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Split up "context" (the instance of the sds-keyval service) and
"database" (a specific collection of keys and values).

Furthermore, teach 'group' about this split.  Now a 'group' is a
collection of one context and one or more databases.

fixes #5 and #6
fully fixes #7

server-oriented code needs a few more libraries than client-side.
Should fix Matthieu's build problem where boost was not propigated up to
mobject.

one purpose of the alternate backends is to get us building when we
don't have gcc5 or newer.  If we always build bwtree, then we're not
helping things.  Now BwTree is only built if it's the selected backend

C compilers on bebop are still c99 by default.

bebop machine (centos 7) has automake 1.13.4 by default.  Should be good
enough for us.

Fix BerkeleyDB interface implementation to be multithread tolerant. Added simple ABT_mutex in kv-server to protect access to the 2 datastore related global variables in open_handler. Successfully tested with ParSplice.

split up header into public and private/internal versions.

Fixes: #4

populaing a "kv_config.h" makes it easier to inspect what configure
thinks it found vs. looking through compiler command lines.

since BwTree is an optional backend, the BwTree flags should be selected
at configure time

these small wrappers around margo init/finalize aren't helpful when
compositing with multiple services

also lets us use strange/specific CXXFLAGS only when needed

only the spack package provides a pkgconfig file.  for other leveldb
installations we'll have to check for headers ourselves.

populaing a "kv_config.h" makes it easier to inspect what configure
thinks it found vs. looking through compiler command lines.

David Rich authored Nov 20, 2017 and Rob Latham committed Nov 22, 2017

Add simple API for sending/receiving SSG ID and update test-mpi-group. The test-mpi-group app also has an example of how OID might be calculated when key is not already a hashed uint64_t value. Tested on Darwin.

David Rich authored Nov 17, 2017 and Rob Latham committed Nov 22, 2017

Build/test fixups. Note that there are 2 workarounds in place so test-mpi-group terminates cleanly: the ssg_finalize in the kv-server shutdown_handler and the commented out margo_finalize in the kvgroup_client_deregister function.

David Rich authored Nov 17, 2017 and Rob Latham committed Nov 22, 2017

First cut at adding distributed support. Implemented as separate client/server libs for now. Required some tweaking of the keyval API (see sds-keyval.h). May not compile yet.

David Rich authored Nov 02, 2017 and Rob Latham committed Nov 22, 2017

Fixup parallel build issue and add test-client and test-server to the set of tests built automatically.