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[C-API] added the possiblity to create a HashSkipList or HashLinkedList to support prefix seeks

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This commit is contained in:
Thomas Adam 2014-03-31 08:28:06 +02:00
parent a73383e8ac
commit 38dc5ef45f
3 changed files with 68 additions and 0 deletions
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20
db/c.cc
View File

@ -983,6 +983,26 @@ void rocksdb_options_set_memtable_prefix_bloom_probes(
opt->rep.memtable_prefix_bloom_probes = v;
}
void rocksdb_options_set_hash_skip_list_rep(
rocksdb_options_t *opt, size_t bucket_count,
int32_t skiplist_height, int32_t skiplist_branching_factor) {
static rocksdb::MemTableRepFactory* factory = 0;
if (!factory) {
factory = rocksdb::NewHashSkipListRepFactory(
bucket_count, skiplist_height, skiplist_branching_factor);
}
opt->rep.memtable_factory.reset(factory);
}
void rocksdb_options_set_hash_link_list_rep(
rocksdb_options_t *opt, size_t bucket_count) {
static rocksdb::MemTableRepFactory* factory = 0;
if (!factory) {
factory = rocksdb::NewHashLinkListRepFactory(bucket_count);
}
opt->rep.memtable_factory.reset(factory);
}
void rocksdb_options_set_max_successive_merges(
rocksdb_options_t* opt, size_t v) {
opt->rep.max_successive_merges = v;

46
db/c_test.c
View File

@ -433,6 +433,52 @@ int main(int argc, char** argv) {
}
StartPhase("prefix");
{
// Create new database
rocksdb_close(db);
rocksdb_destroy_db(options, dbname, &err);
rocksdb_options_set_filter_policy(options, rocksdb_filterpolicy_create_bloom(10));
rocksdb_options_set_prefix_extractor(options, rocksdb_slicetransform_create_fixed_prefix(3));
rocksdb_options_set_hash_skip_list_rep(options, 50000, 4, 4);
db = rocksdb_open(options, dbname, &err);
CheckNoError(err);
rocksdb_put(db, woptions, "foo1", 4, "foo", 3, &err);
CheckNoError(err);
rocksdb_put(db, woptions, "foo2", 4, "foo", 3, &err);
CheckNoError(err);
rocksdb_put(db, woptions, "foo3", 4, "foo", 3, &err);
CheckNoError(err);
rocksdb_put(db, woptions, "bar1", 4, "bar", 3, &err);
CheckNoError(err);
rocksdb_put(db, woptions, "bar2", 4, "bar", 3, &err);
CheckNoError(err);
rocksdb_put(db, woptions, "bar3", 4, "bar", 3, &err);
CheckNoError(err);
rocksdb_readoptions_set_prefix_seek(roptions, 1);
rocksdb_iterator_t* iter = rocksdb_create_iterator(db, roptions);
CheckCondition(!rocksdb_iter_valid(iter));
rocksdb_iter_seek(iter, "bar", 3);
rocksdb_iter_get_error(iter, &err);
CheckNoError(err);
CheckCondition(rocksdb_iter_valid(iter));
CheckIter(iter, "bar1", "bar");
rocksdb_iter_next(iter);
CheckIter(iter, "bar2", "bar");
rocksdb_iter_next(iter);
CheckIter(iter, "bar3", "bar");
rocksdb_iter_get_error(iter, &err);
CheckNoError(err);
rocksdb_iter_destroy(iter);
}
StartPhase("cleanup");
rocksdb_close(db);
rocksdb_options_destroy(options);

2
include/rocksdb/c.h
View File

@ -346,6 +346,8 @@ extern void rocksdb_options_set_delete_obsolete_files_period_micros(
extern void rocksdb_options_set_source_compaction_factor(rocksdb_options_t*, int);
extern void rocksdb_options_prepare_for_bulk_load(rocksdb_options_t*);
extern void rocksdb_options_set_memtable_vector_rep(rocksdb_options_t*);
extern void rocksdb_options_set_hash_skip_list_rep(rocksdb_options_t*, size_t, int32_t, int32_t);
extern void rocksdb_options_set_hash_link_list_rep(rocksdb_options_t*, size_t);
extern void rocksdb_options_set_max_bytes_for_level_base(rocksdb_options_t* opt, uint64_t n);
extern void rocksdb_options_set_stats_dump_period_sec(rocksdb_options_t* opt, unsigned int sec);