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* Query Interface Adjustments/Refactoring
Began the process of adjusting the query interface (and also the shard
interface, to a lesser degree) to better accommodate the user. In
particular the following changes have been made,
1. The number of necessary template arguments for the query type
has been drastically reduced, while also removing the void pointers
and manual delete functions from the interface.
This was accomplished by requiring many of the sub-types associated
with a query (parameters, etc.) to be nested inside the main query
class, and by forcing the SHARD type to expose its associated
record type.
2. User-defined query return types are now supported.
Queries no longer are required to return strictly sets of records.
Instead, the query now has LocalResultType and ResultType
template parameters (which can be defaulted using a typedef in
the Query type itself), allowing much more flexibility.
Note that, at least for the short term, the LocalResultType must
still expose the same is_deleted/is_tombstone interface as a
Wrapped<R> used to, as this is currently needed for delete
filtering. A better approach to this is, hopefully, forthcoming.
3. Updated the ISAMTree.h shard and rangequery.h query to use the
new interfaces, and adjusted the associated unit tests as well.
4. Dropped the unnecessary "get_data()" function from the ShardInterface
concept.
5. Dropped the need to specify a record type in the ShardInterface
concept. This is now handled using a required Shard::RECORD
member of the Shard class itself, which should expose the name
of the record type.
* Updates to framework to support new Query/Shard interfaces
Pretty extensive adjustments to the framework, particularly to the
templates themselves, along with some type-renaming work, to support
the new query and shard interfaces.
Adjusted the external query interface to take an rvalue reference, rather
than a pointer, to the query parameters.
* Removed framework-level delete filtering
This was causing some issues with the new query interface, and should
probably be reworked anyway, so I'm temporarily (TM) removing the
feature.
* Updated benchmarks + remaining code for new interface
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Note: this requires the caller to manage the memory of the strings
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Necessary updates to get the codebase building under OpenBSD 7.5 with
clang. This is a minimal set of changes to get building to work, which
includes disabling several things that aren't directly compatable. More
work will be necessary to get full functionality. In particular, Triespline,
PGM, and the reference M-tree do not currently build on OpenBSD with clang
due to GNU dependencies or other gcc specific features.
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Needs some debugging--some methods currently fail within the library
itself.
The build system doesn't currently build the FST library. To compile,
you'll first need to manually build it, and then place the libFST.so file
in your LIBRARY_PATH and LD_LIBRARY_PATH.
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The reconstruction task procedure can now simulate future reconstructions
to a specified depth.
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The high watermark and low watermark can now be equal, to allow for
blocking reconstruction without requiring odd buffer sizes.
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Added a ReconVector type to make it easier to do load balancing by
shifting tasks around, and clean up a few interfaces.
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This approach should allow us to "simulate" a reconstruction to monitor
the future state of the structure. The idea being that we can then add
pre-emptive reconstructions to load balance and further smooth the tail
latency curve. If a given reconstruction is significantly smaller than
the next one will be, we can move some of the next one's work preemptively
into the current one.
The next phase is to do the simulation within the scratch_vector and
then do a second pass examining the state of that reconstruction. In
principle, we could look arbitrarily far ahead using this technique.
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I'm reasonably certain that this is a compiler bug...
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Cleaned up shard implementations, fixed a few bugs, and set up some
tests. There's still some work to be done in creating tests for the
weighted sampling operations for the alias and aug btree shards.
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