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The legacy bucket DB initialization logic was designed for the case
where bucket information was spread across potentially millions of
files residing on spinning rust drives. It was therefore async and
running in parallel with client operations, adding much complexity
in order to deal with a myriad of concurrency edge cases.
Replace this with a very simple, synchronous init method that expects the
provider to have the required information readily and cheaply available.
This effectively removes the concept of a node's "initializing" state,
moving directly from reported state Down to Up.
Even though a node still technically starts up in Initializing state,
we never end up reporting this to the Cluster Controller as the DB init
completes before the RPC server stack is set up.
Legacy bucket DB initializer code will be removed in a separate pass.
Also simplify bucket DB interface contract for mutating iteration,
indicating that it is done in an unspecified order.
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This is the first stage of removing the legacy DB implementation.
Support for B-tree specific functionality such as lock-free snapshot
reads will be added soon. This commit is just for feature parity.
Abstract away actual database implementation to allow it to
be chosen dynamically at startup. This abstraction does incur
some overhead via call indirections and type erasures of callbacks,
so it's likely it will be removed once the transition to the
new B-tree DB has been completed.
Since the algorithms used for bucket key operations is so similar
between the content node and distributor, a generic B-tree backed
bucket database has been created. The distributor DB will be rewritten
around this code very soon.
Due to the strong coupling between bucket locking and actual DB
implementation details, the new bucket DB has a fairly significant
code overlap with the legacy implementation. This is to avoid
spending time abstracting away and factoring out code for a
legacy implementation that is to be removed entirely anyway.
Remove existing LockableMap functionality not used or that's
only used by tests.
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Move test config helpers out of cppunit submodule.
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Still some residual vdstestlib CppUnit traces that will need
cleaning up later.
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- Move htmltable code to implementation file and add add override.
- No virtual on override.
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