diff options
Diffstat (limited to 'src/third_party/wiredtiger/src/btree/bt_page.c')
| -rw-r--r-- | src/third_party/wiredtiger/src/btree/bt_page.c | 60 |
1 files changed, 25 insertions, 35 deletions
diff --git a/src/third_party/wiredtiger/src/btree/bt_page.c b/src/third_party/wiredtiger/src/btree/bt_page.c index 407fbca7839..0db3e5216d2 100644 --- a/src/third_party/wiredtiger/src/btree/bt_page.c +++ b/src/third_party/wiredtiger/src/btree/bt_page.c @@ -148,14 +148,12 @@ __wt_page_inmem(WT_SESSION_IMPL *session, WT_REF *ref, const void *image, uint32 case WT_PAGE_COL_INT: case WT_PAGE_COL_VAR: /* - * Column-store leaf page entries map one-to-one to the number - * of physical entries on the page (each physical entry is a - * value item). Note this value isn't necessarily correct, we + * Column-store leaf page entries map one-to-one to the number of physical entries on the + * page (each physical entry is a value item). Note this value isn't necessarily correct, we * may skip values when reading the disk image. * - * Column-store internal page entries map one-to-one to the - * number of physical entries on the page (each entry is a - * location cookie). + * Column-store internal page entries map one-to-one to the number of physical entries on + * the page (each entry is a location cookie). */ alloc_entries = dsk->u.entries; break; @@ -191,14 +189,12 @@ __wt_page_inmem(WT_SESSION_IMPL *session, WT_REF *ref, const void *image, uint32 F_SET_ATOMIC(page, flags); /* - * Track the memory allocated to build this page so we can update the - * cache statistics in a single call. If the disk image is in allocated - * memory, start with that. + * Track the memory allocated to build this page so we can update the cache statistics in a + * single call. If the disk image is in allocated memory, start with that. * - * Accounting is based on the page-header's in-memory disk size instead - * of the buffer memory used to instantiate the page image even though - * the values might not match exactly, because that's the only value we - * have when discarding the page image and accounting needs to match. + * Accounting is based on the page-header's in-memory disk size instead of the buffer memory + * used to instantiate the page image even though the values might not match exactly, because + * that's the only value we have when discarding the page image and accounting needs to match. */ size = LF_ISSET(WT_PAGE_DISK_ALLOC) ? dsk->mem_size : 0; @@ -454,21 +450,16 @@ __inmem_row_int(WT_SESSION_IMPL *session, WT_PAGE *page, size_t *sizep) break; case WT_CELL_ADDR_DEL: /* - * A cell may reference a deleted leaf page: if a leaf - * page was deleted without being read (fast truncate), - * and the deletion committed, but older transactions - * in the system required the previous version of the - * page to remain available, a special deleted-address - * type cell is written. We'll see that cell on a page - * if we read from a checkpoint including a deleted - * cell or if we crash/recover and start off from such - * a checkpoint (absent running recovery, a version of - * the page without the deleted cell would eventually - * have been written). If we crash and recover to a - * page with a deleted-address cell, we want to discard - * the page from the backing store (it was never - * discarded), and, of course, by definition no earlier - * transaction will ever need it. + * A cell may reference a deleted leaf page: if a leaf page was deleted without being + * read (fast truncate), and the deletion committed, but older transactions in the + * system required the previous version of the page to remain available, a special + * deleted-address type cell is written. We'll see that cell on a page if we read from a + * checkpoint including a deleted cell or if we crash/recover and start off from such a + * checkpoint (absent running recovery, a version of the page without the deleted cell + * would eventually have been written). If we crash and recover to a page with a + * deleted-address cell, we want to discard the page from the backing store (it was + * never discarded), and, of course, by definition no earlier transaction will ever need + * it. * * Re-create the state of a deleted page. */ @@ -524,15 +515,14 @@ __inmem_row_leaf_entries(WT_SESSION_IMPL *session, const WT_PAGE_HEADER *dsk, ui btree = S2BT(session); /* - * Leaf row-store page entries map to a maximum of one-to-one to the - * number of physical entries on the page (each physical entry might be - * a key without a subsequent data item). To avoid over-allocation in - * workloads without empty data items, first walk the page counting the + * Leaf row-store page entries map to a maximum of one-to-one to the number of physical entries + * on the page (each physical entry might be a key without a subsequent data item). To avoid + * over-allocation in workloads without empty data items, first walk the page counting the * number of keys, then allocate the indices. * - * The page contains key/data pairs. Keys are on-page (WT_CELL_KEY) or - * overflow (WT_CELL_KEY_OVFL) items, data are either non-existent or a - * single on-page (WT_CELL_VALUE) or overflow (WT_CELL_VALUE_OVFL) item. + * The page contains key/data pairs. Keys are on-page (WT_CELL_KEY) or overflow + * (WT_CELL_KEY_OVFL) items, data are either non-existent or a single on-page (WT_CELL_VALUE) or + * overflow (WT_CELL_VALUE_OVFL) item. */ nindx = 0; WT_CELL_FOREACH_BEGIN (session, btree, dsk, unpack) { |