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feat(lsm): implement updating entries
ci/woodpecker/push/build Pipeline was successful Details

Jef Roosens 2024-08-28 20:29:47 +02:00
parent 3dce25239b
commit 79c3158974
Signed by: Jef Roosens
GPG Key ID: B75D4F293C7052DB
2 changed files with 31 additions and 8 deletions
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34
lsm/src/store/lsm_store_disk_write.c
View File

@ -1,3 +1,5 @@
#include <stdint.h>
#include "lsm/store_internal.h"
static lsm_error lsm_fwrite(uint64_t *sum, FILE *f, uint64_t size,
@ -125,16 +127,10 @@ lsm_error lsm_entry_disk_insert(lsm_entry_handle *handle) {
return res;
}
// Marking an entry as removed in the idx file is simply setting the length of
// its entry to zero
lsm_error lsm_entry_disk_remove(lsm_entry_handle *handle) {
lsm_store *store = handle->store;
const lsm_entry *entry = handle->wrapper->entry;
static lsm_error lsm_idx_zero_block(lsm_store *store, uint64_t pos) {
pthread_mutex_lock(&store->idx.lock);
lsm_error res =
lsm_fseek(store->idx.f, entry->idx_file_offset + sizeof(uint64_t));
lsm_error res = lsm_fseek(store->idx.f, pos);
if (res != lsm_error_ok) {
pthread_mutex_unlock(&store->idx.lock);
@ -153,7 +149,29 @@ lsm_error lsm_entry_disk_remove(lsm_entry_handle *handle) {
fflush(store->idx.f);
return lsm_error_ok;
}
// Marking an entry as removed in the idx file is simply setting the length of
// its entry to zero
lsm_error lsm_entry_disk_remove(lsm_entry_handle *handle) {
const lsm_entry *entry = handle->wrapper->entry;
LSM_RES(lsm_idx_zero_block(handle->store,
entry->idx_file_offset * sizeof(uint64_t)));
LSM_RES(lsm_entry_data_remove(handle));
return lsm_error_ok;
}
lsm_error lsm_entry_disk_update(lsm_entry_handle *handle) {
// An update is implemented by reinserting the entry at the end of the db file
uint64_t old_idx_index = handle->wrapper->entry->idx_file_offset;
// TODO is there any way we can make this atomic? If the zero write to the
// index file fails, there are two entries in the db file for the same key.
LSM_RES(lsm_entry_disk_insert(handle));
LSM_RES(lsm_idx_zero_block(handle->store, old_idx_index * sizeof(uint64_t)));
return lsm_error_ok;
}

5
lsm/src/store/lsm_store_entry.c
View File

@ -61,6 +61,7 @@ lsm_error lsm_entry_handle_init(lsm_entry_handle **out) {
lsm_error lsm_entry_commit(lsm_entry_handle *handle) {
uint8_t state_new = handle->states & lsm_entry_handle_state_new;
uint8_t state_removed = handle->states & lsm_entry_handle_state_removed;
uint8_t state_updated = handle->states & lsm_entry_handle_state_updated;
// Clean new entry
if (state_new && !state_removed) {
@ -73,6 +74,8 @@ lsm_error lsm_entry_commit(lsm_entry_handle *handle) {
lsm_entry_free(handle->wrapper->entry);
handle->wrapper->entry = NULL;
} else if (state_updated && !(state_new || state_removed)) {
LSM_RES(lsm_entry_disk_update(handle));
}
// Reset states after committing current changes
@ -99,6 +102,8 @@ void lsm_entry_close(lsm_entry_handle *handle) {
handle->wrapper->entry = NULL;
}
// TODO rollback uncomitted updates
pthread_rwlock_unlock(&handle->wrapper->lock);
free(handle);
}