This commit fixes#810 and adds block streaming to the final destinations when
adding. This should add major performance gains when adding data to clusters.
Before, everytime cluster issued a block, it was broadcasted individually to
all destinations (new libp2p stream), where it was block/put to IPFS (a single
block/put http roundtrip per block).
Now, blocks are streamed all the way from the adder module to the ipfs daemon,
by making every block as it arrives a single part in a multipart block/put
request.
Before, block-broadcast needed to wait for all destinations to finish in order
to process the next block. Now, buffers allow some destinations to be faster
than others while sending and receiving blocks.
Before, if a block put request failed to be broadcasted everywhere, an error
would happen at that moment.
Now, we keep streaming until the end and only then report any errors. The
operation succeeds as long as at least one stream finished successfully.
Errors block/putting to IPFS will not abort streams. Instead, subsequent
blocks are retried with a new request, although the method will return an
error when the stream finishes if there were errors at any point.
This commit introduces the new go-libp2p-gorpc streaming capabilities for
Cluster. The main aim is to work towards heavily reducing memory usage when
working with very large pinsets.
As a side-effect, it takes the chance to revampt all types for all public
methods so that pointers to static what should be static objects are not used
anymore. This should heavily reduce heap allocations and GC activity.
The main change is that state.List now returns a channel from which to read
the pins, rather than pins being all loaded into a huge slice.
Things reading pins have been all updated to iterate on the channel rather
than on the slice. The full pinset is no longer fully loaded onto memory for
things that run regularly like StateSync().
Additionally, the /allocations endpoint of the rest API no longer returns an
array of pins, but rather streams json-encoded pin objects directly. This
change has extended to the restapi client (which puts pins into a channel as
they arrive) and to ipfs-cluster-ctl.
There are still pending improvements like StatusAll() calls which should also
stream responses, and specially BlockPut calls which should stream blocks
directly into IPFS on a single call.
These are coming up in future commits.
This does 3 things:
- Add a NoPin option to the adder. When set to true, the adding process does not
send a pin in the end.
- When user-allocations are set and local=true happens, we do not overwrite
the allocations returned by the allocator to include the local peer
anymore, as this could alter user-allocations.
- Some code improvement (remove pointers).
Local dagservice is not really a local as it add to other peers as well.
It is a dagservice that does not perform sharding. Since we are going to
have a local dagservice(one that adds only to the local peer), renaming
this `single` dagservice
