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To reduce the number of write locks, heads are now cached.
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A sync message from a ready peer only completes the initial sync if that
peer has at least one head. A peer with an empty document can no longer
make a joiner ready on an empty store: a misconfigured second swarm, or
a genesis node in its first seconds.
Effect on a brand-new swarm: a joiner now waits until the genesis node
has registered itself in the member list, which happens within about 5 s
of it becoming ready.
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Nodes push changes to their neighbours but don't relay them directly.
In a partial mesh, nodes can learn about missing changes via keepalive
messages and can pull them from their neighbours.
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Don't store encoded messages but retry using a newly generated one.
That way any accumulated changes can be delivered at once.
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The stall breaker was superseded by regular re-handshaking Re-handshaking also
gets triggered, when a node needs some of the heads its peer believes it has
already sent. In that case the peer now resends what's needed.
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Ready nodes will leave the first message to the pear that isn't ready.
Hello and hello reply now carry ready, so readiness is known from the
very first contact, before any sync. Together with the sync messages
and keepalives, reports_ready is always current.
After epoch switch, pings go to everyone except ready members already
on the new epoch, these learn from the lagging peer's opening.
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The handshake resets the session anyway, and the sender's reply timeout
resends what still matters.
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This allows changing sources without the fixed 30 s stall duration.
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Sync messages now carries a ready flag, telling whether the sending peer
itself is joined or is itself still (re-)joining. In the latter case,
the peer won't be used as sync source.
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SyncSession holds all fields that get reset by reset_sync()
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If both sides open, the openings cross, and an empty node's answer to
the other opening (empty heads) makes the other side send the whole
document a second time.
Now after a sync reset, only the side with the smaller public key opens
the sync; the other answers it, or opens itself if nothing arrives.
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When an sync messages arrives and automerge has nothing to say about it,
then no reply is generated. With c9279e4 it was assumed that every sync
message gets an answer, so missing replies caused unnecessary resends.
Now a reply is only awaited if the peer's last reported heads differ
from ours. If the peer's heads become equal through a third peer without
replying, the waiting will also abort if a ping or pong showss the same
heads digest on both sides.
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