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From Enis Söztutar <e...@apache.org>
Subject First release candidate for HBase 0.99.2 (RC0) is available. Please vote by 12/06/2014
Date Wed, 03 Dec 2014 06:28:59 GMT
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_0BjPSEeEcM-w@mail.gmail.com%3E
[2]
https://mail-archives.apache.org/mod_mbox/hbase-dev/201409.mbox/%3CCAMUu0w9Y_+Afw6wW0hA_P8KBEW35B3ncsHbUQAcfndzs8TcMyA@mail.gmail.com%3E

Enis

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