeStats;
class mergeManager {
public:
static const int UPDATE_PROGRESS_DELTA = 10 * 1024 * 1024;
const double UPDATE_PROGRESS_PERIOD; // in seconds, defined in constructor.
static const int FORCE_INTERVAL = 25 * 1024 * 1024;
static double tv_to_double(struct timeval * tv) {
return (double)tv->tv_sec + ((double)tv->tv_usec)/1000000.0;
}
static double ts_to_double(struct timespec * ts) {
return (double)ts->tv_sec + ((double)ts->tv_nsec)/1000000000.0;
}
static void double_to_ts(struct timespec *ts, double time) {
ts->tv_sec = (time_t)(time);
ts->tv_nsec = (long)((time - (double)ts->tv_sec) * 1000000000.0);
}
uint64_t long_tv(struct timeval& tv) {
return (1000000ULL * (uint64_t)tv.tv_sec) + ((uint64_t)tv.tv_usec);
}
mergeManager(bLSM *ltable);
mergeManager(bLSM *ltable, int xid, recordid rid);
void marshal(int xid, recordid rid);
recordid talloc(int xid);
~mergeManager();
void finished_merge(int merge_level);
void new_merge(int mergelevel);
void set_c0_size(int64_t size);
void update_progress(mergeStats *s, int delta);
double c1_c2_progress_delta();
void tick(mergeStats * s);
mergeStats* get_merge_stats(int mergeLevel);
void read_tuple_from_small_component(int merge_level, dataTuple * tup);
void read_tuple_from_large_component(int merge_level, dataTuple * tup) {
if(tup)
read_tuple_from_large_component(merge_level, 1, tup->byte_length());
}
void read_tuple_from_large_component(int merge_level, int tuple_count, pageid_t byte_len);
void wrote_tuple(int merge_level, dataTuple * tup);
void pretty_print(FILE * out);
void *pretty_print_thread();
void *update_progress_thread();
private:
/**
* How far apart are the c0-c1 and c1-c2 mergers?
*
* This is c1->out_progress - c2->in_progress. We want the downstream merger
* to be slightly ahead of the upstream one so that we can mask latency blips
* due to tearing down the downstream merger and starting the new one.
* Therefore, this should always be slightly negative.
*
* TODO remove c1_c2_delta, which is derived, but difficult (from a synchronization perspective) to compute?
*/
double c1_c2_delta;
/** Helper method for the constructors */
void init_helper(void);
/**
* Serialization format for Stasis merge statistics header.
*
* The small amount of state maintained by mergeManager consists of derived
* and runtime-only fields. This struct reflects that, and only contains
* pointers to marshaled versions of the per-tree component statistics.
*/
struct marshalled_header {
recordid c0; // Probably redundant, but included for symmetry.
recordid c1;
recordid c2;
};
/**
* A pointer to the logtable that we manage statistics for. Most usages of
* this are layering violations; the main exception is in pretty_print.
*
* TODO: remove mergeManager->ltable?
*/
bLSM* ltable;
mergeStats * c0; /// Per-tree component statistics for c0 and c0_mergeable (the latter should always be null...)
mergeStats * c1; /// Per-tree component statistics for c1 and c1_mergeable.
mergeStats * c2; /// Per-tree component statistics for c2.
// The following fields are used to shut down the pretty print thread.
bool still_running;
pthread_cond_t pp_cond;
pthread_t pp_thread;
pthread_cond_t update_progress_cond;
pthread_t update_progress_pthread;
};
#endif /* MERGEMANAGER_H_ */
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