Github user d2r commented on a diff in the pull request:
https://github.com/apache/storm/pull/838#discussion_r45128439
--- Diff: docs/documentation/Pacemaker.md ---
@@ -0,0 +1,89 @@
+# Pacemaker
+
+### Introduction
+Pacemaker is a storm daemon designed to process heartbeats from workers.
As Storm is scaled up, ZooKeeper begins to become a bottleneck due to high
volumes of writes from workers doing heartbeats. Lots of writes to disk and
traffic across the network is generated as ZooKeeper tries to maintain
consistency.
--- End diff --
`Lots of writes to disk and lots of traffic`...
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