Github user keith-turner commented on a diff in the pull request:
https://github.com/apache/accumulo/pull/176#discussion_r85754159
--- Diff: _posts/blog/2016-10-28-durability-performance.md ---
@@ -0,0 +1,136 @@
+---
+title: "Durability Performance Implications"
+date: 2016-10-28 17:00:00 +0000
+author: Keith Turner
+---
+
+## Overview
+
+Accumulo stores recently written data in a sorted in memory map. Before
data is
+added to this map, it's written to an unsorted WAL (write ahead log). In
the
+case when a Tablet Server dies, the recently written data is recovered
from the
+WAL.
+
+When data is written to Accumulo the following happens :
+
+ * Client sends a batch of mutations to a tablet server
+ * Tablet server does the following :
+ * Writes mutation to Tablet Servers WAL
+ * Sync or flush WAL
+ * Adds mutations to sorted in memory maps
--- End diff --
made updates in f5d8401
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