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Bug #14100254 65389: MVCC IS BROKEN WITH IMPLICIT LOCK

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rb://1088
approved by: Marko Makela

This bug was introduced in early stages of plugin. We were not
checking for an implicit lock on sec index rec for trx_id that is
stamped on current version of the clust_index in case where the
clust_index has a previous delete marked version.
This commit is contained in:
Inaam Rana 2012-05-24 12:37:03 -04:00
parent e979417c06
commit 01748ce128
1 changed files with 0 additions and 12 deletions
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12
storage/innodb_plugin/row/row0vers.c
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@ -208,18 +208,6 @@ row_vers_impl_x_locked_off_kernel(
vers_del = rec_get_deleted_flag(prev_version, comp);
prev_trx_id = row_get_rec_trx_id(prev_version, clust_index,
clust_offsets);
/* If the trx_id and prev_trx_id are different and if
the prev_version is marked deleted then the
prev_trx_id must have already committed for the trx_id
to be able to modify the row. Therefore, prev_trx_id
cannot hold any implicit lock. */
if (vers_del && 0 != ut_dulint_cmp(trx_id, prev_trx_id)) {
mutex_enter(&kernel_mutex);
break;
}
/* The stack of versions is locked by mtr. Thus, it
is safe to fetch the prefixes for externally stored
columns. */