Apache Cassandra

Apache Cassandra is an open source database for those who want high availability and scalability without compromising performance, by combining the convenience of column indexes, with the performance of log-structured updates, powerful built-in caching, and strong support for materialized and denormalization views.

Among some of the benefits of the Apache Cassandra project, we can mention integrated caching, linearly scalability, tunable consitency, fully distributed and multi-master.

Apache Cassandra is proven, fault tolerant, decentralized, elastic, durable and it is professionally supported. It features rich data model and puts the user in control. It is distributed as a standalone application via the Apache Software Foundation.

What is new in this release:

• Fix bug that could allow reading deleted data temporarily (CASSANDRA-6025)
• Improve memory use defaults (CASSANDRA-5069)
• Make ThriftServer more easlly extensible (CASSANDRA-6058)
• Remove Hadoop dependency from ITransportFactory (CASSANDRA-6062)
• add file_cache_size_in_mb setting (CASSANDRA-5661)
• Improve error message when yaml contains invalid properties (CASSANDRA-5958)
• Improve leveled compaction's ability to find non-overlapping L0 compactions to work on concurrently (CASSANDRA-5921)
• Notify indexer of columns shadowed by range tombstones (CASSANDRA-5614)
• Log Merkle tree stats (CASSANDRA-2698)
• Switch from crc32 to adler32 for compressed sstable checksums (CASSANDRA-5862)
• Improve offheap memcpy performance (CASSANDRA-5884)
• Use a range aware scanner for cleanup (CASSANDRA-2524)
• Cleanup doesn't need to inspect sstables that contain only local data (CASSANDRA-5722)
• Add ability for CQL3 to list partition keys (CASSANDRA-4536)
• Improve native protocol serialization (CASSANDRA-5664)
• Upgrade Thrift to 0.9.1 (CASSANDRA-5923)
• Require superuser status for adding triggers (CASSANDRA-5963)
• Make standalone scrubber handle old and new style leveled manifest (CASSANDRA-6005)
• Fix paxos bugs (CASSANDRA-6012, 6013, 6023)
• Fix paged ranges with multiple replicas (CASSANDRA-6004)
• Fix potential AssertionError during tracing (CASSANDRA-6041)
• Fix NPE in sstablesplit (CASSANDRA-6027)
• Migrate pre-2.0 key/value/column aliases to system.schema_columns (CASSANDRA-6009)
• Paging filter empty rows too agressively (CASSANDRA-6040)
• Support variadic parameters for IN clauses (CASSANDRA-4210)
• cqlsh: return the result of CAS writes (CASSANDRA-5796)
• Fix validation of IN clauses with 2ndary indexes (CASSANDRA-6050)
• Support named bind variables in CQL (CASSANDRA-6033)
• Merged from 1.2:
• Allow cache-keys-to-save to be set at runtime (CASSANDRA-5980)
• Avoid second-guessing out-of-space state (CASSANDRA-5605)
• Tuning knobs for dealing with large blobs and many CFs (CASSANDRA-5982)
• (Hadoop) Fix CQLRW for thrift tables (CASSANDRA-6002)
• Fix possible divide-by-zero in HHOM (CASSANDRA-5990)
• Allow local batchlog writes for CL.ANY (CASSANDRA-5967)
• Upgrade metrics-core to version 2.2.0 (CASSANDRA-5947)
• Add snitch, schema version, cluster, partitioner to JMX (CASSANDRA-5881)
• Fix CqlRecordWriter with composite keys (CASSANDRA-5949)
• Add snitch, schema version, cluster, partitioner to JMX (CASSANDRA-5881)
• Allow disabling SlabAllocator (CASSANDRA-5935)
• Make user-defined compaction JMX blocking (CASSANDRA-4952)
• Fix streaming does not transfer wrapped range (CASSANDRA-5948)
• Fix loading index summary containing empty key (CASSANDRA-5965)
• Correctly handle limits in CompositesSearcher (CASSANDRA-5975)
• Pig: handle CQL collections (CASSANDRA-5867)
• Pass the updated cf to the PRSI index() method (CASSANDRA-5999)
• Allow empty CQL3 batches (as no-op) (CASSANDRA-5994)
• Support null in CQL3 functions (CASSANDRA-5910)
• Replace the deprecated MapMaker with CacheLoader (CASSANDRA-6007)
• Add SSTableDeletingNotification to DataTracker (CASSANDRA-6010)
• Fix snapshots in use get deleted during snapshot repair (CASSANDRA-6011)
• Move hints and exception count to o.a.c.metrics (CASSANDRA-6017)
• Fix memory leak in snapshot repair (CASSANDRA-6047)
• Fix sstable2sjon for CQL3 tables (CASSANDRA-5852)

What is new in version 1.2.0:

• Disallow counters in collections (CASSANDRA-5082)
• cqlsh: add unit tests (CASSANDRA-3920)
• fix default bloom_filter_fp_chance for LeveledCompactionStrategy (CASSANDRA-5093)

Requirements:

• Java 2 Standard Edition Runtime Environment