mempool: max size and logs.

lib/bcoin/mempool.js

@@ -716,8 +716,10 @@ Mempool.prototype.removeUnchecked = function removeUnchecked(entry, limit) {
   // being removed for a block. The spenders
   // are still spending valid coins (which
   // now exist on the blockchain).
-  if (limit)
+  if (limit) {
     this._removeSpenders(entry);
+    this.logger.debug('Evicting %s from the mempool.', tx.rhash);
+  }
 
   this.untrackEntry(entry);
 

lib/bcoin/protocol/constants.js

@@ -461,7 +461,7 @@ exports.mempool = {
    * Maximum mempool size in bytes.
    */
 
-  MAX_MEMPOOL_SIZE: 300 * 1000000,
+  MAX_MEMPOOL_SIZE: 100 * 1000000,
 
   /**
    * The time at which transactions