Revision 36fa49ceb5ebf3e6232933c0f13c1551639f6411 authored by Daniel Black on 29 June 2018, 18:42:08 UTC, committed by Facebook Github Bot on 29 June 2018, 18:43:36 UTC
Summary: clang version 7.0.0- (trunk) Target: x86_64-unknown-linux-gnu Thread model: posix InstalledDir: /usr/bin clang++-7 -DROCKSDB_USE_RTTI -g -W -Wextra -Wall -Wsign-compare -Wshadow -Wno-unused-parameter -Werror -I. -I./include -std=c++11 -DROCKSDB_PLATFORM_POSIX -DROCKSDB_LIB_IO_POSIX -DOS_LINUX -fno-builtin-memcmp -DROCKSDB_FALLOCATE_PRESENT -DSNAPPY -DGFLAGS=google -DZLIB -DBZIP2 -DROCKSDB_MALLOC_USABLE_SIZE -DROCKSDB_PTHREAD_ADAPTIVE_MUTEX -DROCKSDB_BACKTRACE -DROCKSDB_RANGESYNC_PRESENT -DROCKSDB_SCHED_GETCPU_PRESENT -Wshorten-64-to-32 -march=native -DHAVE_SSE42 -DROCKSDB_SUPPORT_THREAD_LOCAL -isystem ./third-party/gtest-1.7.0/fused-src -DTRAVIS -O2 -fno-omit-frame-pointer -momit-leaf-frame-pointer -Woverloaded-virtual -Wnon-virtual-dtor -Wno-missing-field-initializers -c utilities/transactions/transaction_test.cc -o utilities/transactions/transaction_test.o utilities/transactions/transaction_test.cc:2282:22: error: unused variable 'txn_options' [-Werror,-Wunused-variable] TransactionOptions txn_options; ^ utilities/transactions/transaction_test.cc:2822:22: error: unused variable 'txn_options' [-Werror,-Wunused-variable] TransactionOptions txn_options; ^ utilities/transactions/transaction_test.cc:2928:22: error: unused variable 'txn_options' [-Werror,-Wunused-variable] TransactionOptions txn_options; ^ utilities/transactions/transaction_test.cc:3109:22: error: unused variable 'txn_options' [-Werror,-Wunused-variable] TransactionOptions txn_options; ^ utilities/transactions/transaction_test.cc:4364:22: error: unused variable 'txn_options' [-Werror,-Wunused-variable] TransactionOptions txn_options; ^ Closes https://github.com/facebook/rocksdb/pull/4074 Differential Revision: D8698051 Pulled By: ajkr fbshipit-source-id: 6255618eefdd189962fbea1b02cf1eb5ae501274
1 parent 2462763
c_simple_example.c
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include "rocksdb/c.h"
#include <unistd.h> // sysconf() - get CPU count
const char DBPath[] = "/tmp/rocksdb_simple_example";
const char DBBackupPath[] = "/tmp/rocksdb_simple_example_backup";
int main(int argc, char **argv) {
rocksdb_t *db;
rocksdb_backup_engine_t *be;
rocksdb_options_t *options = rocksdb_options_create();
// Optimize RocksDB. This is the easiest way to
// get RocksDB to perform well
long cpus = sysconf(_SC_NPROCESSORS_ONLN); // get # of online cores
rocksdb_options_increase_parallelism(options, (int)(cpus));
rocksdb_options_optimize_level_style_compaction(options, 0);
// create the DB if it's not already present
rocksdb_options_set_create_if_missing(options, 1);
// open DB
char *err = NULL;
db = rocksdb_open(options, DBPath, &err);
assert(!err);
// open Backup Engine that we will use for backing up our database
be = rocksdb_backup_engine_open(options, DBBackupPath, &err);
assert(!err);
// Put key-value
rocksdb_writeoptions_t *writeoptions = rocksdb_writeoptions_create();
const char key[] = "key";
const char *value = "value";
rocksdb_put(db, writeoptions, key, strlen(key), value, strlen(value) + 1,
&err);
assert(!err);
// Get value
rocksdb_readoptions_t *readoptions = rocksdb_readoptions_create();
size_t len;
char *returned_value =
rocksdb_get(db, readoptions, key, strlen(key), &len, &err);
assert(!err);
assert(strcmp(returned_value, "value") == 0);
free(returned_value);
// create new backup in a directory specified by DBBackupPath
rocksdb_backup_engine_create_new_backup(be, db, &err);
assert(!err);
rocksdb_close(db);
// If something is wrong, you might want to restore data from last backup
rocksdb_restore_options_t *restore_options = rocksdb_restore_options_create();
rocksdb_backup_engine_restore_db_from_latest_backup(be, DBPath, DBPath,
restore_options, &err);
assert(!err);
rocksdb_restore_options_destroy(restore_options);
db = rocksdb_open(options, DBPath, &err);
assert(!err);
// cleanup
rocksdb_writeoptions_destroy(writeoptions);
rocksdb_readoptions_destroy(readoptions);
rocksdb_options_destroy(options);
rocksdb_backup_engine_close(be);
rocksdb_close(db);
return 0;
}
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