instead of 300, request a random length of shares so that it always e…

…ventually gets past a too-large chunk of the sharechain

p2pool/node.py

@@ -110,7 +110,7 @@ def download_shares():
                 try:
                     shares = yield peer.get_shares(
                         hashes=[share_hash],
-                        parents=300-1,
+                        parents=random.randrange(500), # randomize parents so that we eventually get past a too large block of shares
                         stops=list(set(self.node.tracker.heads) | set(
                             self.node.tracker.get_nth_parent_hash(head, min(max(0, self.node.tracker.get_height_and_last(head)[0] - 1), 10)) for head in self.node.tracker.heads
                         ))[:100],