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authorSergei Golubchik <sergii@pisem.net>2013-04-15 15:09:22 +0200
committerSergei Golubchik <sergii@pisem.net>2013-04-15 15:09:22 +0200
commita9035be5b7a7b3865ddb4ef34a5d0cfc65dfc254 (patch)
treea9df7341e91623f62fe37cd47fce139d8888fc95 /storage/innobase/trx/trx0rec.cc
parent3a1c91d87d69ef243b3e78be6089102cafef0a8e (diff)
parentf57ecb7786177e0af3b1e3ec94302720b2e0f967 (diff)
downloadmariadb-git-a9035be5b7a7b3865ddb4ef34a5d0cfc65dfc254.tar.gz
10.0-base merge
Diffstat (limited to 'storage/innobase/trx/trx0rec.cc')
-rw-r--r--storage/innobase/trx/trx0rec.cc19
1 files changed, 19 insertions, 0 deletions
diff --git a/storage/innobase/trx/trx0rec.cc b/storage/innobase/trx/trx0rec.cc
index b87eac9362e..203139f23fd 100644
--- a/storage/innobase/trx/trx0rec.cc
+++ b/storage/innobase/trx/trx0rec.cc
@@ -1588,6 +1588,25 @@ trx_undo_prev_version_build(
if (row_upd_changes_field_size_or_external(index, offsets, update)) {
ulint n_ext;
+ /* We should confirm the existence of disowned external data,
+ if the previous version record is delete marked. If the trx_id
+ of the previous record is seen by purge view, we should treat
+ it as missing history, because the disowned external data
+ might be purged already.
+
+ The inherited external data (BLOBs) can be freed (purged)
+ after trx_id was committed, provided that no view was started
+ before trx_id. If the purge view can see the committed
+ delete-marked record by trx_id, no transactions need to access
+ the BLOB. */
+
+ if ((update->info_bits & REC_INFO_DELETED_FLAG)
+ && read_view_sees_trx_id(purge_sys->view, trx_id)) {
+ /* treat as a fresh insert, not to
+ cause assertion error at the caller. */
+ return(DB_SUCCESS);
+ }
+
/* We have to set the appropriate extern storage bits in the
old version of the record: the extern bits in rec for those
fields that update does NOT update, as well as the bits for