This commit modifies the Elasticsearch client to return Status.NOT_FOUND
when an operation fails because the document requested does not
exist. This modifies the previous behavior which would return
Status.ERROR in this case.

This commit also moves the statements that would return Status.ERROR
into the corresponding catch blocks so that it is clear that
Status.ERROR is only being returned on error paths.

[googledatastore] Update googledatastore API version to v1beta3.

[asynchbase] Fix Netty library version issue that prevents it from

loading outside the unit tests.

[asynchbase] Add AsyncHBase as an alternative to the default HBase cl…

Note the Guava classes in the test directory for AsyncHBase. These are there
as AsyncHBase uses Guava >= 18 while HBase and the mini cluster use Guava 12.

[core] Add an incrementing printable string generator.

This will be used for #653 for databases that require keys or other values to use a limited character set. This generator will create a sequence of strings using a defined list of UTF code points from which to pull.

[riak] Added new binding for Riak, based on the one created by Basho Technol…

[core] Add CoreWorkload.createOperationGenerator() for use in other w…

[couchbase2] Allow to log latency & runtime metrics.

[riak] R, W, etc. options are ignored for strong-consistent updates. So, it's useless to specify them.
[riak] Updated README.md with new considerations about benchmarks which use strong consistency model.

This changeset adds 2 config params which can be tweaked to enable
and print both the network latency and runtime metrics to the
configured logger.

[riak] Configured RiakKVClientTest.java to work with default bucket-type instead of creating a new one.

[travis] Added riak-admin commands to create and activate test bucket.

[riak] Added RiakKVClientTest.java

[riak] Added test unit.
[riak] Set eventual consistency as default in both README.md and riak.properties file, as strong consistency it's not the main model adopted by the db (check http://docs.basho.com/riak/kv/2.1.4/developing/app-guide/strong-consistency/ for further info).
[riak] Fixed getFields() function by transforming it into createResultHashMap(). This function creates the HashMap to give as result appropriately.
[riak] Removed scan transaction support for strong consistency model. 2i search is not allowed for this model, neither there is a suitable search mean to use to achieve a proper scan transaction.
[riak] Done minor fixes to code and comments.

Updated top level README for YCSB 0.8.0 release

[build] Added Oracle JDK 8 to .travis.yml

[riak] Done some code/comments cleanup.

[riak] Removed test unit as it only works with a local cluster installation (there is no Riak test or mock utility).
[riak] Packaged into com.yahoo.ycsb.db.riak.
[riak] Removed unused dependencies.
[riak] Bugfix for update() function that returned positive even with no nodes in the cluster.

[hbase10] Still too many threads #691.

[googlebigtable] Fix #697 by synchronizing on the static Config object

who's address does not change.

[hbase098] Add missing `writebuffersize` documentation and note to

[hbase10] Add instructions for testing against Google BigTable's HBase API.

[couchbase2] Add Support for Couchbase SDK 2.x

Eventually it would be nice to move this out into a proper generator with enums to
save space, but as users may have extended CoreWorkload and could be using the
"operationchooser" field, we'll just break it out into a static function so as to
avoid breaking anyone's code.

modify hbase-site.xml

Add documentation on how to use the hbase10 client with Google's
Bigtable.