The HBase Team is pleased to announce the immediate release of HBase 0.99.1. Download it from your favorite Apache mirror [1] or maven repository.
THIS RELEASE IS NOT INTENDED FOR PRODUCTION USE, and does not contain any backwards or forwards compatibility guarantees (even within minor versions of 0.99.x). Please refrain from deploying this over important data. Use latest 0.98.x release instead. HBase 0.99.1 is a "developer preview" release, and an odd-numbered release as defined in [2]. A series of of 0.99.x releases are planned in preparation for 1.0.0 release which will be the next stable and supported release. Please use this release as a test bed for the upcoming HBase-1.0 release. Report any encountered problems or features that you think need fixing before 1.0. This release also contains some API changes, and deprecation of older APIs which won't be supported in 2.0 series. Please give them a try and let us know what you think. All contribution in terms of testing, benchmarking, checking API / source /wire compatibility, checking out documentation and further code contribution is highly appreciated. 1.0 will be the first series in the 1.x line of releases which are expected to keep compatibility with previous 1.x releases. Thus it is very important to check the client side and server side APIs for compatibility and maintainability concerns for future releases. 0.99.1 builds on top of all the changes that is in the 0.99.0 release (an overview can be found at [1]). The theme of (eventual) 1.0 release is to become a stable base for future 1.x series of releases. 1.0 release will aim to achieve at least the same level of stability of 0.98 releases without introducing too many new features. The work to clearly mark and differentiate client facing APIs, and redefine some of the client interfaces for improving semantics, easy of use and maintainability has continued in 0.99.1 release. Remaining work can be found in HBASE-10602. Marking/remarking of interfaces with InterfaceAudience has also been going on, which will identify areas for compatibility (with clients, coprocessors and dependent projects like Phoenix) for future releases. 0.99.1 changes some of the behavior for master / region colocation that was introduced in 0.99.0 (see [1]). Now, the backup masters can no longer host any regions. And active master can host regions of defined tables if configured. Otherwise, it will not show up the region server UI similar to a 0.98 deployment. Though master and region server still shares the same rpc ports. Details can be found here (HBASE-12034 and HBASE-10569). Some other notable improvements in this release are - [HBASE-11178] - Remove deprecation annotations from mapred namespace - [HBASE-11920] - Add CP hooks for ReplicationEndPoint - [HBASE-11997] - CopyTable with bulkload - [HBASE-12059] - Create hbase-annotations module - [HBASE-11990] - Make setting the start and stop row for a specific prefix easier - [HBASE-12220] - Add hedgedReads and hedgedReadWins metrics - [HBASE-12090] - Bytes: more Unsafe, more Faster - [HBASE-12032] - Script to stop regionservers via RPC - [HBASE-11907] - Use the joni byte[] regex engine in place of j.u.regex in RegexStringComparator - [HBASE-11796] - Add client support for atomic checkAndMutate - [HBASE-11804] - Raise default heap size if unspecified - [HBASE-11890] - HBase REST Client is hard coded to http protocol - [HBASE-12126] - Region server coprocessor endpoint - [HBASE-12183] - FuzzyRowFilter doesn't support reverse scans - [HBASE-12197] - Move REST (create hbase-rest module) - Continuation of the cell-based read / write pipeline work for performance boost - Various fixes to REST server - Some more documentation improvements - Numerous improvements in other areas and bug fixes. The release has these changes in default behavior: - default heap for region servers (and master) is changed from 1GB to the jdk's default. On most platforms, it will default to 1/4 of physical memory - mapred package and classes under there has been un-deprecated. - two new modules (jar files): hbase-annotations and hbase-rest - Slab cache has been removed (use bucket cache instead) - Some more client API cleanup. The list of changes in this release can be found in the release notes [3] and a higher level summary can be found at [4]. Thanks to everybody who contributed to this release! Cheers, The HBase Team 1. http://www.apache.org/dyn/closer.cgi/hbase/ 2. https://hbase.apache.org/book/upgrading.html#hbase.versioning 3. https://issues.apache.org/jira/secure/ReleaseNote.jspa?projectId=12310753&version=12328551 4. https://mail-archives.apache.org/mod_mbox/hbase-dev/201410.mbox/%3CCAMUu0w-k+nCr-drYe6udBVXQq=m8wrxfx3dshdvo5awoj-t...@mail.gmail.com%3E
