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META-INF.CHANGES.txt Maven / Gradle / Ivy

1.9 (2013-05-13)
----------------
o Performance improvement on initial loading of relationship types during startup

1.9.RC2 (2013-04-30)
--------------------
o Fixes race conditions on usage of persistence windows' byte buffers that occasionally led to buffer over/underflows.

1.9.M05 (2013-03-05)
--------------------
o Concurrent modifications to relationship chains now do now lead to RecordNotInUse exceptions or
  cache poisoning
o Proper tx management will now make negative transaction counts impossible
o IndexProvider is now deprecated, replaced by KernelExtensionFactory
o Store locks are respected from read only instances too
o grab_file_lock configuration setting is now deprecated

1.9.M04 (2013-01-17)
--------------------
o Start entries are now explicitly marked as written, solves a bug that might cause recovery to fail

1.9.M02 (2012-11-30)
--------------------
o Made sure that auto-indexing removed graph elements from indexes when they are delete
o OrderByTypeExpander keeps ordering of type AND direction
o Fixed an issue where a lock on a store was sometimes not released
o Old GraphDatabaseSetting classes are now wrappers for Settings instances
o Fixes an issue where an incomplete 2PC transaction could cause recovery to not be triggered
o Optimizations for read performance
  - Cache refers to relationship types as ints instead of Strings.
  - Binary search on sorted arrays for finding properties and
    relationship types in the cache.
  - Less objects instantiated during getting and iterating relationships.
  - Reduced number of map lookups significantly for a getProperty call,
    especially outside transaction or in transactions without any changes.
    (previously 8 lookups whereof 2 synchronized, now down to as low as 2)
  - Uses ThreadLocal as mapper from thread to transaction
  - Refactored LockReleaser into TransactionState, associated with each
    transaction instead

1.9.M01 (2012-10-23)
--------------------
o XaDatasources now implement lifecycle and their registration with XaDatasourceManager triggers TxManager recovery
  on startup
o Neo4j logical log now handles running out of disk space at a critical point gracefully.
o Kernel extensions are now factories that create instances which participate in the database's lifecycle
o Fixes a race condition around relationship chain loading from multiple threads on the same node

1.8.RC1 (2012-09-05)
--------------------
o Removed contention around allocating and moving persistence windows so that a thread won't need to await
  another thread doing this refresh, instead just continue knowing that the windows will be optimally
  placed in a very near future.
o Removed contention around translating a key (as String) into the ID by using copy-on-write map instead
  of a concurrent hash map. Used in property key as well as relationship type translation.
o Fix for Node/Relationship#getPropertyValues() sometimes returning null values from the iterator.
o Important log messages from the transaction manager and the persistence window pool are now logged
  to messages.log, rather than to java.util.logging.

1.8.M07 (2012-08-08)
--------------------
o [DEPRECATION] Deprecated reference node. Indexes should be used for entry points in the graph
o Traversal framework backwards compatibility
  + Cleaned up any breaking changes
  + Removed Expander#addFilter
o Kernel JMX bean instance identifier is now reused and can optionally be set explicitly via forced_kernel_id config setting

1.8.M06 (2012-07-06)
--------------------
o Deprecated AbstractGraphDatabase.transactionRunning()
o Changed synchronization of applying transactions to prevent a deadlock scenario
o Original cause can be extracted from a transaction RollbackException

1.8.M05 (2012-06-25)
--------------------
o Configurable amount of logical logs to keep, by for example number of days or size on disk.
  keep_logical_logs configuration is extended to support values such as: "10 days", "200M size" a.s.o.
  Regardless of configuration there will always be at least the latest non-empty logical log left.
o Loosened contention in PersistenceWindowPool#acquire a bit not requiring any synchronization on the pool level.

1.8.M04 (2012-06-07)
--------------------
o Additions to the traversal framework:
  + Bidirectional traversals (with BidirectionalTraversalDescription). AllPaths/AllSimplePaths
    uses this feature and are now faster due to less relationships being traversed.
  + Multiple start nodes (as well as multiple end nodes for bidirectional traversals).
  + PathExpander (RelationshipExpander for Paths) which has the full Path passed in instead of
    just the end node of the path. It can also see and modify a user defined traversal branch state.
  + Metadata about the traversal, for the time being: number of relationships traversal and
    number paths returned.
  + Added Path#reverseNodes() and Path#reverseRelationships which gives all nodes/relationships in
    a path in reverse order (starting from the end node going back to the start node). More relevant
	in many scenarios as well as allowing for a more efficient implementation.
  + Sorting of traversal results, specify with TraversalDescription#sort(Comparable).
  + Some measure to reduce memory consumption and garbage generation during traversals.

1.8.M03 (2012-05-24)
--------------------
o Changed array map to CHM in property index manager, better multithreaded performance

1.8.M02 (2012-05-11)
--------------------
o Optimized short string and short array encoding algorithms
o Fixed problem with SpringTransactionManager during HA master switch

1.8.M01 (2012-04-26)
--------------------
o Byte array properties are handled in a more optimized way, increasing performance by a couple of times at least.
o Fix for an issue where update of cache when creating a relationship on a very dense node would take longer and longer time.
o Fix for an issue where a recovery would sometimes fail with it reporting that a start record already had been injected.

1.7 (2012-04-19)
----------------
o Moved BatchInserter to a different package.
o Fixed 'Record Not In Use' issue with creating and setting Node properties with the BatchInserter.
o Cleanup of configuration refactoring.

1.7.M03 (2012-04-11)
--------------------
o Refactoring of configuration and object instantiation.
o Removed old OSGi support in favor of the new and better one.
o Added possibility to use logback for logging.
o Renamed array cache to GC resistant cache (GCR) and moved it to enterprise.
o Fixed problem with GCR cache that could cause it to calculate incorrect size.
o Fixed problem with closing of messages.log on windows

1.7.M02 (2012-03-26)
--------------------
o Added lock free atomic array cache that avoids triggering full GCs.
o Added GC monitor that will keep track on how much the JVM blocks application threads.
o Fix for an issue where upgrading indices with an unclean shutdown.
o Replaced ArrayMap in TxManager with CHM.

1.7.M01 (2012-03-12)
--------------------
o Fixed bug in PropertyStore that during recovery would throw exception if the last record was incomplete.
o Fixes to transaction log start position caching which mitigates a performance issue and fixes a caching issue during rotation.
o Fixed a couple of issue around copying incomplete transaction to new log during a log rotation.
o Fixed a property cache poisoning bug and some stale references leaking.
o Lots of improved toString() of internal classes and better exception messages.
o Fixed a data race issue between threads removing the same property while the node is evicted from cache.
o Fixed an issue where a property record in the logical log was missing its owner.
o Added a checksum on a start record for a transaction combining Xid/master/me to get a pretty unique verification of equality.
o Log messages in messages.log are now printed in UTC time zone so that it's the same across servers.
o Fix for an issue where a full rebuild of an id generator (rebuild_idgenerators_fast=false) could result
  in exception when adding free ids.
o FileSystemAbstraction is in use everywhere instead of touch the FS directly.
o Fix for issue which would close an id generator as clean if a startup failed at the wrong time, which would make
  the id generator diverge from the store it held ids for and possible truncate that store file the next clean shutdown.

1.6 (2012-01-19)
----------------
o Minor performance optimization in property handling code.

1.6.M03 (2012-01-12)
--------------------
o Added means of introspecting locks taken by the LockManager.
o Added a diagnostics API.
o Added Index#putIfAbsent which ensures uniquely put key/value pair for an entity.
o Added UniqueFactory which gets or creates entities uniquely using Index#putIfAbsent
o Fixed an issue with upgrading an 1.5.M02 store where a "store version" record wouldn't be added and which caused problems after non-clean shutdown.
o Fixed an issue where sometimes dual start entries for a transaction would be added in the logical log.

1.6.M02 (2011-12-16)
--------------------
o Lower memory usage of ImpermanentGraphDatabase.
o Abstracted stores that stores id/name pairs into AbstractNameStore/AbstractNameRecord and removed lots of duplicated code.
o Fixed a race condition in the property cache which cuold poison the cache.
o Fixed an issue where a JVM crash in the wrong place would make the next startup rename the current logical log without
  incrementing the logVersion, making the next log rename fail.
o Start records in the logical log aren't written until the transaction starts preparing/committing. This fixes an issue
  with the logical log not being rotated sometimes.
o Added AbstractGraphDatabase#tx() which returns a TransactionBuilder possible of configuring the transaction to be "unforced"
  meaning that logical logs won't be forced when committing. Means better performance for small non-critical transactions.
o Reduced number of proxy object instantiation and node record loading in general.
o Added a wrapping graphdb abstraction, which makes instances survive even if the underlying db restarts.
o Detached LogExtractor from XaLogicaLog so that it can be used without having a db running.
o Added an API for progress indication. With a default implementation that prints dots (every 0.5%) and percentages
  (every 10%) to a PrintStream.
o Added Transaction#acquire{Read,Write}Lock for manually grabbing locks on nodes/relationships. Such locks can also be released earlier than tx.finish.

1.6.M01 (2011-11-24)
--------------------
o ImpermantentGraphDatabase now uses purely in-memory structures for speed during tests. It's done on a FileChannel level
  so that every other aspect of the database is intact, just that the bytes end up in ByteBuffers instead of files.
o Fixed an issue with evaluators not executing correctly for the start node of a traversal.
o Fixed an issue with BufferOverflowException thrown sometimes during extraction of prepared transactions.
o Added graph properties, i.e. properties that belongs to the graph itself as opposed to a specific node or relationship.
  Useful for extensions which would like to store configuration and what not.
o Better multi-line support in shell, as well as case insensitive app names.
o GraphDatabaseService#getAllNodes and #getRelationshipTypes @Deprecated and moved to GlobalGraphOperations class,
  where also #getAllRelationships is implemented.

1.5 (2011-10-18)
----------------
o Bug fixes for batch inserter and migration regarding new store format.
o Incremented log format version and added store version as a record in NeoStore for extra safety regarding migration.
o Lots of useful system/environment logging added to messages.log to help investiation of problems immensely.

1.5.M02 (2011-10-10)
--------------------
o Changes in 1.4.2
o [STORE FORMAT CHANGE] New layout of the property store(s) which results in roughly a 30% reduction in size on disk as well as fewer I/O read operations for reading properties.

1.4.2 (2011-09-27)
------------------
o Fixed bug where properties could temporarily disappear from cache if adding/removing properties on an entity in the same tx.
o Removed XaLogicalLog#getCommittedTransaction, which focused on extracting a single transaction and instead implemented getLogExtractor.
  It returns a LogExtractor which extracts transactions and keeps state after each extracted tx making it ideal to extract tx ranges.
  The implementation has got very limited and short-lived synchronization blocks.
o Fixed an issue where XaLogicalLog#applyCommittedTransaction didn't check log rotation.
o Fixed some issues with updating tx start position cache on log rotation.
o Keeping of logical logs is enabled if previous logs are discovered and configuration not explicitly disallowing it.
o Added DumpLogicalLog for index logs.
o Added an kernel panic event about TxManager set to "not OK" (and isn't able to begin any new transaction).

1.5.M01 (2011-08-31)
--------------------
o Changes in 1.4.1
o Auto indexing hooks in on each operation instead of transaction events.
o Fixed an issue where logical logs wouldn't be rotated if all transactions happened via applyPreparedTransaction (as in HA).
o Several recovery fixes which could produce an invalid state of the log files after a 2PC recovery.
o Loosened some synchronized regarding applying and getting committed transactions.
o Transaction semantics regarding call to success after failure was sync:ed with documentation.
o messages.log is rotated at 100Mb (configurable) and keeps at most three history files.
o Fixed bug where XaLogicalLog#applyTxWithoutTxId wouldn't force the logical log.
o Removed synchronization on TransactionImpl#toString() to avoid a deadlock issue.
o Fixed bug in StringLogger where it would stop logging to the underlying writer if an I/O error occurred or it was intermittently closed.

1.4.1 (2011-08-02)
------------------
o Improved file lock for an open database. Previously the file lock could be released after a full backup.
o Fixed a NPE exception during committing relationships to a NodeImpl representation.
o Fixed a data visibility issue for properties on newly created entities.
o Fixed a data visibility issue for relationships for nodes that didn't have the full relationship chain loaded.
o Fixed an issue where deleted relationships could be visible too long within the transaction deleting them.
o More relevant logging in messages.log.

1.4 (2011-07-08)
----------------
o Fixed a bug in TxLog which sometimes wouldn't write out data to the log file properly during shutdown.

1.4.M05 (2011-06-22)
--------------------
o Improved performance for recovery and extract of transaction when running HA using buffered reads to log.
o Fixed bug that returned wrong representation of cached values for longs and ints.
o Fixed bug with spurious wakeups that could cause threads to receive interrupts by the kernel in wrong context.
o Fixed invalidation problem where there were more than one iterator loading a relationship chain lazily.
o Changed ordering of writes for records during commit to make sure other transactions can't read inconsistent state.
o Fixed performance bug when loading relationship chains that caused the arrays to be resized to many times.

1.4.M04 (2011-06-10)
--------------------
o Added the ability to auto index properties for database primitives
o Locks on database primitives acquired by neostore XAResources are now released during afterCompletion()
  of the global transaction. This allows for nodes and relationships to be used as monitors in distributed
  settings. 

1.4.M03 (2011-05-26)
--------------------
o Kernel now supports self relationships or "loops".
o Added new relationship direction aware cache on nodes speeding up traversals by direction.
o Reduced memory usage by relationships.
o Reduced call stack removing the EventConsumer/ResourceConnection wrappers glue between nioneo and kernel.
o Fixed bug in global tx log that did not mark transactions finished when closed then crashed.
o Fixed cache invalidation when applying external transaction.

1.4.M02 (2011-05-12)
--------------------
o Changed the default implementation of the logical log to a DirectMappedLogBuffer.
o Changed the TxLog to use a DirectMappedLogBuffer instead of its ad hoc implementation.
o Added a configuration parameter (Config.USE_MEMORY_MAPPED_LOG) for controlling the log implementation (mmapped vs buffered)
  separately from the store files with a default value of 'false'.
  
1.3.M05 (2011-03-24)
--------------------
o Added support for HA and backup on Windows.
o Updated index API documentation.

1.3.M04 (2011-03-10)
--------------------
o A database can now contain 32 billion nodes/relationships and 64 billion properties.
o Fixed some issues with files not being closed, which also makes all tests pass on Windows.

1.3.M03 (2011-02-24)
--------------------
o Incremental and full backups can now be performed over the network (configurable port) using backup tool.
o Added optimized (compressed) storage for short strings.
o Refactored KernelExtension to make it easier to write implementations that follow the contract.
o Some refactorings and improvements around logging.

1.3.M02 (2011-02-10)
-----------------------
o Fixed a write performance bug in rotate of logical log.
o Modified persistence window allocation to be more optimistic when expanding a store file.

1.3-1.3 (2011-01-27)
--------------------

o Fix for a traverser issue where the first relationship could sometimes be skipped when choosing to traverse over relationships.
o Added SubProcess concept to ease development of tests which spawns other JVMs.
o More memory efficient extraction of transaction streams from logs.
o Better and safer upgrades from older index store formats.

1.2-1.2 (2010-12-29)
--------------------
o Made it possible to detect if recovery was performed as part of startup of the current instance.
o Fix for an issue that sometimes excluded the first relationship when iterating over the relationships of a traversal.

1.2-1.2.M06 (2010-12-21)
------------------------
- Fixed an issues with PruneEvaluators getting invoked with the start node as argument.
PruneEvaluators was never invoked with the start node before the arrival of Evaluator interface.
- Added logging of recovery completion.
- Added TransactionData#isDeleted(Node) and #isDeleted(Relationship) and also made
the collection to hold these a HashSet instead of ArrayList. This allows fast
lookups for asking if a node/relationship is deleted in a transaction.
- More flexible caching (can instantiate an arbitrary Cache object).

1.2-1.2.M05 (2010-12-02)
------------------------

-API
o Added a BatchInserterIndex.setCacheCapacity(String key, int size) method
  which can be used to enable cache for certain keys for a batch inserter
  index so that lookups will be significantly faster.
o Traversal: Added Evaluator which is a merge between PruneEvaluator and
  filter (Predicate during traversal). This allows for more flexible
  evaluators and also more performant because a pruner/filter can be merged
  together where it has a full view of the decision making.

-Optimizations
o A memory leak was fixed, leading to decreased memory usage.

1.2-1.2.M04 (2010-11-18)
------------------------

o Added ImpermanentDatabase to aid in testing

o Better toString method

1.2-1.2.M03 (2010-11-04)
------------------------

o Monitoring/management over JMX was moved to the neo4j-management component.

-API
o Added ability to get the names of existing integrated indexes:
  o Index#getName() and Index#getConfiguration()
  o IndexManager#nodeIndexNames() and #relationshipIndexNames()
o Added utility to expand traversals using a relationship type in any direction:
  o Traversal.expanderForTypes(RelationshipType)

1.2-1.2.M02 (2010-10-21)
------------------------

o HA branch merged into trunk
o Made the "soft reference" cache type default.

-New features
o Added GraphDatabaseService#index() which exposes an integrated index framework.

-Optimizations
o Getting relationships requires less cache lookups and is therefore faster.

1.2-1.2.M01 (2010-10-08)
------------------------

-New features
o Kernel extensions - additional services for the Neo4j Kernel are loaded
  automatically if they are present on the classpath.
o The ability to inject Kernel extensions in a running instance through JVM
  agents. This is used for loading the shell on an running instance.

-API
o Traversal: Uniqueness is now instantiated through a factory, with
  the previous enum (moved to org.neo4j.kernel) as default implementation.
o Filters in a traversal description are additive (just as PruneEvaluators).

-Bug fixes
o Circumvented the fact that Class.forName() sometimes throws a
  NoClassDefFoundError instead of ClassNotFoundException.

-Optimizations
o NodeImpl/RelationshipImpl takes less memory since they no longer have
  reference to NodeManager.
o Fixed some low-level throughput/concurrency issues.
o Added (default) weak reference cache option. Control with f.ex. "cache_type=weak"

1.1 (2010-07-29)
----------------

-New features
o Auto configuration by looking at available RAM and heap.
o New event framework, see http://wiki.neo4j.org/content/Event_framework
o JMX enabled kernel.
o New traversal framework, see http://wiki.neo4j.org/content/Traversal_Framework
o Block size for strings and arrays are now configurable when creating a new db.
o Read only operations can now execute without a transaction.

-API
o Added a method to get the GraphDatabaseService on Node and Relationship.
o Moved the commons component utilities into kernel component, 
  see helpers package.

-Bug fixes
o Fixed issues with logical log and active log that could cause recovery 
  to throw an exception.
o Fixed buffer overflow for large string/array properties.
o Fixed bug that could cause leak of NodeImpl.


1.0 (2010-02-16)
----------------

-API 
o Updated javadoc.

-Bug fixes
o Fixed leak of non committed property changes to other transactions.
o Fixed cache duplication bug of relationships.
o Fixed problem that could cause other exception to be thrown than 
  NotFoundException on getNodeById/RelationshipById.
o Fixed problem with recovery when LuceneFulltextIndex entries existed 
  in global transaction log.
o BatchInserter now throws exception when trying to create a relationship
  with same start and end node.
o Fixed problem with broken entries in logical log that could cause recovery 
  to throw an exception.

1.0-rc (2010-01-10)
------------------

o API: moved API to org.neo4j.grapdb and implementation to 
  org.neo4j.kernel.impl

1.0-b11 (2009-12-27)
--------------------

- Minor Enhancements, changes and tweaks
o Removed compile-time dependency on shell component.
o Batch inserter now has a NeoService version.
o Minor tweak of concurrency characteristics of array map implementation.

-Bug fixes
o Fixed problem with half entries in global tx log (due to full disk).
o Fixed some bugs in batch inserter.

1.0-b10 (2009-11-02)
--------------------

-Enhancements, new features and major changes
o Core: Read-only mode. It is now possible to start multiple read only 
  NeoServices to the same store (using EmbeddedReadOnlyNeo).
o Core:  Improved depth first traversal speed on nodes with many 
  relationships by loading relationships on demand. This will also
  reduce the stress on GC when traversing over a node with many
  relationships since much fewer objects will be created.

-Minor enhancements, changes and tweaks
o Core: Faster rebuild of id generators after a crash
o Core: Exception cleanup removing bad code either catching Throwable or 
  throwing RuntimeException.
o Core: Fixed so a read only NeoService can apply a logical log from a 
  backup.

-Bug Fixes
o Fixed a bug when using plain buffers instead of memory mapped ones that 
  could case recovery to fail due to buffers not being flushed properly.


1.0-b9 (2009-08-14)
-------------------

-Enhancements
o Core: New 'batch insert' mode, see http://wiki.neo4j.org/content/Batch_Insert,
  typically used for initial import of bulk data.
o Core: Added a "Windows mode" that uses plain Java buffers instead of mmap().
o Core: Expanded id space for all primitives by adding one more bit.
o Core: Read only transactions have been optimized to have much less overhead.
o Core: New cache implementation based on soft references, which employs faster
  gets and is more concurrent and memory efficient.
o Core: OSGi enabled [thanks Andreas Kollegger]

-Minor enhancements, changes and tweaks
o Shell: Added a traverser command for creating custom traversers.
o Shell: Added support of setting and listing array types.
o Shell: "cd" command can now position itself on a relationship.
o Shell: Output of "man" command has been improved.

-Bug fixes
o Core: Fixed all known batch inserter bugs.
o Core: Fixed a bug that could cause multiple remove of same property to fail
  (should just return null if it doesn't exist).


1.0-b8 (2009-05-03)
-------------------

-Enhancements, new features and major changes
o API: Added NeoService.getAllNodes for iterating across the entire node space
  and getRelationshipTypes() to get all reltypes in the underlying store.
o Core: Added logical log rotation and online-backup core features.
o Core: Reduced memory footprint and object allocation.
o Core: Moved all constraint checks to nioneo resulting in performance increase.
o Core: Improved traversal speed reworking set oriented caches to use arrays.

-Smaller enhancements, changes and tweaks
o API: Added a convenience implementation ofRelationshipType for dynamically
  created and named relationship types: DynamicRelationshipType.
o API: Deprecated PropertyContainer.getPropertyValues() to be removed in later
  releases.
o Core: Removed event manager dependency since it needs a rewrite (event
  generation still to be completely specified).
o Core: Transaction events have been removed, need proper specification.
o Core: Removed read lock on loading of non-cached node/relationship,
  replaced with reentrant lock stripe.
o Core: Persistence row windows in nioneo now only load data if acquired for 
  read operation.
o Core: Upgraded to JTA 1.1
o Core: Improved some error messages.
o Core: EmbeddedNeo.toString now reports object id and neo store path.
o Core: Cleaned up logging messages during recovery.
o Core: Increased default block size for string and array stores to better
  fit avg. data sets out there.

-Bug fixes
o Core: Fixed missing close on TM's active log file.
o Core: A bug with copy on write "diff" maps that could cause wrong cached value 
  to be read (for both properties and relationships) has been fixed.
o Core: Fixed an issue with non committed properties/relationships
  modifications leaking to other transactions (in cache layer during cache 
  resize).
o Core: Fixed bug in property index manager that could cause created index
  not to be published at the right time.
o Core: Fixed bug that allowed for relationship/property loads on deleted
  node (in same tx).
o Core: Fixed some bugs caused by use of JTA tx synchronization hooks (we can't 
  use them when ordering is required).
o Core: Fixed bug with relationship type store not handling "holes" correctly.
o Core: Fixed problem with multiple calls to close() on XaDataSources
o Core: Removed use IOException( Throwable ) since it is not in Java 1.5
o Core: Parsing of memory mapped settings can now handle G (1024*1024*1024).
o Core: Fixed silent catch of NotFoundException in traverser implementation.

-Notes
o Testing on Windows Vista platform has revealed a strange performance
  degradation for b8 that we've yet to find the cause of. The problem becomes
  more visible when running many concurrent transactions/threads hammering
  requests to Neo (10x performance decrease has been observed on same hardware).
  For production systems we recommend using GNU Linux or Solaris OS with Sun's
  1.6 JVM for best performance.


1.0-b7 (2008-09-29)
------------------

o API: Removed a number of deprecated methods (primarily for relationship type
  management) from EmbeddedNeo as per warning in the previous release.
o API: Transaction is now an interface.
o API: TraversalPosition now has an isStartNode() method.
o API: NotFound and NotInTransaction runtime exceptions have been moved from
  internal impl package to the api package.
o API: getRelationshipById is now exposed in NeoService.
o API: A common base interface for Node and Relationship has been added that
  contains the set/get/remove property operations.
o Core: Made it easy to embed Neo4j in a Spring application. Spring can also be 
  configured to use Neo4j's transaction manager.
o Core: All known bugs have been fixed.
o Core: Removed singletons and made everything IoC.
o Core: Lots of minor optimization and improvements above native store
  layer (nioneo).
o Core: Cleanup of code (removed non used code) and improved exception handling.
o Core: Improved read performance and parallelism by implementing MVCC-like 
  features. No locks are now taken during read-only operations, instead
  concurrent operations are working against snapshot versions. Rather than full
  versioning, for higher performance diffs are kept and applied to the right
  transactions (those that have modified data). Result is that read operations
  will execute taking no locks, make full use of what has already been cached
  and can execute concurrently with a transaction that modify the same data.
  Write operations will take locks and use diffs instead of full copy on write
  (this proved to be faster and scale better than actually doing a in memory
  copy of the required data).


1.0-b6 (2007-11-19)
-------------------

o API: Added a NeoService interface that EmbededNeo implements. Left a number
  of methods in EmbeddedNeo for backwards compatibility. They will be removed
  the next release.
o API: Changed relationship types to be dynamic, i.e. created in underlying
  store when they are first used. This means that clients won't have to
  register them with EmbeddedNeo at startup.
o API: The semantics of relationship type equivalence has changed from being
  based strictly on object identity to being based on name() equality.
o API: A a new method isType() has been added to Relatinship. Due to the less
  intuitive ways to check reltype equivalence, it's the prefered way to check
  whether a relationship is of a particular type.
o API: Added convenience methods hasRelationship(...) to Node.
o API: Added a convenience method notStartNode() to TraversalPositions to
  clean up the code (less cumbersome null-checks for edge cases) for evaluator
  implementations.
o Shell: Now detects and lists all available commands dynamically.
o Shell: Integration with Groovy for easy evaluation of Groovy scripts.
o Shell: Now auto-reconnects to server.
o Shell: Polish like cleaner output, filters to ls and bash-style prompt with
  variable expansion.
o Core: Lots of performance tweaks and improvements.
o Core: The internal version of the datastores have been changed. This release
  will transparently upgrade old versions of the store files so there's nothing
  manual involved. But after that, previous releases of Neo won't be able to
  read the store files.
o Core: Testing and robustification on Windows.
o Core: Now fully supports array properties for all primitives and Strings.