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| author | Keith Bostic <keith@wiredtiger.com> | 2014-04-10 10:41:11 -0400 |
|---|---|---|
| committer | Keith Bostic <keith@wiredtiger.com> | 2014-04-10 10:41:11 -0400 |
| commit | 6e87148a093dc8c749219bf02ec004f1b2e5ce11 (patch) | |
| tree | 512faad3750452f7eca4710624ba563941bbbfc4 /src/btree | |
| parent | 7980b479e7a034ff9ac7d112c47d7e9ac0e6be32 (diff) | |
| download | mongo-6e87148a093dc8c749219bf02ec004f1b2e5ce11.tar.gz | |
Add another comment, about "deleted" pages that came about through eviction.
Diffstat (limited to 'src/btree')
| -rw-r--r-- | src/btree/bt_delete.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/btree/bt_delete.c b/src/btree/bt_delete.c index 2b87f41c71d..ae184ec4de4 100644 --- a/src/btree/bt_delete.c +++ b/src/btree/bt_delete.c @@ -46,6 +46,13 @@ * stored in the WT_REF.page_del field, with the transaction ID, that way the * session unrolling the delete can find all of the WT_UPDATE structures that * require update. + * + * One final note: pages can also be marked deleted if emptied and evicted. In + * that case, the WT_REF state will be set to WT_REF_DELETED but there will not + * be any associated WT_REF.page_del field. These pages are always skipped + * during cursor traversal (the page could not have been evicted if there were + * updates that weren't globally visible), and if read is forced to instantiate + * such a page, it simply creates an empty page from scratch. */ /* |