First release candidate for HBase 0.99.2 (RC0) is available. Please vote by 12/06/2014
The first release candidate for the third release from branch-1, HBase 0.99.2 RC0, is available for download at https://people.apache.org/~enis/hbase-0.99.2RC0/ Maven artifacts are also available in the temporary repository https://repository.apache.org/content/repositories/orgapachehbase-1048/ Signed with my code signing key E964B5FF. Can be found here: https://people.apache.org/keys/committer/enis.asc Signed tag in the repository can be found here: https://git-wip-us.apache.org/repos/asf?p=hbase.git;a=tag;h=080ab7230847776b7a2867dcbd3d421969d2dd37 NOTE IN GIGANTIC LETTERS THAT THIS IS A DEVELOPER RELEASE. DO NOT USE THIS RELEASE IN PRODUCTION. HBase 0.99.2 is a "developer preview" release, and an odd-numbered release as defined in https://hbase.apache.org/book/upgrading.html#hbase.versioning. This release IS NOT intended for production use, and does not contain any backwards or forwards compatibility guarantees (even within minor versions 0.99.x). Please refrain from deploying this over important data. 0.99.2 release is provided from branch-1, which will be the basis for HBase-1.0 release. This is the last planned 0.99.x release before 1.0. The reason for doing a developer preview release is to get more testing for the branch-1 code that will be released soon as HBase-1.0.0. Thus, 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. 0.99.2 builds on top of all the changes that is in the 0.99.0 (an overview can be found at [1]) and 0.99.1 releases[2]. 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 0.99.2 release. Marking/remarking of interfaces with InterfaceAudience has also been going on (HBASE-10462), which will identify areas for compatibility (with clients, coprocessors and dependent projects like Phoenix) for future releases. 0.99.2 contains 190 issues fixed on top of 0.99.1. Some other notable improvements in this release are - [HBASE-12075] - Preemptive Fast Fail - [HBASE-12147] - Porting Online Config Change from 89-fb - [HBASE-12354] - Update dependencies in time for 1.0 release - [HBASE-12363] - Improve how KEEP_DELETED_CELLS works with MIN_VERSIONS - [HBASE-12434] - Add a command to compact all the regions in a regionserver - [HBASE-8707] - Add LongComparator for filter - [HBASE-12286] - [shell] Add server/cluster online load of configuration changes - [HBASE-12361] - Show data locality of region in table page - [HBASE-12496] - A blockedRequestsCount metric - Switch to using new style of client APIs internally (in a lot of places) - Improvements in visibility labels - Perf improvements - Some more documentation improvements - Numerous improvements in other areas and bug fixes. The release has these changes in default behavior (from 0.99.1): - Disabled the "Distributed Log Replay" feature by default. Similar to 0.98 and earlier releases "Distributed Log Split" is the default. Thanks for everybody who have contributed to this release. Full list of the issues can be found here: https://issues.apache.org/jira/secure/ReleaseNote.jspa?projectId=12310753&version=12328822 Compatibility ------------- 0.99.x series of releases are preview of upcoming 1.0 release. HBase-1.0 is planned to be wire compatible with 0.98.x releases. Clients and servers running in different versions as long as new features are not used should be possible. A rolling upgrade from 0.98.x clusters to 0.99.2 is supported as well. 0.99.2 introduces a new file format (hfile v3) that is enabled by default that 0.96.x code cannot read. Thus, rolling upgrade from 0.96 directly to 0.99 is not supported. Direct migration from 0.94.x, 0.96.x and 0.98.x is also supported but it IS NOT tested extensively. Before HBase-1.0 we expect to complete the tests. Binary compatibility at the Java API layer with earlier versions (0.98.x, 0.96.x and 0.94.x) is not supported. You may have to recompile your client code and any server side code (coprocessors, filters etc) referring to hbase jars. 0.99.x release introduces new APIs, and deprecates some of commonly-used client side APIs (HTableInterface, etc). However, client side code is expected to be source compatible with earlier versions. However we advise to update your application to use the new style of APIs, since deprecated APIs might be removed in future releases (2.x). Supported Hadoop versions ------------------------- 0.99.x releases drop support for Hadoop-1.x releases. Only Hadoop-2.x releases are supported. Hadoop-2.4.x and Hadoop-2.5.x releases are the most tested hadoop releases and we recommend running with those versions (or later versions). Earlier Hadoop-2 based releases (hadoop-2.2.x and 2.3.x) are not tested to the full extend. More information can be found here: https://hbase.apache.org/book/configuration.html#hadoop Supported Java versions ------------------------- 0.99.x releases drop support for JDK6. Only JDK7 is supported. JDK8 support is experimental. More information can be found here: https://hbase.apache.org/book/configuration.html#java Voting ------ Please try to test and vote on this release by 12/06/2014 11:59PM PDT. This is a developer (beta) release, so we have a shorter vote time. [] +1 Release the artifacts as 0.99.2 [] -1 DO NOT release the artifacts as 0.99.2, because... Thanks for helping to get a stable release out! References ---------- [1] https://mail-archives.apache.org/mod_mbox/hbase-dev/201409.mbox/%3ccamuu0w94oarqcz2zy4zlqy_aaqn70whhh1ycs_0bjpseeec...@mail.gmail.com%3E [2] https://mail-archives.apache.org/mod_mbox/hbase-dev/201409.mbox/%3ccamuu0w9y_+afw6ww0ha_p8kbew35b3ncshbuqacfndzs8tc...@mail.gmail.com%3E Enis
