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Date: Sat, 19 Oct 2013 13:31:32 -0700
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Subject: Re: [ANNOUNCE] Apache HBase 0.96.0 is now available for download
From: Dave Wang <dsw@cloudera.com>
To: "user@hbase.apache.org" <user@hbase.apache.org>
Cc: "announce@apache.org" <announce@apache.org>,
	"general@hadoop.apache.org" <general@hadoop.apache.org>
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Congratulations everyone!

- Dave

On Saturday, October 19, 2013, Stack wrote:

> hbase-0.96.0 is now available for download [0].
>
> Apache HBase is a scalable, distributed data store that runs atop Apache
> Hadoop.
>
> The hbase-0.96.0 release has been more than a year in the making and
> supplants our long-running 0.94.x series of releases.  We encourage users
> upgrade.
>
> More than 2k issues [1][2][3][4] are attributed to this version (counting
> fixes done against this and the preview 0.95.x developer series of
> releases). [7] is the total list of 0.96.0 changes.  1500+ of these changes
> are in 0.96.0 alone; i.e. they have not been backported.  At the end of
> this note is a sampling of some notable fixes.
>
> High-level, the big themes driving this release have been improved
> stability, operability, scaling fixes, and making it so we are in a
> situation where we are free to evolve going forward while all the time
> maintaining forward and backward compatibility. A bunch of work has been
> done to improve Mean Time To Recovery on server and node crash. Everywhere
> HBase persists has been moved to protobufs [8] including what we write
> across the wire RPC'ing. We have a new balancer, call tracing, namespaces,
> revamped metrics, hardened replication and assignment, client-side types
> and mountains more of new utility and improvements.
>
> hbase-0.96.0 comes in two flavors; a build that includes and runs on
> hadoop-1.x
> and another for hadoop-2.x. You must chose the hbase that suits your
> hadoopcontext. You will need to restart your cluster on deploy. On
> restart,
> HBase will run a few migration tasks that will complete in seconds, and off
> you go again. hbase-0.94.x clients will not be able to talk to a 0.96.x
> cluster. See '3. Upgrading' [5] section in the reference guide for notes on
> upgrading and section '3.2. Upgrading from 0.94.x to 0.96.x' [6] in
> particular. Downstream projects should notice very minor -- if any --
> changes in API.
>
> Thanks to legion who contributed to this release.
>
> At your service,
> The HBase dev team
>
> This release is dedicated to Shaneal Manek, HBase contributor.
>
> 0. http://www.apache.org/dyn/closer.cgi/hbase/
> 1. 0.96.0 http://goo.gl/yp74gU
> 2. 0.95.2 340 issues http://goo.gl/4djjE9
> 3. 0.95.1 265 issues http://goo.gl/TcdckW
> 4. 0.95.0 1263 issues http://goo.gl/Iqcx2i
> 5. http://hbase.apache.org/book.html#upgrading
> 6. http://hbase.apache.org/book.html#upgrade0.96
> 7. http://goo.gl/NKoDqp
> 8. https://code.google.com/p/protobuf/
>
>
> SAMPLE FROM RELEASE NOTES
>
> HBASE-7331 HBASE-6096 Add access control for region open and close, row
> locking, and stopping the regionserver
> HBASE-7678 HBASE-7667 make storefile management pluggable, together with
> compaction
> HBASE-8015 Support for Namespaces
> HBASE-5335 Dynamic Schema Configurations
> HBASE-5939 Add an autorestart option in the start scripts
> HBASE-2214 Do HBASE-1996 -- setting size to return in scan rather than
> count of rows -- properly
> HBASE-9505 Enable replication by default
> HBASE-8766 HBASE-6814 [WINDOWS] bin/hbase.cmd zkcli is broken
> HBASE-4657 Improve the efficiency of our MR jobs with a few configurations
> HBASE-6659 Port HBASE-6508 Filter out edits at log split time
> HBASE-6055 Offline Snapshots in HBase 0.96
> HBASE-7567 [replication] Create an interface for replication peers
> HBASE-5305 Improve cross-version compatibility & upgradeability
> HBASE-9152 Not able to find HMaster and HRegionServer processes with grep
> by process name on ps result because of large classpath as argument.
> HBASE-8778 Region assigments scan table directory making them slow for huge
> tables
> HBASE-7721 Atomic multi-row mutations in META
> HBASE-7007 [MTTR] Study assigns to see if we can make them faster still
> HBASE-7845 optimize hfile index key
> HBASE-7533 HBASE-7898 Write an RPC Specification for 0.96
> HBASE-6553 Remove Avro Gateway
> HBASE-8505 References to split daughters should not be deleted separately
> from parent META entry
> HBASE-50   Snapshot of table
> HBASE-8214 Remove proxy and engine, rely directly on pb generated Service
> HBASE-5844 Delete the region servers znode after a regions server crash
> HBASE-7315 HBASE-7263 Remove support for client-side RowLocks
> HBASE-6135 Style the Web UI to use Twitter's Bootstrap.
> HBASE-4676 Prefix Compression - Trie data block encoding
> HBASE-6295 Possible performance improvement in client batch operations:
> presplit and send in background
> HBASE-4403 Adopt interface stability/audience classifications from Hadoop
> HBASE-7008 Set scanner caching to a better default, disable Nagles
> HBASE-7942 HBASE-4755 Make use of the plumbing in HBASE-7932 to provide
> location hints when region files are created
> HBASE-7835 HBASE-7006 Implementation of the log splitting without creating
> intermediate files
> HBASE-8334 Enable essential column family support by default
> HBASE-6849 Make StochasticLoadBalancer the default
> HBASE-6066 HBASE-6922 some low hanging read path improvement ideas
> HBASE-5074 support checksums in HBase block cache
> HBASE-7351 Periodic health check chore
> HBASE-5887 Make TestAcidGuarantees usable for system testing.
> HBASE-6783 Make read short circuit the default
> HBASE-9529 HBASE-9495 Audit of hbase-client @InterfaceAudience.Public apis
> HBASE-6435 Reading WAL files after a recovery leads to time lost in
> HDFStimeouts when using dead
> datanodes
> HBASE-6206 HBASE-6182 Large tests fail with jdk1.7
> HBASE-9208 ReplicationLogCleaner slow at large scale
> HBASE-5533 Add more metrics to HBase
> HBASE-7306 HBASE-781 [shell] Count shell command to return ruby
> bindablevalue.
> HBASE-7110 refactor the compaction selection and config code similarly to
> 0.89-fb changes
> HBASE-7603 HBASE-7519 refactor storefile management in HStore in order to
> support things like LevelDB-style compactions
> HBASE-8693 HBASE-8089 DataType: provide extensible type API
> HBASE-7932 HBASE-4755 Do the necessary plumbing for the region locations in
> META table and send the info to the RegionServers
> HBASE-6241 HBASE-6201 HBaseCluster interface for interacting with the
> cluster from system tests
> HBASE-8219 Align Offline Merge with Online Merge
> HBASE-9523 HBASE-9495 Audit of hbase-common @InterfaceAudience.Public apis.
> HBASE-8813 Fix time b/w recoverLease invocations from HBASE 8449
> HBASE-7290 Online snapshots
> HBASE-8450 Update hbase-default.xml and general recommendations to better
> suit current hw, h2, experience, etc.
> HBASE-8201 HBASE-8089 OrderedBytes: an ordered encoding strategy
> HBASE-8877 Reentrant row locks
> HBASE-4393 Implement a canary monitoring program
> HBASE-4050 Update HBase metrics framework to metrics2 framework
> HBASE-4391 Add ability to start RS as root and call mlockall
> HBASE-5924 In the client code, don't wait for all the requests to be
> executed before resubmitting a request in error.
> HBASE-7305 ZK based Read/Write locks for table operations
> HBASE-5705 HBASE-5305 Introduce Protocol Buffer RPC engine
> HBASE-5838 Add an LZ4 compression option to HFile
> HBASE-7404 Bucket Cache:A solution about CMS,Heap Fragment and Big Cache on
> HBASE
> HBASE-7590 Add a costless notifications mechanism from master to
> regionservers & clients
> HBASE-9203 Secondary index support through coprocessors
> HBASE-9121 Update HTrace to 2.00 and add new example usage.
>

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