[config] Remove blockmaxsize option

The blockmaxsize option was marked as deprecated in V0.15.1, and code
was added to convert provided blockmaxsize into blockmaxweight. However,
this code was incorrectly implemented, and blockmaxsize was silently
ignored.

No users have complained about blockmaxsize being ignored, so just
remove it in V0.17.

doc/release-notes.md

@@ -98,6 +98,14 @@ Low-level RPC changes
 
 - The log timestamp format is now ISO 8601 (e.g. "2018-02-28T12:34:56Z").
 
+Miner block size removed
+------------------------
+
+The `-blockmaxsize` option for miners to limit their blocks' sizes was
+deprecated in V0.15.1, and has now been removed. Miners should use the
+`-blockmaxweight` option if they want to limit the weight of their blocks'
+weights.
+
 Credits
 =======
 

src/init.cpp

@@ -491,8 +491,6 @@ std::string HelpMessage(HelpMessageMode mode)
     strUsage += HelpMessageOpt("-whitelistrelay", strprintf(_("Accept relayed transactions received from whitelisted peers even when not relaying transactions (default: %d)"), DEFAULT_WHITELISTRELAY));
 
     strUsage += HelpMessageGroup(_("Block creation options:"));
-    if (showDebug)
-        strUsage += HelpMessageOpt("-blockmaxsize=<n>", "Set maximum BIP141 block weight to this * 4. Deprecated, use blockmaxweight");
     strUsage += HelpMessageOpt("-blockmaxweight=<n>", strprintf(_("Set maximum BIP141 block weight (default: %d)"), DEFAULT_BLOCK_MAX_WEIGHT));
     strUsage += HelpMessageOpt("-blockmintxfee=<amt>", strprintf(_("Set lowest fee rate (in %s/kB) for transactions to be included in block creation. (default: %s)"), CURRENCY_UNIT, FormatMoney(DEFAULT_BLOCK_MIN_TX_FEE)));
     if (showDebug)
@@ -798,15 +796,6 @@ void InitParameterInteraction()
         if (gArgs.SoftSetBoolArg("-whitelistrelay", true))
             LogPrintf("%s: parameter interaction: -whitelistforcerelay=1 -> setting -whitelistrelay=1\n", __func__);
     }
-
-    if (gArgs.IsArgSet("-blockmaxsize")) {
-        unsigned int max_size = gArgs.GetArg("-blockmaxsize", 0);
-        if (gArgs.SoftSetArg("blockmaxweight", strprintf("%d", max_size * WITNESS_SCALE_FACTOR))) {
-            LogPrintf("%s: parameter interaction: -blockmaxsize=%d -> setting -blockmaxweight=%d (-blockmaxsize is deprecated!)\n", __func__, max_size, max_size * WITNESS_SCALE_FACTOR);
-        } else {
-            LogPrintf("%s: Ignoring blockmaxsize setting which is overridden by blockmaxweight", __func__);
-        }
-    }
 }
 
 static std::string ResolveErrMsg(const char * const optname, const std::string& strBind)

src/miner.cpp

@@ -68,9 +68,7 @@ BlockAssembler::BlockAssembler(const CChainParams& params, const Options& option
 static BlockAssembler::Options DefaultOptions(const CChainParams& params)
 {
     // Block resource limits
-    // If neither -blockmaxsize or -blockmaxweight is given, limit to DEFAULT_BLOCK_MAX_*
+    // If -blockmaxweight is not given, limit to DEFAULT_BLOCK_MAX_WEIGHT
-    // If only one is given, only restrict the specified resource.
-    // If both are given, restrict both.
     BlockAssembler::Options options;
     options.nBlockMaxWeight = gArgs.GetArg("-blockmaxweight", DEFAULT_BLOCK_MAX_WEIGHT);
     if (gArgs.IsArgSet("-blockmintxfee")) {

test/functional/feature_fee_estimation.py

@@ -133,8 +133,8 @@ class EstimateFeeTest(BitcoinTestFramework):
         which we will use to generate our transactions.
         """
         self.add_nodes(3, extra_args=[["-maxorphantx=1000", "-whitelist=127.0.0.1"],
-                                      ["-blockmaxsize=17000", "-maxorphantx=1000"],
+                                      ["-maxorphantx=1000"],
-                                      ["-blockmaxsize=8000", "-maxorphantx=1000"]])
+                                      ["-maxorphantx=1000"]])
         # Use node0 to mine blocks for input splitting
         # Node1 mines small blocks but that are bigger than the expected transaction rate.
         # NOTE: the CreateNewBlock code starts counting block size at 1,000 bytes,

test/functional/feature_maxuploadtarget.py

@@ -34,7 +34,7 @@ class MaxUploadTest(BitcoinTestFramework):
     def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 1
-        self.extra_args = [["-maxuploadtarget=800", "-blockmaxsize=999000"]]
+        self.extra_args = [["-maxuploadtarget=800"]]
 
         # Cache for utxos, as the listunspent may take a long time later in the test
         self.utxo_cache = []
@@ -144,7 +144,7 @@ class MaxUploadTest(BitcoinTestFramework):
         #stop and start node 0 with 1MB maxuploadtarget, whitelist 127.0.0.1
         self.log.info("Restarting nodes with -whitelist=127.0.0.1")
         self.stop_node(0)
-        self.start_node(0, ["-whitelist=127.0.0.1", "-maxuploadtarget=1", "-blockmaxsize=999000"])
+        self.start_node(0, ["-whitelist=127.0.0.1", "-maxuploadtarget=1"])
 
         # Reconnect to self.nodes[0]
         self.nodes[0].add_p2p_connection(TestP2PConn())

test/functional/feature_pruning.py

@@ -31,14 +31,14 @@ class PruneTest(BitcoinTestFramework):
 
         # Create nodes 0 and 1 to mine.
         # Create node 2 to test pruning.
-        self.full_node_default_args = ["-maxreceivebuffer=20000","-blockmaxsize=999000", "-checkblocks=5", "-limitdescendantcount=100", "-limitdescendantsize=5000", "-limitancestorcount=100", "-limitancestorsize=5000" ]
+        self.full_node_default_args = ["-maxreceivebuffer=20000", "-checkblocks=5", "-limitdescendantcount=100", "-limitdescendantsize=5000", "-limitancestorcount=100", "-limitancestorsize=5000" ]
         # Create nodes 3 and 4 to test manual pruning (they will be re-started with manual pruning later)
         # Create nodes 5 to test wallet in prune mode, but do not connect
         self.extra_args = [self.full_node_default_args,
                            self.full_node_default_args,
                            ["-maxreceivebuffer=20000", "-prune=550"],
-                           ["-maxreceivebuffer=20000", "-blockmaxsize=999000"],
+                           ["-maxreceivebuffer=20000"],
-                           ["-maxreceivebuffer=20000", "-blockmaxsize=999000"],
+                           ["-maxreceivebuffer=20000"],
                            ["-prune=550"]]
 
     def setup_network(self):
@@ -124,7 +124,7 @@ class PruneTest(BitcoinTestFramework):
         # Reboot node 1 to clear its mempool (hopefully make the invalidate faster)
         # Lower the block max size so we don't keep mining all our big mempool transactions (from disconnected blocks)
         self.stop_node(1)
-        self.start_node(1, extra_args=["-maxreceivebuffer=20000","-blockmaxsize=5000", "-checkblocks=5", "-disablesafemode"])
+        self.start_node(1, extra_args=["-maxreceivebuffer=20000","-checkblocks=5", "-disablesafemode"])
 
         height = self.nodes[1].getblockcount()
         self.log.info("Current block height: %d" % height)
@@ -147,7 +147,7 @@ class PruneTest(BitcoinTestFramework):
 
         # Reboot node1 to clear those giant tx's from mempool
         self.stop_node(1)
-        self.start_node(1, extra_args=["-maxreceivebuffer=20000","-blockmaxsize=5000", "-checkblocks=5", "-disablesafemode"])
+        self.start_node(1, extra_args=["-maxreceivebuffer=20000","-checkblocks=5", "-disablesafemode"])
 
         self.log.info("Generating new longer chain of 300 more blocks")
         self.nodes[1].generate(300)