accumulo

In many places in Gaffer, correct logging string formatting is used:
https://github.com/gchq/Gaffer/blob/fb63fc25be2f01d6476d1010780500cb0856b6c4/store-implementation/accumulo-store/src/main/java/uk/gov/gchq/gaffer/accumulostore/operation/hdfs/handler/AddElementsFromHdfsHandler.java#L254

However, in some places, string concatenation is incorrectly used instead:
https://github.com/gchq/Gaffer/

The property name general.server.simpletimer.threadpool.size is old and doesn't really make sense anymore with the refactoring of ThreadPools class. I am wondering if we should rename it. Maybe something like general.server.threadpool.size. The SimpleTimer class has been dropped.

https://github.com/apache/accumulo/blob/12fde7ec38c485acefa162ec0dfb6a73919fd576/core/src/main/java/org/apache

The JexlNodes class offers the method children(T node, JexlNode... children) for general purpose setting of children.

Add a new method with signature children(T node, Collection<JexlNode> children)

Adding smoke-test scripts to Uno that can run in TravisCI and verify Accumulo and Fluo start and work would be a really nice check to have for PRs. Not sure if this is possible though.

The compaction strategy example should be updated to reflect the recent changes to compaction configuration in accumulo. Including the description of the strategies and the example configuration given.
Example below of what could be added to replace the current example (this is found I'm accumulo-testing)

tserver.compaction.major.service.cs1.planner=org.apache.accumulo.core.spi.compactio

... anywhere

Newly added logger features [1], with an example [2,3]

[1] https://github.com/phrocker/sharkbite/blob/master/include/logging/Logger.h
[2] https://github.com/phrocker/sharkbite/blob/master/src/interconnect/TabletServer.cpp#L30
[3] https://github.com/phrocker/sharkbite/blob/master/src/interconnect/TabletServer.cpp#L51

PR apache/accumulo#2171 renamed WALOG properties to be WAL instead. There are a few instances inside accumulo-testing that use the deprecated WALOG variant that should be replaced by the WAL counterpart (see #147 as an example of such issue).

Original Jira ticket: https://issues.apache.org/jira/browse/ACCUMULO-2469

The Jira ticket mentions the steps though I have not verified if that is still accurate or if it could be improved upon.