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From Enis Söztutar <e...@apache.org>
Subject [VOTE] First release candidate for HBase 1.0.2 (RC0) is available. Please vote by July 14 2015
Date Tue, 07 Jul 2015 20:30:53 GMT
 I am pleased to announce that the first release candidate for the release
1.0.2
(HBase-1.0.2RC0), is available for download at
https://dist.apache.org/repos/dist/dev/hbase/hbase-1.0.2RC0/

Maven artifacts are also available in the temporary repository
https://repository.apache.org/content/repositories/orgapachehbase-1088

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=11de648322d50c509e15373b3e35db1020a7d2c1


HBase 1.0.2 is the next “patch” release in the 1.0.x release line and
supersedes 1.0.0 and 1.0.1.
According to the HBase’s semantic version guide (See [1]), the release
candidate is
source and binary compatible with 1.0.x for client applications and server
side libraries
(coprocessors, filters, etc).

Binary / source compatibility report of 1.0.2RC0 compared to 1.0.1 can be
reached here:
https://people.apache.org/~enis/1.0.1_1.0.2RC0_compat_report.html


1.0.2 release contains 123 fixes on top of 1.0.1 release. Most of
the changes are
bug fixes or test fixes except for the following:

** Improvement
    * [HBASE-12415] - Add add(byte[][] arrays) to Bytes.
    * [HBASE-12957] - region_mover#isSuccessfulScan may be extremely slow
on region with lots of expired data
    * [HBASE-13247] - Change BufferedMutatorExample to use addColumn()
since add() is deprecated
    * [HBASE-13344] - Add enforcer rule that matches our JDK support
statement
    * [HBASE-13366] - Throw DoNotRetryIOException instead of read only
IOException
    * [HBASE-13420] - RegionEnvironment.offerExecutionLatency Blocks
Threads under Heavy Load
    * [HBASE-13431] - Allow to skip store file range check based on column
family while creating reference files in HRegionFileSystem#splitStoreFile
    * [HBASE-13550] - [Shell] Support unset of a list of table attributes
    * [HBASE-13761] - Optimize FuzzyRowFilter
    * [HBASE-13780] - Default to 700 for HDFS root dir permissions for
secure deployments
    * [HBASE-13828] - Add group permissions testing coverage to AC.
    * [HBASE-13925] - Use zookeeper multi to clear znodes in ZKProcedureUtil

** New Feature
    * [HBASE-13057] - Provide client utility to easily enable and disable
table replication

** Task
    * [HBASE-13764] - Backport HBASE-7782
(HBaseTestingUtility.truncateTable() not acting like CLI) to branch-1.x
    * [HBASE-13799] - javadoc how Scan gets polluted when used; if you set
attributes or ask for scan metrics

** Sub-task
    * [HBASE-7847] - Use zookeeper multi to clear znodes
    * [HBASE-13035] - [0.98] Backport HBASE-12867 - Shell does not support
custom replication endpoint specification
    * [HBASE-13201] - Remove HTablePool from thrift-server
    * [HBASE-13496] - Make
Bytes$LexicographicalComparerHolder$UnsafeComparer::compareTo inlineable
    * [HBASE-13497] - Remove MVCC stamps from HFile when that is safe
    * [HBASE-13563] - Add missing table owner to AC tests.
    * [HBASE-13579] - Avoid isCellTTLExpired() for NO-TAG cases
    * [HBASE-13937] - Partially revert HBASE-13172·
    * [HBASE-13983] - Doc how the oddball HTable methods getStartKey,
getEndKey, etc. will be removed in 2.0.0
    * [HBASE-14003] - work around jdk8 spec bug in WALPerfEval


Full list of the issues can be found at
https://issues.apache.org/jira/secure/ReleaseNote.jspa?version=12329865&styleName=Html&projectId=12310753&Create=Create


Compatibility
-------------
This release (1.0.2) is source, wire and binary compatible with all
previous 1.0.x releases. Client
applications do not have to be recompiled with the new version (unless new
API is used)
if upgrading from a previous 1.0.x. It is a drop-in replacement.

See release notes for 1.0.0 [2] for compatibility with earlier
versions (0.94, 0.96, 0.98).
Compatibility of 1.0.2 with earlier versions is the same as in 1.0.0.

Source Compatibility:
Client side code in HBase-1.0.x is (mostly) source compatible with 0.98.x
versions. Some minor API changes might be needed from the client side.

Wire Compatibility:
HBase-1.0.x release is 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 1.0.x is supported as well.
Rolling upgrade from 0.96 directly to 1.0.x is not supported.
1.0.x is NOT wire compatible with earlier releases (0.94, etc).

Binary Compatibility:
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.


Upgrading
---------
This release is rolling upgradable from earlier 1.0.x releases.

See [2] and [3] for upgrade instructions from earlier versions. Upgrading
to 1.0.2 is similar
to upgrading to 1.0.0 as documented in [3].

>From 0.98.x : Upgrade from 0.98.x in regular upgrade or rolling upgrade
fashion
is supported.

>From 0.96.x : Upgrade from 0.96.x is supported with a shutdown and restart
of
the cluster.

>From 0.94.x : Upgrade from 0.94.x is supported similar to upgrade from
0.94 -> 0.96. The upgrade script should be run to rewrite cluster level
metadata.
See [3] for details.


Supported Hadoop versions
-------------------------
1.0.x releases support only Hadoop-2.x. Hadoop-2.4.x, Hadoop-2.5.x
and Hadoop-2.6.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 at [4].


Supported Java versions
-------------------------
1.0.x releases only support JDK7. JDK8 support is experimental. More
information can be
found at [5].


Voting
------
Please try to test and vote on this release by July 14 2015 11:59PM PDT.

[] +1 Release the artifacts as 1.0.2
[] -1 DO NOT release the artifacts as 1.0.2, because...


References
----------
[1] https://hbase.apache.org/book/upgrading.html#hbase.versioning
[2] http://s.apache.org/hbase-1.0.0-release-notes
[3] https://hbase.apache.org/book/upgrade1.0.html#upgrade1.0.changes
[4] https://hbase.apache.org/book/configuration.html#hadoop
[5] https://hbase.apache.org/book/configuration.html#java


Thanks all who worked on this release!

Enis

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