Apache Accumulo is a mashup of various technologies, from Google's BigTable, to Apache's Hadoop, Thrift and Zookeeper.
Compared to Google's BigTable system, Accumulo features a few improvements of its own.
These include table cell-based access restrictions, a server-side system for managing key-value pairs at desired times and in optimum conditions, and lots of client APIs.
The database is certainly not for running your every day websites and is targeting for cloud-computing environments where developers need to handle humongous amounts of information.
What is new in this release:
- Use of Hadoop CredentialProviders
- Write-Ahead Log sync performance
- Minor-Compactions not aggressive enough
- Write-Ahead log sync implementation
- HeapIterator optimization
What is new in version 1.6.2:
- Use of Hadoop CredentialProviders
- Write-Ahead Log sync performance
- Minor-Compactions not aggressive enough
- Write-Ahead log sync implementation
- HeapIterator optimization
What is new in version 1.6.0:
- Service IP addresses
- Multiple volume support
- Table namespaces
- Pluggable compaction strategies
- Conditional mutations
- Locality groups in memory
- Size-based constraint on new tables
What is new in version 1.4.1:
- Optionally monitor swappiness on every server.
- Support running on-top of Kerberos-enabled HDFS.
- Provide method for gathering system stats to API.
What is new in version 1.4.0:
- Tablet merging
- Efficient deletion of row range
- Compaction of row range
- Table cloning
- FATE: Fault Tolerant Executor. Used to make table operation survive master restart.
- Concurrent table operation execute correctly
- Bulk load is now done by master and tablet servers and uses FATE to survive server restarts.
- Multi-level RFile index
- Merging minor compactions
- Logical time for bulk import
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