* initial check-in of working auto block size tuning for import. Needs clean-up.
* partial fix in this branch to enable testing, awaiting better fix in different branch.
* move pacing code from findIdleSender to AutoTuneThread object.
* move pacing code from findIdleSender to AutoTuneThread object. clean up dead code. add comments about algorithm.
* edits to algorithm discussion
* correct logging level. add CHANGELOG entry.
* update comment concerning proper usage of shutdown()
* initialize new static member MaxBatchSize. Correct sendCsvBuffer() call to addPeriodByteCount() since _outputBuffer drained by sendData().
* remove redundant semicolons. add new static member MaxBatchSize.
* move MaxBatchSize to ImportHelper so both ImportFeature object and AutoTuneThread object can access it.
* minor updates to comments and statics
* add pacing discussion to import manual page
* minor edit
* forward-port AQL optimizations from 3.3
* fix restrict-to-single-shard rule
* added tests for specific cases
* ModificationNodes now can know if they are restricted or not
* OptimizerRule now updates the ModificationNode instead of setting ownName on remote node.
* The DBServerEngine container now only sends a subset of snippets (those which are relevant) It is able to restrict any part of the query to a certain shard or even a list of shards
* ExecutionEngine CreateBlocks in ClusterMode now returns Result instead of throwing.
* Adapted Coordinator side to a bitter mapping of RemoteNode => QuerySnippets. This is still ongoing work.
* Fixed Coordinator enginecontainer test and finisehd implementation of EngineInfoContainerDBServer. Seems to work so far, need to adapt test to prove it.
* Adapted test for modification nodes and restrict to shard.
* restrictTo can now be de-/serialized on Modification Nodes
* Fixed Community Compile Error
* Added a test for Indexes/EnumerateCollection nodes
* EnumerateCollection and IndexNode now have options to be restricted to a single shard, opt rule not yet updated
* DBServer part of planning now checks Enumerate and IndexNodes for single shard optimization
* Added tests for simple single shard optimization on IndexNodes
* Adapted optimzierrule for SingleShard optimierung on IndexNodes
* Fixed an issue with externally restricted shard ids in combination with shard_id based optimization
* Added a test for multiple single shard optimizations on the same collection
* Removed collection/Shard duplicate check of optimize to single shard rules
* Updated Explainer to handle optimize to single shard
* Let more tests pass an optimized AQL variant
* Temporarily disabled a tests that can only be solved after some work in transaction
* Fixing subqueries in aql profiler
* Adding additional testsuite
* Fix AQL profiling example name, add API example
Also use different query for explain and profiling with SLEEP() for
non-zero runtimes.
* New/updated examples for query explain/profiling
* Fix runtime calculation