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Commit 92022f03 authored by Zardosht Kasheff's avatar Zardosht Kasheff Committed by Yoni Fogel
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addresses #901 

make handlerton not use a cursor that has had a failed operation
this will be useful for lightweight cursors

git-svn-id: file:///svn/mysql/tokudb-engine/src@4455 c7de825b-a66e-492c-adef-691d508d4ae1
parent a939fc8b
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Showing with 60 additions and 6 deletions
storage/tokudb/ha_tokudb.cc
View file @ 92022f03
......@@ -686,13 +686,20 @@ static void make_name(char *newname, const char *tablename, const char *dictname
}
#define CHECK_VALID_CURSOR() \
if (cursor == NULL) { \
error = last_cursor_error; \
goto cleanup; \
}
ha_tokudb::ha_tokudb(handlerton * hton, TABLE_SHARE * table_arg)
:
handler(hton, table_arg), alloc_ptr(0), rec_buff(0),
// flags defined in sql\handler.h
int_table_flags(HA_REC_NOT_IN_SEQ | HA_FAST_KEY_READ | HA_NULL_IN_KEY | HA_CAN_INDEX_BLOBS | HA_PRIMARY_KEY_IN_READ_INDEX |
HA_FILE_BASED | HA_CAN_GEOMETRY | HA_AUTO_PART_KEY | HA_TABLE_SCAN_ON_INDEX),
changed_rows(0), last_dup_key((uint) - 1), version(0), using_ignore(0),primary_key_offsets(NULL) {
changed_rows(0), last_dup_key((uint) - 1), version(0), using_ignore(0), last_cursor_error(0),primary_key_offsets(NULL) {
}
static const char *ha_tokudb_exts[] = {
......@@ -2215,10 +2222,13 @@ int ha_tokudb::index_init(uint keynr, bool sorted) {
cursor->c_close(cursor);
}
active_index = keynr;
last_cursor_error = 0;
DBUG_ASSERT(keynr <= table->s->keys);
DBUG_ASSERT(share->key_file[keynr]);
if ((error = share->key_file[keynr]->cursor(share->key_file[keynr], transaction, &cursor, table->reginfo.lock_type > TL_WRITE_ALLOW_READ ? 0 : 0)))
if ((error = share->key_file[keynr]->cursor(share->key_file[keynr], transaction, &cursor, table->reginfo.lock_type > TL_WRITE_ALLOW_READ ? 0 : 0))) {
last_cursor_error = error;
cursor = NULL; // Safety
}
bzero((void *) &last_key, sizeof(last_key));
TOKUDB_DBUG_RETURN(error);
}
......@@ -2233,6 +2243,7 @@ int ha_tokudb::index_end() {
DBUG_PRINT("enter", ("table: '%s'", table_share->table_name.str));
error = cursor->c_close(cursor);
cursor = NULL;
last_cursor_error = 0;
}
active_index = MAX_KEY;
TOKUDB_DBUG_RETURN(error);
......@@ -2260,9 +2271,16 @@ int ha_tokudb::read_row(int error, uchar * buf, uint keynr, DBT * row, DBT * fou
// Disreputable error translation: this makes us all puke
//
if (error) {
if (error == DB_NOTFOUND || error == DB_KEYEMPTY)
error = read_next ? HA_ERR_END_OF_FILE : HA_ERR_KEY_NOT_FOUND;
last_cursor_error = error;
table->status = STATUS_NOT_FOUND;
cursor->c_close(cursor);
cursor = NULL;
if (error == DB_NOTFOUND || error == DB_KEYEMPTY) {
error = read_next ? HA_ERR_END_OF_FILE : HA_ERR_KEY_NOT_FOUND;
if ((share->key_file[keynr]->cursor(share->key_file[keynr], transaction, &cursor, table->reginfo.lock_type > TL_WRITE_ALLOW_READ ? 0 : 0))) {
cursor = NULL; // Safety
}
}
TOKUDB_DBUG_RETURN(error);
}
//
......@@ -2433,6 +2451,8 @@ int ha_tokudb::index_read(uchar * buf, const uchar * key, uint key_len, enum ha_
DBT row;
int error;
CHECK_VALID_CURSOR();
table->in_use->status_var.ha_read_key_count++;
bzero((void *) &row, sizeof(row));
pack_key(&last_key, active_index, key_buff, key, key_len);
......@@ -2510,6 +2530,7 @@ int ha_tokudb::index_read(uchar * buf, const uchar * key, uint key_len, enum ha_
error = read_row(error, buf, active_index, &row, &last_key, 0);
if (error && (tokudb_debug & TOKUDB_DEBUG_ERROR))
TOKUDB_TRACE("error:%d:%d\n", error, find_flag);
cleanup:
TOKUDB_DBUG_RETURN(error);
}
......@@ -2555,9 +2576,12 @@ int ha_tokudb::index_next(uchar * buf) {
TOKUDB_DBUG_ENTER("ha_tokudb::index_next");
int error;
DBT row;
CHECK_VALID_CURSOR();
statistic_increment(table->in_use->status_var.ha_read_next_count, &LOCK_status);
bzero((void *) &row, sizeof(row));
error = read_row(cursor->c_get(cursor, &last_key, &row, DB_NEXT), buf, active_index, &row, &last_key, 1);
cleanup:
TOKUDB_DBUG_RETURN(error);
}
......@@ -2576,6 +2600,8 @@ int ha_tokudb::index_next_same(uchar * buf, const uchar * key, uint keylen) {
TOKUDB_DBUG_ENTER("ha_tokudb::index_next_same %p", this);
DBT row;
int error;
CHECK_VALID_CURSOR();
statistic_increment(table->in_use->status_var.ha_read_next_count, &LOCK_status);
bzero((void *) &row, sizeof(row));
/* QQQ NEXT_DUP on nodup returns EINVAL for tokudb */
......@@ -2590,6 +2616,7 @@ int ha_tokudb::index_next_same(uchar * buf, const uchar * key, uint keylen) {
if (!error &&::key_cmp_if_same(table, key, active_index, keylen))
error = HA_ERR_END_OF_FILE;
}
cleanup:
TOKUDB_DBUG_RETURN(error);
}
......@@ -2605,10 +2632,12 @@ int ha_tokudb::index_next_same(uchar * buf, const uchar * key, uint keylen) {
int ha_tokudb::index_prev(uchar * buf) {
TOKUDB_DBUG_ENTER("ha_tokudb::index_prev");
int error;
CHECK_VALID_CURSOR();
DBT row;
statistic_increment(table->in_use->status_var.ha_read_prev_count, &LOCK_status);
bzero((void *) &row, sizeof(row));
error = read_row(cursor->c_get(cursor, &last_key, &row, DB_PREV), buf, active_index, &row, &last_key, 1);
cleanup:
TOKUDB_DBUG_RETURN(error);
}
......@@ -2625,9 +2654,11 @@ int ha_tokudb::index_first(uchar * buf) {
TOKUDB_DBUG_ENTER("ha_tokudb::index_first");
int error;
DBT row;
CHECK_VALID_CURSOR();
statistic_increment(table->in_use->status_var.ha_read_first_count, &LOCK_status);
bzero((void *) &row, sizeof(row));
error = read_row(cursor->c_get(cursor, &last_key, &row, DB_FIRST), buf, active_index, &row, &last_key, 1);
cleanup:
TOKUDB_DBUG_RETURN(error);
}
......@@ -2644,9 +2675,11 @@ int ha_tokudb::index_last(uchar * buf) {
TOKUDB_DBUG_ENTER("ha_tokudb::index_last");
int error;
DBT row;
CHECK_VALID_CURSOR();
statistic_increment(table->in_use->status_var.ha_read_last_count, &LOCK_status);
bzero((void *) &row, sizeof(row));
error = read_row(cursor->c_get(cursor, &last_key, &row, DB_LAST), buf, active_index, &row, &last_key, 1);
cleanup:
TOKUDB_DBUG_RETURN(error);
}
......@@ -2665,7 +2698,7 @@ int ha_tokudb::rnd_init(bool scan) {
if (scan) {
DB* db = share->key_file[primary_key];
error = db->pre_acquire_read_lock(db, transaction, db->dbt_neg_infty(), NULL, db->dbt_pos_infty(), NULL);
if (error) { goto cleanup; }
if (error) { last_cursor_error = error; goto cleanup; }
}
error = index_init(primary_key, 0);
cleanup:
......@@ -2693,6 +2726,8 @@ int ha_tokudb::rnd_next(uchar * buf) {
TOKUDB_DBUG_ENTER("ha_tokudb::ha_tokudb::rnd_next");
int error;
DBT row;
CHECK_VALID_CURSOR()
//
// The reason we do not just call index_next is that index_next
// increments a different variable than we do here
......@@ -2701,6 +2736,7 @@ int ha_tokudb::rnd_next(uchar * buf) {
bzero((void *) &row, sizeof(row));
DBUG_DUMP("last_key", (uchar *) last_key.data, last_key.size);
error = read_row(cursor->c_get(cursor, &last_key, &row, DB_NEXT), buf, primary_key, &row, &last_key, 1);
cleanup:
TOKUDB_DBUG_RETURN(error);
}
......@@ -2802,7 +2838,17 @@ int ha_tokudb::read_range_first(
end_key ? &end_dbt_key : share->key_file[active_index]->dbt_pos_infty(),
end_dbt_data
);
if (error){ goto cleanup; }
if (error){
last_cursor_error = error;
//
// cursor should be initialized here, but in case it is not, we still check
//
if (cursor) {
cursor->c_close(cursor);
cursor = NULL;
}
goto cleanup;
}
error = handler::read_range_first(start_key, end_key, eq_range, sorted);
......
storage/tokudb/ha_tokudb.h
View file @ 92022f03
......@@ -116,7 +116,15 @@ private:
uint version;
bool key_read, using_ignore;
//
// After a cursor encounters an error, the cursor will be unusable
// In case MySQL attempts to do a cursor operation (such as rnd_next
// or index_prev), we will gracefully return this error instead of crashing
//
int last_cursor_error;
PRIM_KEY_PART_INFO* primary_key_offsets;
bool fix_rec_buff_for_blob(ulong length);
#define TOKUDB_HIDDEN_PRIMARY_KEY_LENGTH 5 // QQQ why 5?
uchar current_ident[TOKUDB_HIDDEN_PRIMARY_KEY_LENGTH];
......
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