when the status thread is enabled. This tracks the GC count, thread count,
memory used and average system load (if implemented) over time as well as
the max and min for each measurement at the end.
Also, every run will now measure the total number of garbage collections
from all pools.

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.

Fixed nits suggested by @busbey

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.

Added zeropadding parameter for specifing the number of 0s to left pad the recordnumber. Usefull when using string sort order
Added insertstart and insertcount parameters to run in parallel

Introduce an "ordered" distribution which uses sequential numbers

These will be used for #653 to write timestamps and numeric values
to the ByteIterator maps.

Fixes #320

Fixes #604

- define checkstyle configs in as few places as possible
- use checkstyle:check since it has defaults that match what we want (fail after logging to console)
- modules that have current failures set property checkstyle.failOnViolation to false.

updating readme

updating package info

perfecting logic for http solr clients for all operations

renamed properties, tested cloud mode and cleaned code

removed dependency on dynamic field names, updated readme

now enforcing checkstyle

adding solr artifact

removing test cases relying on external dependencies

removed unused maven dependencies, added batch mode support, all try blocks now catch eplicit exceptions, Query/UpdateResponse status codes are handled more granularly, updated readme, added sample schema.xml file to support default field names in ycsb client, updated all license headers to 2016, using SolrClient object as primary client type regardless if Solr is running in Cloud or Stand-alone mode

cleaned code and config files, now accepting a solr base url property, simplified sample schema.xml file, renamed class to SolrClient, now updating documents atomically, added batch support to delete method

updated new line spacing of pom file comments

removed sample schema file, updated readme with more indepth explanation on running/setting up the solr-binding

removed some code lines no longer in use

renamed zookeeper param name, now throwing caught exceptions where appropriate, debug messages are now being logged on stderr

now returning an appropriate error if we receive an unexpected response from solr server, repeated calls to getResults is no longer

now using singletonMap to store update params in, fixed typo and missing id field in sample config in README

[core, Cassandra, gemfire, mapkeeper] Fixing squid:S2864 -  "entrySet()" should be iterated when both the key and value are needed

[core dynamodb googledatastore infinispan] Fixing pmd:UnnecessaryConstructor - Unnecessary constructor, squid:EmptyStatementUsageCheck - Empty statements should be removed

[core accumulo couchbase memcached] Fixing squid:S1155 - Collection.isEmpty() should be used to test for emptiness

Prefix the retry limit property name with core_workload.

[core] Incorporate CR Feedback

Prefix the retry limit property with "core_workload".

The default behavior is NO RETRY, which is the current behavior.

But optionally user can enable retry if they are working with a DB backend that is better tolerated by allowing a few retries.

- Remove trailing whitespaces,
- Break longlines to below 120 chars
- Right indentation.

This is to prepare for the next commit that will add retry logic to insert to make the load process more fault tolerant.

Define constants for the property strings.

- Move the doc (code comment) to workload_template
- Minor changes in propery parsing logic and log to System.Err;

[core] Incoporate CR comment

Missed one comment before.

And make it configurable.

Specifically:

1. Remove trailing spaces,
2. Replace TAB with spaces,
3. Break lines > 80 characters
4. Misc code alignment.

No functional code change. use ?w=1 on the URL to view non-whitespace changes.

When dataintegrity and readallfields are both true, pass the full field
set to db.read() so that the field values can be verified.

Fixes #496

Changed measurement latency to actual latency time of the verifyRow step
and now recording Status codes for verify operations.

Fixes #479

Also fix a few README formatting issues.

        mvn org.apache.rat:apache-rat-plugin:0.11:check -D rat.numUnapprovedLicenses=5000

1. Use LinkedList rather than ArrayList for the measurement array in RAW. Update size estimation in documentation in workload_template.

2. Add a new composite measurement type which combines HdrHistogram and RAW.

3. Allow user to optionally disable output of summary stats from the raw measurement class.

Replaces numeric status codes with a canonical set of Status objects,
each with a short name and description.
Bindings with more specific errors (e.g., timeouts) return additional
statuses.

This changes the default output from messages like:

   [UPDATE], Return=0, 511

To:

   [UPDATE], Return=OK, 511