Neo4j 2.0 Advanced changelog
Cypher:
- MERGE must fail when trying to create 2 nodes with same id but different labels (e.g., MERGE (a: Foo)-[r:KNOWS]->(a: Bar))
- Allow Cypher split() with empty separator
- Ensure Cypher range() works with negative step values
Kernel:
- Fixes a deadlock issue in the page cache
- Fix a transaction log issue where the log could be written to after tx manager marked as NOT_OK.
- Performance improvements for concurrent reads
Cypher:
- Fixes #1897 - goes into never ending loop for some aggregate queries
- Add the functions toInt(...) and toFloat(...)
- Renames the Cypher type Double to Float
- Add the function split(...)
- Reading a non-existent property from a map returns null rather than failing
- MERGE will choose a direction when it has to create a relationship if you use an undirected relationship pattern
Kernel:
- Fixes an issue with tx log reading in severely damaged log files.
- Fixes a JVM deadlock issue between committing and a reading thread
- Can now handle more gracefully a larger set of failed index states
- Logical logs are now kept, by default, for 7 days to make backup more likely to choose incremental.
- Fixes issue where store migration forgets about legacy indexes
- Datasource specific transaction application now respects global TM state
- Fix a cache poisoning issue where large properties would keep a reference to a closed store after a HA role switch. Manifested as NullPointerException when reading very large properties in rare cases.
- Fixes an issue where indexes that have been dropped would fail recovery if commands to activate them were run in recovery.
- Fixes byte count monitoring
- Fixes issue with proper update of indexes that came from improper command execution order
- Fixes memory leak in XaResourceManager that could lead recovered transaction application to delay noticeably
- Fixes null pointer exceptions coming from LazyProperties being half loaded while a datasource restart happens
Server:
- Fixes github issues #1872, #961 that deal with Content-Encoding headers
- Server log and messages.log now share common formatting. Achieved through the use of the same logging framework
Kernel:
- Improve speed of verifying unique constraints on constraint creation.
- Improve speed of creating label scan store in BatchInserter.
- Fixes issue with batch inserter which could lead to record not in use exception when adding properties
- Introduces monitoring for reads/writes to the logical log
Cypher:
- Fixes a concurrency problem in query parser
Server:
- Fixes issue with transactions leaking when there is an exception while rendering the response
Cypher:
- Fixes bug around MERGE inside a FOREACH inside a FOREACH
- Makes it possible to write MERGE queries with no already known parts
- Fixes problem with compiling queries with NOT expressions in them
- Fixes #1735 - Indexes and AND predicates produce wrong results
- Fixes #1876 - Null nodes and properties should be ignored when SETting properties
- Fixes problem with parser not being thread safe. State is bad, m'kay?
- Add support for double literals in exponent form
- Use internal heirarchy for types. Previously dependeded on Scala type hierarchy
- Fixes MERGE without any identifier previously known
- Corrects numerous inconsistencies when performing static type inference during compilation.
Cypher:
- Fix for problem with index lookups against properties
- Fix: MERGE should work when finding multiple elements
- Fix: Should support updates for merging
- Fix issue when mixing Cypher queries of different versions
- Fix problems with CREATE for relationships without declared nodes
- Allow MERGE to run inside FOREACH
- Prevent the use of parameter maps in MATCH and MERGE
Kernel: o BREAKING CHANGE: Reference node has been removed. o BREAKING CHANGE: All classes under the org.neo4j.kernel package space, except those related to the traversal frameworks, are now deprecated and due to be moved into internal packages. This includes well-known classes such as EmbeddedGraphDatabase and HighlyAvailableGraphDatabase, both of which are replaced by GraphDatabaseFactory and HighlyAvailableGraphDatabaseFactory, respectively. o BREAKING CHANGE: Removed deprecated settings from org.neo4j.graphdb.factory.GraphDatabaseSettings. These settings are no longer effective and can be removed without any effect. o BREAKING CHANGE: Removed deprecated org.neo4j.graphdb.index.IndexProvider (and associated org.neo4j.graphdb.index.IndexIterable and org.neo4j.graphdb.index.IndexProviderKernelExtensionFactory). This has been replaced by the kernel extension mechanism. o BREAKING CHANGE: Removed deprecated org.neo4j.graphdb.PropertyContainer#getPropertyValues(). Instead use org.neo4j.graphdb.PropertyContainer#getPropertyKeys() and org.neo4j.graphdb.PropertyContainer#getProperty(String). o BREAKING CHANGE: Removed deprecated methods from org.neo4j.kernel.GraphDatabaseAPI: #getDiagnosticsManager(), #getMessageLog(), #getIdGeneratorFactory(), #getKernelData() and #getPersistenceSource(). These are internal components which Kernel clients should not need to access. The entire org.neo4j.kernel.GraphDatabaseAPI interface is deprecated and will be removed in future. o BREAKING CHANGE: Deprecated constructors of EmbeddedReadOnlyDatabase and EmbeddedGraphDatabase have been removed, in favor of the long-advertised alternative GraphDatabaseFactory. o BREAKING CHANGE: All deprecated methods in GraphDatabaseAPI have been removed in favor of getDependencyResolver().
Cypher: o Add OPTIONAL MATCH to Cypher o Remove question mark symbol from patterns in Cypher o Fixes 1313 o Fixes problem with collection index types o Changes behaviour of LAST/HEAD/TAIL and collection slice - they now all return null for ranges outside a collection o Fixed #1471 - SETting a relationship to a map value fails
Shell: o Add '-' as filename for piping stdin directly into the shell, behaves as a file import.
Server: o BREAKING CHANGE: Removed deprecated method org.neo4j.server.AbstractNeoServer#stopServerOnly(). To stop the server use org.neo4j.server.AbstractNeoServer#stop(). If you would like to disconnect the database life cycle from server control use org.neo4j.server.WrappingNeoServer. o BREAKING CHANGE: org.neo4j.server.database.Database is now an interface. Direct uses of the class can be replaced by one of its implementations. o Transactional endpoint status codes are now textual rather than numeric. Since the transactional endpoint was introduced in the 2.0.0 series, it is not considered a breaking change. It will, however, require modifying client code that depends on the numeric status codes.
- Windows desktop GUI added
Cypher: o Parenthesis around nodes are now mandatory if a label is used on the node
Kernel: o BREAKING CHANGE: GraphDatabaseSettings now only exposes Setting, deprecated settings classes have been removed. o Fixed problems with array properties being updated multiple times in a single transaction o Adds label store as an index o Transaction now implements AutoClosable o Distinguish between data and schema transactions o Unique constraint validation for new data
Cypher: o Promote the experimental parser to the default o Added literal maps o Makes RETURN only queries valid o Labels on optional nodes no longer stop the whole MATCH clause from returning results. o Updated NOT precedence o Added collection slice and collection index o Added list comprehension documentation
Shell: o Adds support for RETURN only Cypher queries
Kernel: o BREAKING CHANGE: Require Java 7 o BREAKING CHANGE: Transactions are now required for all operations throughout Java Core API, read operations as well as write operations o Define proper equality for indexing of array properties o BREAKING CHANGE: Equality for indexing of number properties compares numbers independent of underlying primitive Java type
Cypher: o Fixes #844 - Label predicate do not work on optional nodes that are null o Fixes #897 - Cypher start doesnt allow combining multiple starting points with start node sets o BREAKING CHANGE: Removes "?", "!" syntax for accessing properties. Missing properties are now treated as null o Introduced a new experimental and fast PEG parser o BREAKING CHANGE: Escaped identifiers in the RETURN clause are kept as the user entered them o BREAKING CHANGE: No longer possible to use expressions and params to identify nodes in patterns o BREAKING CHANGE: Use "|" in favor of ":" in FOREACH, EXTRACT and REDUCE to avoid disambiguity with label syntax
Server: o Added support for extracting and returning the graph structure from the result of a Cypher query executed via the transactional endpoint
Kernel: o Read-only index results are closed properly
Cypher: o Make Cypher execution results closable o Adds Cypher label scan hint o Removes alternative WITH syntax in Cypher o Fixes bug with UNION text output o Added startNode()/endNode() o Fixes #780 - Queries with literal collections fail against schema indexes
Server: o Added support for transaction keep-alive
- In server, added REST transaction support
- In cypher, added MERGE clause
- In cypher, MATCH now supports single-node patterns
- In shell, support for listing indexes and their state
- Support for labels in the org.neo4j.unsafe.batchinsert APIs.
- BREAKING CHANGE: Replaced protected fields from org.neo4j.graphdb.factory.GraphDatabaseFactory with a single org.neo4j.graphdb.factory.GraphDatabaseFactoryState instance to avoid race conditions when creating multiple, lazily instantiated builders
- BREAKING CHANGE: org.neo4j.graphdb.index.BatchInserterIndex and org.neo4j.graphdb.index.BatchInserterIndexProvider has been removed in favor of the same interfaces available in org.neo4j.unsafe.batchinsert
- BREAKING CHANGE: The BatchInserter and the BatchGraphDatabase are not binary compatible with 1.9 due to some methods now taking a varargs array of labels as last argument. Please recompile any code that depends on the BatchInserter.
- Added support for labels across all APIs: Cypher, Core Java and REST
- Added support for the new label-based indexes across all APIs: Cypher, Core Java and REST
- Improvements to shell, including import/export of small graphs via cypher statements
