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| author | Keith Bostic <keith@wiredtiger.com> | 2013-07-13 14:57:12 -0400 |
|---|---|---|
| committer | Keith Bostic <keith@wiredtiger.com> | 2013-07-13 14:57:12 -0400 |
| commit | 468b5337fa75550fea99ff3f5bcd224552233b5c (patch) | |
| tree | 9eb3cb4b6a4bdd13959e9d1dfd07f506179a1bfe /src/include/btree.h | |
| parent | 9ef654db7852eef6fc3c54fae66caf3c134ce950 (diff) | |
| download | mongo-468b5337fa75550fea99ff3f5bcd224552233b5c.tar.gz | |
Rework the WT_REF structure child page key to support on-page keys for
row-store internal pages by storing an offset/len pair in the same space
we're currently using to store the WT_IKEY reference. Use the bottom
bit of the offset to flag which we're looking at (it's magic and will
only work on little-endian systems, add a run-time test to ensure that
is the case). This commit doesn't actually use that new functionality,
it always instantiates internal page keys in WT_IKEY structures.
Ref #592.
Diffstat (limited to 'src/include/btree.h')
| -rw-r--r-- | src/include/btree.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/src/include/btree.h b/src/include/btree.h index 3ef35562446..83cd1b3b257 100644 --- a/src/include/btree.h +++ b/src/include/btree.h @@ -9,8 +9,10 @@ #define WT_BTREE_MINOR_VERSION 0 /* - * The maximum btree leaf and internal page size is 512MB. (The maximum of - * 512MB is enforced by the software, it could be set as high as 4GB.) + * The maximum btree leaf and internal page size is 512MB (2^29). The maximum + * of 512MB is enforced by the software, it could be set as high as 2GB (2^31). + * (The limit of 31 bits is because we steal a single bit from page offsets in + * the WT_REF structure, see __wt_ref_key.) */ #define WT_BTREE_PAGE_SIZE_MAX (512 * WT_MEGABYTE) |