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authorMichael Cahill <michael.cahill@wiredtiger.com>2012-09-17 17:15:21 +1000
committerMichael Cahill <michael.cahill@wiredtiger.com>2012-09-17 17:15:21 +1000
commitfd97c9944fc9578d219b14e893756c94b5dd3a1e (patch)
treeac3e3a08d512daeb7cb9b4151ce3364b7b3a4992 /NEWS
parentf419407454a1e8d423ee705ad50262e2c23e4a60 (diff)
downloadmongo-fd97c9944fc9578d219b14e893756c94b5dd3a1e.tar.gz
Cut release 1.3.0.1.3.0
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+WiredTiger release 1.3.0, 2012-09-17
+------------------------------------
+
+This release contains a number of major new features, including:
+
+* support for LSM trees with Bloom filters;
+* support for hot backups; and
+* support for fast truncation of files.
+
+In addition, there are some critical bug fixes. We recommend that all users
+upgrade. Here is the full list of changes:
+
+[#143] Implement random record lookups.
+
+[#168] Add support for LSM trees.
+
+[#168] Add support for Bloom filters in LSM trees.
+
+[#198] Handle page-generation wraparound.
+
+[#236] Implement hot backups.
+
+[#244] Index cursors for column-store objects may not be created using the
+ record number as the index key.
+
+[#247] Add a fast-path for WT_SESSION::truncate that avoids reading most
+ data to be deleted.
+
+[#259] Performance hack for cursor open: don't parse the configuration
+ strings for a default value if the application didn't specify a
+ configuration string.
+
+[#262] Disable dump on child cursors: only the top-level cursor is wrapped
+ in a dump cursor.
+
+[#266] Deal with new / dropped indices in __wt_schema_open_index.
+
+[#269] Checkpoint handles must not be open when they are overwritten.
+
+[#271] Add support for a reserved checkpoint name "WiredTigerCheckpoint"
+ that opens the object's last checkpoint.
+
+[#271] Add the ability to access unnamed checkpoints.
+
+[#274] Change cursor.equals to return a standard error value and store the
+ cursor equality result in a separate argument.
+
+[#275] If exclusive handle is required for an operation and it is not
+ available, fail immediately: don't block.
+
+[#276] Fix methods that return integer parameters from Python. This
+ includes cursor.equals and cursor.search_near.
+
+[#277] Acquire the schema lock when creating the metadata file. We're
+ single-threaded, so it isn't protecting against anything, but the
+ handle management code expects to have the schema lock.
+
+[#279] Some optimizations for __wt_config_gets_defno. Specifically, if
+ we're dealing with a simple stack of config strings, just parse the
+ application string rather than the full list of defaults.
+
+[#279] Split the description string into a set of structures, to reduce the
+ number of string comparisons and manipulation that's required.
+
+[#282] Remove the cursor.reconfigure method, and replace it with
+ documentation showing how to "reconfigure" cursors using the
+ session.open_cursor method to duplicate them with different
+ configuration strings.
+
+[#284] Fix for a hazard reference race, where page eviction races with the
+ creation of the hazard reference, we have to check the pointer
+ itself as well as the state of the pointer.
+
+[#285] We can clear the tree's modified flag on checkpoint, as long as the
+ checkpoint writes all modifications. Clear the tree's modified
+ flag before we start the checkpoint, but reset it as necessary if
+ reconciliation is unable to write all of the changes in a page.
+
+[#287] Fix __wt_config_check to handle overlapping config values correctly.
+
+[#289] Add support for read-committed isolation, make it the default. Add
+ a session-level "isolation" setting.
+
+[#294] If txn_commit fails, document the transaction was rolled-back.
+
+[#295] Expand the documentation on using cursors without explicit
+ transactions.
+
+[#300] Include all changes whenever closing a file, don't check for
+ visibility. If updates are skipped while evicting a page, give up.
+
+[#305] Have "wt dump" fail more gracefully if the object doesn't exist.
+
+[#310] When freeing a tracked address in reconcilation, clear it to avoid
+ freeing the same address again on error.
+
+[#314] Replace cursor.equals with cursor.compare
+
+[#319] Clear the bulk_load_ok flag when closing handles.
+
+
+* Add an "ancient transaction" statistic so we can find out if they're
+ actually occurring in the field.
+
+* Add an "was object ever modified" flag to the btree handle, and use it to
+ avoid writing read-only objects during internal checkpoints, issue
+
+* Add per-connection statistics counters for transaction checkpoint, begin,
+ commit and rollback. Add per-btree statistics counters for update
+ conflicts.
+
+* Another fixed-length column-store implicit record fix: if the earliest
+ row in the object is row 10, and it's on an append list, we still must
+ return rows 1-9, they've been implicitly created.
+
+* Bulk cursors: disallow cursor.{equals,next,prev,reset,search,
+ search_near,update,remove}; only close and insert are supported.
+
+* Change session.truncate to support any cursor position for range
+ truncation, not just keys that are known to exist.
+
+* Checkpoint has to flush the metadata file, but only after it's flushed
+ all of the other files.
+
+* Discard obsolete WT_UPDATE structures during updates.
+
+* Document that duplicated cursors are positioned at the same point as the
+ cursor that was duplicated.
+
+* Fix a (very unlikely) deadlock at startup, if an application issues a
+ checkpoint before the eviction server has managed to open its sesssion.
+
+* Fix a core dump if we verify a file that's corrupted such that we are
+ unable to load any checkpoints at all, and the per-checkpoint bit map is
+ never set.
+
+* If a page selected for eviction cannot be freed because it has some
+ recent updates, try instead to free memory by trimming old updates.
+
+* If a thread fails to evict a page, try to bump its snapshot. This avoids
+ the common case of read-committed threads getting stuck because one
+ thread falls behind (e.g., because we can't evict during a checkpoint).
+
+* If an exclusive table create fails, return EEXIST.
+
+* If we try to remove a file that doesn't exist, don't complain, return
+ success.
+
+* If we're repeatedly taking a checkpoint with the same name, skip the work
+ for read-only objects.
+
+* Instead of flagging the empty tree's leaf page empty as part of creating
+ an empty tree in memory, set the page as modified (to force
+ reconciliation); if the leaf page is still empty at that time, then we'll
+ figure it out during that reconciliation. This fixes a memory leak where
+ the leaf page of a empty tree wasn't being freed.
+
+* It's not unreasonable to open a cursor on a non-existent table, don't
+ complain, just return not-found.
+
+* Move dist/RELEASE to the top level of the tree.
+
+* Optimization: don't repeatedly look up btree handles for schema
+ operations.
+
+* Return keys from all operations: don't keep pointing to the application's
+ key.
+
+* Update btree usage of 64 bitstring implementation, so it's cleaner.
+
+* Update the bitstring implementation to use 64 bit length strings.
+
+* Updates performed without an active transaction should become visible
+ with the current transaction ID.
+
+* Upgrade to doxygen 1.8.x
+
+* Use a real snapshot transaction for checkpoints. Otherwise, the snapshot
+ can be updated in between checkpointing multiple files (when updating the
+ metadata).
+
+
WiredTiger release 1.2.2, 2012-06-20
------------------------------------