Move enable_shared_from_this to the concrete create_keyspace_statement
class to make sure prepare() instantiates the right type. Fixes "pure
virtual method called" errors when calling create_keyspace_statement
methods that are pure virtual in the base class.
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>
It makes more sense to put the helper near class gossip_digest not class
gossip_digest_syn. The helper is used by class gossip_digest_ack as
well. The moving makes the including more clear.
Implements a cassandra-file-compatible segmented log
of "mutations". Handles "batch" and "periodic" mode like
stock version. Also includes "dirty" management for the
interaction log/memtable.
Supports:
* add
* sync/flush
* clear dirty bits (thus discarding segments)
Many more estoric stock functions not yet implemented.
Missing: Storage management. Does not deal with total
size on disk of segments yet. Nor does it have any provisions
for dealing with active buffer bloat should async writes stall.
[avi: adjust for future<>::rescue() removal]
Signed-off-by: Calle Wilund <calle@cloudius-systems.com>
Add "finally" continuation overload for functions returning future type that
awaits finishing the continuation in question before continuing the "present"
one. I.e. a wrapper around "then_wrapped" to remove the need to deal with the
original return value.
Signed-off-by: Calle Wilund <calle@cloudius-systems.com>
Basic explanation of the reclaimer algorithm:
- Each slab page has a descriptor containing information about it, such as
refcnt, vector of free objects, link into LRU, etc.
- The LRU list will only contain slab pages which items are unused, so as
to make the reclaiming process faster and easier. Maintaining the LRU of slab
pages has a performance penalty of ~1.3%. Shlomi suggested an approach where
LRU would no longer exist and timestamp would be used instead to keep track of
recency. Reclaimer would then iterate through all slab pages checking for an
unused slab page with the lowest timestamp.
- Reclaimer will get the least-recently-used slab page from the LRU list,
do all the management stuff required, and iterate through the page erasing any
of the items there contained. Once reclaimer was called, it's likely that slab
memory usage is calibrated, thus slab pages shouldn't be allocated anymore.
- Reclaimer is enabled by default but can be disabled by specifying the slab
size using the application parameter --max-slab-size.
Signed-off-by: Raphael S. Carvalho <raphaelsc@cloudius-systems.com>
input_stream's constructor had an unused buf_size parameter. Such a
parameter is not needed - whenever the input_stream needs more
data it calls the underlying data_source's get(), and thus only the
data_source gets to decide the buffer size. Moreover, in some
implementations, this read buffer size will be different each time -
e.g., in a chunk-compressed file, the uncompressed chunk's size will
be different each time.
Signed-off-by: Nadav Har'El <nyh@cloudius-systems.com>
We use bytes for many different things, and it is easy to get confused as
to what format the data is actually in.
Fix that for atomic_cell by proving wrappers. atomic_cell::one corresponds
to a bytes object holding exactly one atomic cell, and atomic_cell::view is
a bytes_view to an atomic_cell. The static functions of atomic_cell itself
are privatized to prevent the unwashed masses from using them on the wrong
objects.
Since a row entry can hold either a an atomic cell, or a collection,
depending on the schema, also introduce a variant type
atomic_cell_or_collection and allow the user to pick the type explicitly.
Internally both are stored as bytes object.
Implement "double" and "float" cql types.
This implementation doesn't touch serialization.hh (which should be
eventually removed) and rather follows the other examples in types.cc.
It is relatively ugly, because of all the cleverness of our "general"
byte swapping implementation actually works only for integer types, and
we need to get it to work for float/double as well.
Signed-off-by: Nadav Har'El <nyh@cloudius-systems.com>
Left some of the stuff I got tired of converting in #if 0. Most likely
I'll need them later, and convert them then.
Signed-off-by: Nadav Har'El <nyh@cloudius-systems.com>
The schema_altering_statement class must implement
cql_statement::uses_function() to be instantiable.
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>
