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From els...@apache.org
Subject [2/2] accumulo-website git commit: Jekyll build from master:fa21326
Date Mon, 06 Mar 2017 23:02:44 GMT
Jekyll build from master:fa21326

Fix the date on the security peformance post


Project: http://git-wip-us.apache.org/repos/asf/accumulo-website/repo
Commit: http://git-wip-us.apache.org/repos/asf/accumulo-website/commit/ccd797a9
Tree: http://git-wip-us.apache.org/repos/asf/accumulo-website/tree/ccd797a9
Diff: http://git-wip-us.apache.org/repos/asf/accumulo-website/diff/ccd797a9

Branch: refs/heads/asf-site
Commit: ccd797a958c0a1a602d4fd91d391904e5b982ec7
Parents: 803c95d
Author: Josh Elser <elserj@apache.org>
Authored: Mon Mar 6 18:02:21 2017 -0500
Committer: Josh Elser <elserj@apache.org>
Committed: Mon Mar 6 18:02:21 2017 -0500

----------------------------------------------------------------------
 .../23/security-performance-implications.html   | 449 -------------------
 .../06/security-performance-implications.html   | 449 +++++++++++++++++++
 feed.xml                                        | 352 +++++++--------
 index.html                                      |   6 +-
 news/index.html                                 |   8 +-
 5 files changed, 632 insertions(+), 632 deletions(-)
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http://git-wip-us.apache.org/repos/asf/accumulo-website/blob/ccd797a9/blog/2017/02/23/security-performance-implications.html
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diff --git a/blog/2017/02/23/security-performance-implications.html b/blog/2017/02/23/security-performance-implications.html
deleted file mode 100644
index fd23824..0000000
--- a/blog/2017/02/23/security-performance-implications.html
+++ /dev/null
@@ -1,449 +0,0 @@
-<!DOCTYPE html>
-<html lang="en">
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-    var host = window.location.host;
-    if (typeof host !== 'undefined' && host !== 'accumulo.apache.org') {
-      $('#non-canonical').show();
-    }
-  });
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-          
-          <h1 class="title">Security Performance Implications</h1>
-          
-          <table>
-
-<tr><td><b>Date </b></td><td> &nbsp;&nbsp;23 Feb 2017 </td></tr>
-
-</table>
-<p>
-
-
-<p>The purpose of this two part series was to measure the performance impact of
-various security configurations on a cluster running Apache Accumulo’s
-continuous ingest suite. The tests were performed using Amazon Web
-Services (AWS), Hortonworks Data Platform 2.4 and Accumulo 1.7. Each of
-the five different security settings in Accumulo 1.7 was tested including 
-no security, SSL, and SASL with Kerberos authentication for the three quality 
-of protection levels (auth, auth-int, auth-conf).  KDC was MIT.  HDFS was 
-configured to use Kerberos for authentication and had service level 
-authorization on. Other than that, no other security settings (HTTPS, RPC 
-protection, data transfer encryption, etc) were enabled.  Timely was a 
-separate, single node HDFS/Zookeeper/Accumulo instance.</p>
-
-<h2 id="intro">Intro</h2>
-
-<p>All runs utilized the continuous ingest suite that ships with Accumulo (a
-standard method to measure performance in Accumulo).  It generates random 
-graph data and inserts it into Accumulo, creating
-a long linked list of entries.  Part 1 was run with just continuous ingest.<br />
-Based on the test results, there was a measurable performance impact as each additional security configuration was put in place.</p>
-
-<h2 id="methodology">Methodology</h2>
-
-<p>We ran 5 tests, one for each security configuration.  Each iteration of each test inserted 2 billion entries.  Batch writers were configured with 500K max mem 
-to artificially inflate the overall write overhead. This was performed on a
-small cluster on AWS.</p>
-
-<p>Each test used one of the following security configurations:</p>
-
-<ul>
-  <li>No security - Default</li>
-  <li>Two way SSL</li>
-  <li>Kerberos/SASL with auth
-    <ul>
-      <li>auth is just Kerberos authentication between client and server.  Each end of the RPC definitively knows who the other is.</li>
-    </ul>
-  </li>
-  <li>Kerberos/SASL with auth-int
-    <ul>
-      <li>Builds on auth, also providing message integrity checks of the data going across the wire. You also know that the message you received was not altered.</li>
-    </ul>
-  </li>
-  <li>Kerberos/SASL with auth-conf
-    <ul>
-      <li>Builds on auth-int, also providing confidentiality of the message that was sent to prevent others from reading it (aka wire-encryption).</li>
-    </ul>
-  </li>
-</ul>
-
-<p>For each test, five iterations were run to obtain a min, max, and median
-time elapsed at each security configuration. After each iteration,
-Hadoop, and Zookeeper processes were restarted, Accumulo tables are
-wiped clean and tables are recreated. In addition, pagecache, dentries
-and inodes are dropped by issuing a ‘3’ command on
-/proc/sys/vm/drop_caches to ensure that the OS is not caching things to disk
-that might affect the benchmark. The following sequence was performed 
-between iterations:</p>
-
-<ol>
-  <li>Bring down Accumulo</li>
-  <li>Bring down Zookeeper</li>
-  <li>Bring down Hadoop</li>
-  <li>Run sync command</li>
-  <li>Drop OS cache</li>
-  <li>Bring up Hadoop</li>
-  <li>Bring up Zookeeper</li>
-  <li>Bring up Accumulo</li>
-  <li>Drop tables</li>
-  <li>Create tables</li>
-</ol>
-
-<p>For each iteration, the results were stored, fed into <a href="https://nationalsecurityagency.github.io/timely/">Timely</a>, and viewed with Grafana.
-Since the runs were executed sequentially, the start epochs for each run did not align.
-To mitigate, the entries for each run were inserted 
-with the same relative epoch for convenient comparison in Grafana.</p>
-
-<p>The table configurations for Accumulo remain the same throughout the
-different iterations and security levels. The Accumulo site
-configurations differ only due to the different settings for the
-security level configurations.</p>
-
-<h2 id="environment">Environment</h2>
-
-<p>In order to perform the testing, a small AWS cluster was setup using 14
-hosts on EC2. Two i2.xlarge instances were used as master nodes and eight
-d2.xlarge instances were used for workers. In addition, two c4.4xlarge
-instances were used for ingesters, one m4.2xlarge instance was used for
-Timely, and one m4.xlarge instance was used for Apache Ambari. A logical
-diagram of the setup is depicted below:</p>
-
-<p><img src="/images/blog/201702_security/figure1.png" alt="" width="400px" /></p>
-
-<p>Figure 1 - Cluster Layout, Roles, and Instance Types on AWS.</p>
-
-<p>The types of nodes and their function are given below:</p>
-
-<table id="instance_types" class="table">
-  <thead>
-    <tr>
-      <th style="text-align: left">Node Type</th>
-      <th style="text-align: left">AWS EC2 Type</th>
-      <th style="text-align: left">EC2 Type Details</th>
-      <th style="text-align: left">Quantity</th>
-    </tr>
-  </thead>
-  <tbody>
-    <tr>
-      <td style="text-align: left">Ingest Nodes</td>
-      <td style="text-align: left">c4.4xlarge</td>
-      <td style="text-align: left">16 core, 30 GB RAM</td>
-      <td style="text-align: left">2</td>
-    </tr>
-    <tr>
-      <td style="text-align: left">Worker Node</td>
-      <td style="text-align: left">d2.xlarge</td>
-      <td style="text-align: left">4 cores, 30.5 GB RAM, 3x2T GB HD</td>
-      <td style="text-align: left">8</td>
-    </tr>
-    <tr>
-      <td style="text-align: left">Master Node</td>
-      <td style="text-align: left">i2.xlarge</td>
-      <td style="text-align: left">4 cores, 30.5 GB RAM, 1x800GB SSD</td>
-      <td style="text-align: left">2</td>
-    </tr>
-    <tr>
-      <td style="text-align: left">Admin Node</td>
-      <td style="text-align: left">m4.xlarge</td>
-      <td style="text-align: left">4 cores, 16 GB RAM</td>
-      <td style="text-align: left">1</td>
-    </tr>
-    <tr>
-      <td style="text-align: left">Timely Node</td>
-      <td style="text-align: left">m4.2xlarge</td>
-      <td style="text-align: left">8 cores, 32 GB RAM</td>
-      <td style="text-align: left">1</td>
-    </tr>
-  </tbody>
-</table>
-
-<p>Table 1 – AWS Instance Types, Role, Details, and Quantities</p>
-
-<h2 id="results">Results</h2>
-
-<p>The median, max, and min of the milliseconds elapsed
-time of all iterations for each test is displayed below. The percentage change
-columns compare the Median, Max, and Min respectively from the no
-security level to each security configuration (e.g. no security Median
-vs. auth-int Median, no security Max vs. auth-int Max).</p>
-
-<table id="results" class="table">
-  <thead>
-    <tr>
-      <th>Security Level</th>
-      <th style="text-align: right">Median</th>
-      <th style="text-align: right">Standard Deviation</th>
-      <th style="text-align: right">Max</th>
-      <th style="text-align: right">Min</th>
-      <th style="text-align: right">% Change (nosec Median vs. Median)</th>
-      <th style="text-align: right">% Change (nosec Max vs. Max)</th>
-      <th style="text-align: right">% Change (nosec Min vs. Min)</th>
-      <th style="text-align: right">Delta from Previous Level (Median)</th>
-    </tr>
-  </thead>
-  <tbody>
-    <tr>
-      <td>no security</td>
-      <td style="text-align: right">7829394</td>
-      <td style="text-align: right">139340</td>
-      <td style="text-align: right">8143035</td>
-      <td style="text-align: right">7764309</td>
-      <td style="text-align: right">0.00%</td>
-      <td style="text-align: right">0.00%</td>
-      <td style="text-align: right">0.00%</td>
-      <td style="text-align: right">0.00%</td>
-    </tr>
-    <tr>
-      <td>ssl</td>
-      <td style="text-align: right">8292760</td>
-      <td style="text-align: right">87012</td>
-      <td style="text-align: right">8464060</td>
-      <td style="text-align: right">8204955</td>
-      <td style="text-align: right">5.92%</td>
-      <td style="text-align: right">3.94%</td>
-      <td style="text-align: right">5.68%</td>
-      <td style="text-align: right">5.92%</td>
-    </tr>
-    <tr>
-      <td>auth</td>
-      <td style="text-align: right">8859552</td>
-      <td style="text-align: right">134109</td>
-      <td style="text-align: right">9047971</td>
-      <td style="text-align: right">8657618</td>
-      <td style="text-align: right">13.16%</td>
-      <td style="text-align: right">11.11%</td>
-      <td style="text-align: right">11.51%</td>
-      <td style="text-align: right">6.83%</td>
-    </tr>
-    <tr>
-      <td>auth-int</td>
-      <td style="text-align: right">9500737</td>
-      <td style="text-align: right">155968</td>
-      <td style="text-align: right">9753424</td>
-      <td style="text-align: right">9282371</td>
-      <td style="text-align: right">21.34%</td>
-      <td style="text-align: right">19.78%</td>
-      <td style="text-align: right">19.55%</td>
-      <td style="text-align: right">7.24%</td>
-    </tr>
-    <tr>
-      <td>auth-conf</td>
-      <td style="text-align: right">9479635</td>
-      <td style="text-align: right">170823</td>
-      <td style="text-align: right">9776580</td>
-      <td style="text-align: right">9282189</td>
-      <td style="text-align: right">21.08%</td>
-      <td style="text-align: right">20.06%</td>
-      <td style="text-align: right">19.55%</td>
-      <td style="text-align: right">-0.22%</td>
-    </tr>
-  </tbody>
-</table>
-
-<p>Table 2 – Summarized Time Elapsed for Each Security Level</p>
-
-<h2 id="plots">Plots</h2>
-
-<p>Below are some snapshots of *stats.out elements via Grafana that were inserted
-into Timely with the same relative start time.  Each graph represents a field 
-in the output generated by <a href="https://github.com/apache/accumulo/blob/1.7/test/src/main/java/org/apache/accumulo/test/continuous/ContinuousStatsCollector.java">ContinuousStatsCollector</a></p>
-
-<h3 id="tablerecshttpsgithubcomapacheaccumuloblob17coresrcmainjavaorgapacheaccumulocoremasterthrifttableinfojaval73"><a href="https://github.com/apache/accumulo/blob/1.7/core/src/main/java/org/apache/accumulo/core/master/thrift/TableInfo.java#L73">TABLE_RECS</a></h3>
-<p>(Number of records in the continuous ingest table.  Down sample=1m, aggregate=avg)</p>
-
-<p><a href="/images/blog/201702_security/tableRecs.png"><img src="/images/blog/201702_security/tableRecs.png" alt="" width="800px" /></a></p>
-
-<h3 id="totalingesthttpsgithubcomapacheaccumuloblob17coresrcmainjavaorgapacheaccumulocoremasterthrifttableinfojaval77"><a href="https://github.com/apache/accumulo/blob/1.7/core/src/main/java/org/apache/accumulo/core/master/thrift/TableInfo.java#L77">TOTAL_INGEST</a></h3>
-<p>(Ingest rate for Accumulo instance.  Down sample=5m, aggregate=avg)</p>
-
-<p><a href="/images/blog/201702_security/totalIngest.png"><img src="/images/blog/201702_security/totalIngest.png" alt="" width="800px" /></a></p>
-
-<h3 id="avgfilestablethttpsgithubcomapacheaccumuloblob17coresrcmainjavaorgapacheaccumulocoreutilstatjaval63"><a href="https://github.com/apache/accumulo/blob/1.7/core/src/main/java/org/apache/accumulo/core/util/Stat.java#L63">AVG_FILES/TABLET</a></h3>
-<p>(Average number of files per Accumulo tablet.  Down sample=1m, aggregate=avg)</p>
-
-<p><a href="/images/blog/201702_security/avgFilesTab.png"><img src="/images/blog/201702_security/avgFilesTab.png" alt="" width="800px" /></a></p>
-
-<h3 id="accumulofileshttpsgithubcomapacheaccumuloblob17testsrcmainjavaorgapacheaccumulotestcontinuouscontinuousstatscollectorjaval127"><a href="https://github.com/apache/accumulo/blob/1.7/test/src/main/java/org/apache/accumulo/test/continuous/ContinuousStatsCollector.java#L127">ACCUMULO_FILES</a></h3>
-<p>(Total number of files for Accumulo.  Down sample=1m, aggregate=avg)</p>
-
-<p><a href="/images/blog/201702_security/accumuloFiles.png"><img src="/images/blog/201702_security/accumuloFiles.png" alt="" width="800px" /></a></p>
-
-<p>As can be seen in the plots above, the different security settings have 
-relatively consistent, discernable median run characteristics.  The big
-dip in each TOTAL_INGEST coincides with a large number of major
-compactions, a rate decrease for TABLE_RECS, and a decrease in 
-AVG_FILES/TABLET.</p>
-
-<h2 id="final-thoughts">Final Thoughts</h2>
-
-<p>The biggest performance 
-hits to run duration median (compared to default security) were ~21% for 
-auth-int and auth-conf.  Interesting to note that SSL’s median run duration was 
-lower than all SASL configs and that auth-conf’s was lower than auth-int. 
-Initial  speculation for these oddities revolved around the 
-<a href="https://github.com/m1ch1/mapkeeper/wiki/Thrift-Java-Servers-Compared">Thrift server</a> 
-implementations, but the Thrift differences will not explain the auth-conf/int 
-disparity since both utilize TThreadPoolServer.  It was certainly unexpected that the 
-addition of wire encryption would yield a faster median run duration.  This result 
-prompted, as a sanity check, sniffing the net traffic (in a contrived example 
-not during a timed run) in both auth-conf and auth-int to ensure that the message 
-contents were actually obfuscated in auth-conf (they were) and not obfuscated in 
-auth-int (they weren’t).</p>
-
-<h2 id="future-work">Future Work</h2>
-
-<p>Part 2 of this series will consist of the same continuous ingest loads and 
-configurations with the addition of a query load on the system.</p>
-
-
-
-<p><strong>View all posts in the <a href="/news">news archive</a></strong></p>
-
-        </div>
-
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-<footer>
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+          
+          <h1 class="title">Security Performance Implications</h1>
+          
+          <table>
+
+<tr><td><b>Date </b></td><td> &nbsp;&nbsp;06 Mar 2017 </td></tr>
+
+</table>
+<p>
+
+
+<p>The purpose of this two part series was to measure the performance impact of
+various security configurations on a cluster running Apache Accumulo’s
+continuous ingest suite. The tests were performed using Amazon Web
+Services (AWS), Hortonworks Data Platform 2.4 and Accumulo 1.7. Each of
+the five different security settings in Accumulo 1.7 was tested including 
+no security, SSL, and SASL with Kerberos authentication for the three quality 
+of protection levels (auth, auth-int, auth-conf).  KDC was MIT.  HDFS was 
+configured to use Kerberos for authentication and had service level 
+authorization on. Other than that, no other security settings (HTTPS, RPC 
+protection, data transfer encryption, etc) were enabled.  Timely was a 
+separate, single node HDFS/Zookeeper/Accumulo instance.</p>
+
+<h2 id="intro">Intro</h2>
+
+<p>All runs utilized the continuous ingest suite that ships with Accumulo (a
+standard method to measure performance in Accumulo).  It generates random 
+graph data and inserts it into Accumulo, creating
+a long linked list of entries.  Part 1 was run with just continuous ingest.<br />
+Based on the test results, there was a measurable performance impact as each additional security configuration was put in place.</p>
+
+<h2 id="methodology">Methodology</h2>
+
+<p>We ran 5 tests, one for each security configuration.  Each iteration of each test inserted 2 billion entries.  Batch writers were configured with 500K max mem 
+to artificially inflate the overall write overhead. This was performed on a
+small cluster on AWS.</p>
+
+<p>Each test used one of the following security configurations:</p>
+
+<ul>
+  <li>No security - Default</li>
+  <li>Two way SSL</li>
+  <li>Kerberos/SASL with auth
+    <ul>
+      <li>auth is just Kerberos authentication between client and server.  Each end of the RPC definitively knows who the other is.</li>
+    </ul>
+  </li>
+  <li>Kerberos/SASL with auth-int
+    <ul>
+      <li>Builds on auth, also providing message integrity checks of the data going across the wire. You also know that the message you received was not altered.</li>
+    </ul>
+  </li>
+  <li>Kerberos/SASL with auth-conf
+    <ul>
+      <li>Builds on auth-int, also providing confidentiality of the message that was sent to prevent others from reading it (aka wire-encryption).</li>
+    </ul>
+  </li>
+</ul>
+
+<p>For each test, five iterations were run to obtain a min, max, and median
+time elapsed at each security configuration. After each iteration,
+Hadoop, and Zookeeper processes were restarted, Accumulo tables are
+wiped clean and tables are recreated. In addition, pagecache, dentries
+and inodes are dropped by issuing a ‘3’ command on
+/proc/sys/vm/drop_caches to ensure that the OS is not caching things to disk
+that might affect the benchmark. The following sequence was performed 
+between iterations:</p>
+
+<ol>
+  <li>Bring down Accumulo</li>
+  <li>Bring down Zookeeper</li>
+  <li>Bring down Hadoop</li>
+  <li>Run sync command</li>
+  <li>Drop OS cache</li>
+  <li>Bring up Hadoop</li>
+  <li>Bring up Zookeeper</li>
+  <li>Bring up Accumulo</li>
+  <li>Drop tables</li>
+  <li>Create tables</li>
+</ol>
+
+<p>For each iteration, the results were stored, fed into <a href="https://nationalsecurityagency.github.io/timely/">Timely</a>, and viewed with Grafana.
+Since the runs were executed sequentially, the start epochs for each run did not align.
+To mitigate, the entries for each run were inserted 
+with the same relative epoch for convenient comparison in Grafana.</p>
+
+<p>The table configurations for Accumulo remain the same throughout the
+different iterations and security levels. The Accumulo site
+configurations differ only due to the different settings for the
+security level configurations.</p>
+
+<h2 id="environment">Environment</h2>
+
+<p>In order to perform the testing, a small AWS cluster was setup using 14
+hosts on EC2. Two i2.xlarge instances were used as master nodes and eight
+d2.xlarge instances were used for workers. In addition, two c4.4xlarge
+instances were used for ingesters, one m4.2xlarge instance was used for
+Timely, and one m4.xlarge instance was used for Apache Ambari. A logical
+diagram of the setup is depicted below:</p>
+
+<p><img src="/images/blog/201702_security/figure1.png" alt="" width="400px" /></p>
+
+<p>Figure 1 - Cluster Layout, Roles, and Instance Types on AWS.</p>
+
+<p>The types of nodes and their function are given below:</p>
+
+<table id="instance_types" class="table">
+  <thead>
+    <tr>
+      <th style="text-align: left">Node Type</th>
+      <th style="text-align: left">AWS EC2 Type</th>
+      <th style="text-align: left">EC2 Type Details</th>
+      <th style="text-align: left">Quantity</th>
+    </tr>
+  </thead>
+  <tbody>
+    <tr>
+      <td style="text-align: left">Ingest Nodes</td>
+      <td style="text-align: left">c4.4xlarge</td>
+      <td style="text-align: left">16 core, 30 GB RAM</td>
+      <td style="text-align: left">2</td>
+    </tr>
+    <tr>
+      <td style="text-align: left">Worker Node</td>
+      <td style="text-align: left">d2.xlarge</td>
+      <td style="text-align: left">4 cores, 30.5 GB RAM, 3x2T GB HD</td>
+      <td style="text-align: left">8</td>
+    </tr>
+    <tr>
+      <td style="text-align: left">Master Node</td>
+      <td style="text-align: left">i2.xlarge</td>
+      <td style="text-align: left">4 cores, 30.5 GB RAM, 1x800GB SSD</td>
+      <td style="text-align: left">2</td>
+    </tr>
+    <tr>
+      <td style="text-align: left">Admin Node</td>
+      <td style="text-align: left">m4.xlarge</td>
+      <td style="text-align: left">4 cores, 16 GB RAM</td>
+      <td style="text-align: left">1</td>
+    </tr>
+    <tr>
+      <td style="text-align: left">Timely Node</td>
+      <td style="text-align: left">m4.2xlarge</td>
+      <td style="text-align: left">8 cores, 32 GB RAM</td>
+      <td style="text-align: left">1</td>
+    </tr>
+  </tbody>
+</table>
+
+<p>Table 1 – AWS Instance Types, Role, Details, and Quantities</p>
+
+<h2 id="results">Results</h2>
+
+<p>The median, max, and min of the milliseconds elapsed
+time of all iterations for each test is displayed below. The percentage change
+columns compare the Median, Max, and Min respectively from the no
+security level to each security configuration (e.g. no security Median
+vs. auth-int Median, no security Max vs. auth-int Max).</p>
+
+<table id="results" class="table">
+  <thead>
+    <tr>
+      <th>Security Level</th>
+      <th style="text-align: right">Median</th>
+      <th style="text-align: right">Standard Deviation</th>
+      <th style="text-align: right">Max</th>
+      <th style="text-align: right">Min</th>
+      <th style="text-align: right">% Change (nosec Median vs. Median)</th>
+      <th style="text-align: right">% Change (nosec Max vs. Max)</th>
+      <th style="text-align: right">% Change (nosec Min vs. Min)</th>
+      <th style="text-align: right">Delta from Previous Level (Median)</th>
+    </tr>
+  </thead>
+  <tbody>
+    <tr>
+      <td>no security</td>
+      <td style="text-align: right">7829394</td>
+      <td style="text-align: right">139340</td>
+      <td style="text-align: right">8143035</td>
+      <td style="text-align: right">7764309</td>
+      <td style="text-align: right">0.00%</td>
+      <td style="text-align: right">0.00%</td>
+      <td style="text-align: right">0.00%</td>
+      <td style="text-align: right">0.00%</td>
+    </tr>
+    <tr>
+      <td>ssl</td>
+      <td style="text-align: right">8292760</td>
+      <td style="text-align: right">87012</td>
+      <td style="text-align: right">8464060</td>
+      <td style="text-align: right">8204955</td>
+      <td style="text-align: right">5.92%</td>
+      <td style="text-align: right">3.94%</td>
+      <td style="text-align: right">5.68%</td>
+      <td style="text-align: right">5.92%</td>
+    </tr>
+    <tr>
+      <td>auth</td>
+      <td style="text-align: right">8859552</td>
+      <td style="text-align: right">134109</td>
+      <td style="text-align: right">9047971</td>
+      <td style="text-align: right">8657618</td>
+      <td style="text-align: right">13.16%</td>
+      <td style="text-align: right">11.11%</td>
+      <td style="text-align: right">11.51%</td>
+      <td style="text-align: right">6.83%</td>
+    </tr>
+    <tr>
+      <td>auth-int</td>
+      <td style="text-align: right">9500737</td>
+      <td style="text-align: right">155968</td>
+      <td style="text-align: right">9753424</td>
+      <td style="text-align: right">9282371</td>
+      <td style="text-align: right">21.34%</td>
+      <td style="text-align: right">19.78%</td>
+      <td style="text-align: right">19.55%</td>
+      <td style="text-align: right">7.24%</td>
+    </tr>
+    <tr>
+      <td>auth-conf</td>
+      <td style="text-align: right">9479635</td>
+      <td style="text-align: right">170823</td>
+      <td style="text-align: right">9776580</td>
+      <td style="text-align: right">9282189</td>
+      <td style="text-align: right">21.08%</td>
+      <td style="text-align: right">20.06%</td>
+      <td style="text-align: right">19.55%</td>
+      <td style="text-align: right">-0.22%</td>
+    </tr>
+  </tbody>
+</table>
+
+<p>Table 2 – Summarized Time Elapsed for Each Security Level</p>
+
+<h2 id="plots">Plots</h2>
+
+<p>Below are some snapshots of *stats.out elements via Grafana that were inserted
+into Timely with the same relative start time.  Each graph represents a field 
+in the output generated by <a href="https://github.com/apache/accumulo/blob/1.7/test/src/main/java/org/apache/accumulo/test/continuous/ContinuousStatsCollector.java">ContinuousStatsCollector</a></p>
+
+<h3 id="tablerecshttpsgithubcomapacheaccumuloblob17coresrcmainjavaorgapacheaccumulocoremasterthrifttableinfojaval73"><a href="https://github.com/apache/accumulo/blob/1.7/core/src/main/java/org/apache/accumulo/core/master/thrift/TableInfo.java#L73">TABLE_RECS</a></h3>
+<p>(Number of records in the continuous ingest table.  Down sample=1m, aggregate=avg)</p>
+
+<p><a href="/images/blog/201702_security/tableRecs.png"><img src="/images/blog/201702_security/tableRecs.png" alt="" width="800px" /></a></p>
+
+<h3 id="totalingesthttpsgithubcomapacheaccumuloblob17coresrcmainjavaorgapacheaccumulocoremasterthrifttableinfojaval77"><a href="https://github.com/apache/accumulo/blob/1.7/core/src/main/java/org/apache/accumulo/core/master/thrift/TableInfo.java#L77">TOTAL_INGEST</a></h3>
+<p>(Ingest rate for Accumulo instance.  Down sample=5m, aggregate=avg)</p>
+
+<p><a href="/images/blog/201702_security/totalIngest.png"><img src="/images/blog/201702_security/totalIngest.png" alt="" width="800px" /></a></p>
+
+<h3 id="avgfilestablethttpsgithubcomapacheaccumuloblob17coresrcmainjavaorgapacheaccumulocoreutilstatjaval63"><a href="https://github.com/apache/accumulo/blob/1.7/core/src/main/java/org/apache/accumulo/core/util/Stat.java#L63">AVG_FILES/TABLET</a></h3>
+<p>(Average number of files per Accumulo tablet.  Down sample=1m, aggregate=avg)</p>
+
+<p><a href="/images/blog/201702_security/avgFilesTab.png"><img src="/images/blog/201702_security/avgFilesTab.png" alt="" width="800px" /></a></p>
+
+<h3 id="accumulofileshttpsgithubcomapacheaccumuloblob17testsrcmainjavaorgapacheaccumulotestcontinuouscontinuousstatscollectorjaval127"><a href="https://github.com/apache/accumulo/blob/1.7/test/src/main/java/org/apache/accumulo/test/continuous/ContinuousStatsCollector.java#L127">ACCUMULO_FILES</a></h3>
+<p>(Total number of files for Accumulo.  Down sample=1m, aggregate=avg)</p>
+
+<p><a href="/images/blog/201702_security/accumuloFiles.png"><img src="/images/blog/201702_security/accumuloFiles.png" alt="" width="800px" /></a></p>
+
+<p>As can be seen in the plots above, the different security settings have 
+relatively consistent, discernable median run characteristics.  The big
+dip in each TOTAL_INGEST coincides with a large number of major
+compactions, a rate decrease for TABLE_RECS, and a decrease in 
+AVG_FILES/TABLET.</p>
+
+<h2 id="final-thoughts">Final Thoughts</h2>
+
+<p>The biggest performance 
+hits to run duration median (compared to default security) were ~21% for 
+auth-int and auth-conf.  Interesting to note that SSL’s median run duration was 
+lower than all SASL configs and that auth-conf’s was lower than auth-int. 
+Initial  speculation for these oddities revolved around the 
+<a href="https://github.com/m1ch1/mapkeeper/wiki/Thrift-Java-Servers-Compared">Thrift server</a> 
+implementations, but the Thrift differences will not explain the auth-conf/int 
+disparity since both utilize TThreadPoolServer.  It was certainly unexpected that the 
+addition of wire encryption would yield a faster median run duration.  This result 
+prompted, as a sanity check, sniffing the net traffic (in a contrived example 
+not during a timed run) in both auth-conf and auth-int to ensure that the message 
+contents were actually obfuscated in auth-conf (they were) and not obfuscated in 
+auth-int (they weren’t).</p>
+
+<h2 id="future-work">Future Work</h2>
+
+<p>Part 2 of this series will consist of the same continuous ingest loads and 
+configurations with the addition of a query load on the system.</p>
+
+
+
+<p><strong>View all posts in the <a href="/news">news archive</a></strong></p>
+
+        </div>
+
+        
+<footer>
+
+  <p><a href="https://www.apache.org"><img src="/images/feather-small.gif" alt="Apache Software Foundation" id="asf-logo" height="100" /></a></p>
+
+  <p>Copyright © 2011-2017 The Apache Software Foundation. Licensed under the <a href="https://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
+
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+
+
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http://git-wip-us.apache.org/repos/asf/accumulo-website/blob/ccd797a9/feed.xml
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 </description>
     <link>https://accumulo.apache.org/</link>
     <atom:link href="https://accumulo.apache.org/feed.xml" rel="self" type="application/rss+xml"/>
-    <pubDate>Mon, 06 Mar 2017 17:58:36 -0500</pubDate>
-    <lastBuildDate>Mon, 06 Mar 2017 17:58:36 -0500</lastBuildDate>
+    <pubDate>Mon, 06 Mar 2017 18:02:12 -0500</pubDate>
+    <lastBuildDate>Mon, 06 Mar 2017 18:02:12 -0500</lastBuildDate>
     <generator>Jekyll v3.3.1</generator>
     
       <item>
-        <title>Apache Accumulo 1.8.1</title>
-        <description>&lt;p&gt;Apache Accumulo 1.8. is a maintenance release on the 1.8 version branch. This
-release contains changes from more then 40 issues, comprised of bug-fixes,
-performance improvements, build quality improvements, and more. See
-&lt;a href=&quot;https://issues.apache.org/jira/secure/ReleaseNote.jspa?projectId=12312121&amp;amp;version=12335830&quot;&gt;JIRA&lt;/a&gt; for a complete list.&lt;/p&gt;
-
-&lt;p&gt;Below are resources for this release:&lt;/p&gt;
-
-&lt;ul&gt;
-  &lt;li&gt;&lt;a href=&quot;/1.8/accumulo_user_manual.html&quot;&gt;User Manual&lt;/a&gt;&lt;/li&gt;
-  &lt;li&gt;&lt;a href=&quot;/1.8/apidocs&quot;&gt;Javadocs&lt;/a&gt;&lt;/li&gt;
-  &lt;li&gt;&lt;a href=&quot;/1.8/examples&quot;&gt;Examples&lt;/a&gt;&lt;/li&gt;
-&lt;/ul&gt;
-
-&lt;p&gt;In the context of Accumulo’s &lt;a href=&quot;http://semver.org&quot;&gt;Semantic Versioning&lt;/a&gt; &lt;a href=&quot;https://github.com/apache/accumulo/blob/1.8/README.md#api&quot;&gt;guidelines&lt;/a&gt;,
-this is a “minor version”. This means that new APIs have been created, some
-deprecations may have been added, but no deprecated APIs have been removed.
-Code written against 1.7.x should work against 1.8.0 – binary compatibility
-has been preserved with one exception of an already-deprecated Mock Accumulo
-utility class. As always, the Accumulo developers take API compatibility
-very seriously and have invested much time to ensure that we meet the promises set forth to our users.&lt;/p&gt;
-
-&lt;h2 id=&quot;major-changes&quot;&gt;Major Changes&lt;/h2&gt;
-
-&lt;h3 id=&quot;problem-with-scans-right-after-minor-compaction&quot;&gt;Problem with scans right after minor compaction&lt;/h3&gt;
-
-&lt;p&gt;A bug was found when 2 or more concurrent scans run on a tablet that
-has just undergone minor compaction. The minor compaction thread
-writes the in-memory map to a local temporary rfile and tries to
-switch the current iterators to use it instead of the native map. The
-iterator code in the scan thread may also switch itself to use the local
-temporary rfile it if notices it before the minor compaction threads
-performs the switch. The bug happened shortly after the switch when
-one of the iterator threads will get a NegativeArraySizeException.
-See &lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4483&quot;&gt;ACCUMULO-4483&lt;/a&gt; for more info.&lt;/p&gt;
-
-&lt;h3 id=&quot;tablet-server-performance-improvement&quot;&gt;Tablet Server Performance Improvement&lt;/h3&gt;
-
-&lt;p&gt;&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4458&quot;&gt;ACCUMULO-4458&lt;/a&gt; mitigated some contention on the Hadoop 
-configuration instance backing the XML configs read for SiteConfiguration.&lt;br /&gt;
-This should improve overall Tablet Server performance.&lt;/p&gt;
-
-&lt;h3 id=&quot;synchronization-issue-with-deep-copies-of-sources&quot;&gt;Synchronization issue with deep copies of sources&lt;/h3&gt;
-
-&lt;p&gt;Deep copies of iterator sources were not thread safe and threw
-exceptions, mostly down in the ZlibDecompressor library.  The real bug
-was in the BoundedRangeFileInputStream.  The read() method
-synchronizes on the underlying FSDataInputStream, however the
-available() method did not.   See &lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4391&quot;&gt;ACCUMULO-4391&lt;/a&gt;.&lt;/p&gt;
-
-&lt;h3 id=&quot;system-permission-bug-in-thrift-proxy&quot;&gt;System permission bug in Thrift Proxy&lt;/h3&gt;
-
-&lt;p&gt;The Accumulo Proxy lacked support for the following system permissions:&lt;/p&gt;
-
-&lt;ul&gt;
-  &lt;li&gt;System.CREATE_NAMESPACE&lt;/li&gt;
-  &lt;li&gt;System.DROP_NAMESPACE&lt;/li&gt;
-  &lt;li&gt;System.ALTER_NAMESPACE&lt;/li&gt;
-  &lt;li&gt;System.OBTAIN_DELEGATION_TOKEN&lt;/li&gt;
-&lt;/ul&gt;
-
-&lt;p&gt;Ticket is &lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4519&quot;&gt;ACCUMULO-4519&lt;/a&gt;.&lt;/p&gt;
-
-&lt;h3 id=&quot;shell-compaction-file-selection-options-can-block&quot;&gt;Shell compaction file selection options can block&lt;/h3&gt;
-
-&lt;p&gt;The block happens when the tablet lock is held.  The tablet lock is
-meant to protect changes to the tablets internal metadata, and
-blocking operations should not occur while this lock is held.  The
-compaction command has options to select files based on some
-criteria, some of which required blocking operations.  This issue is
-fixed in &lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4572&quot;&gt;ACCUMULO-4572&lt;/a&gt;.&lt;/p&gt;
-
-&lt;h3 id=&quot;hostregextableloadbalancer-used-stale-information&quot;&gt;HostRegexTableLoadBalancer used stale information&lt;/h3&gt;
-
-&lt;p&gt;The HostRegexTableLoadBalander maintains an internal mapping of tablet
-server pools and tablet server status. It was updated at a
-configurable interval initially as an optimization. Unfortunately it
-had the negative side effect of providing the assignment and balance
-operations with stale information.  This lead to a constant shuffling
-of tablets.  The configuration property was removed so that
-assign/balance methods get updated information every time.  See
-&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4576&quot;&gt;ACCUMULO-4576&lt;/a&gt;.&lt;/p&gt;
-
-&lt;h3 id=&quot;modify-tableoperations-online-to-check-for-table-state&quot;&gt;Modify TableOperations online to check for table state&lt;/h3&gt;
-
-&lt;p&gt;The table operations online operation executes as a fate
-operation. If a transaction lock for the table is currently held,
-this operation will block even if no action is needed. 
-&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4574&quot;&gt;ACCUMULO-4574&lt;/a&gt; changes the behavior of the online
-operation to a NOOP if the table is already in the requested state.
-This returns immediately without queuing a fate operation.&lt;/p&gt;
-
-&lt;h2 id=&quot;other-notable-changes&quot;&gt;Other Notable Changes&lt;/h2&gt;
-
-&lt;ul&gt;
-  &lt;li&gt;&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4488&quot;&gt;ACCUMULO-4488&lt;/a&gt; Fix gap in user manual on Kerberos for clients&lt;/li&gt;
-  &lt;li&gt;&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-2724&quot;&gt;ACCUMULO-2724&lt;/a&gt; CollectTabletStats had multiple -t parameter&lt;/li&gt;
-  &lt;li&gt;&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4431&quot;&gt;ACCUMULO-4431&lt;/a&gt; Log what random is chosen for a tserver.&lt;/li&gt;
-  &lt;li&gt;&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4494&quot;&gt;ACCUMULO-4494&lt;/a&gt; Include column family seeks in the Iterator Test Harness&lt;/li&gt;
-  &lt;li&gt;&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4549&quot;&gt;ACCUMULO-4549&lt;/a&gt; Remove duplicate init functions in TabletBalancer&lt;/li&gt;
-  &lt;li&gt;&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4467&quot;&gt;ACCUMULO-4467&lt;/a&gt; Random Walk broken because of unmet dependency on commons-math&lt;/li&gt;
-  &lt;li&gt;&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4578&quot;&gt;ACCUMULO-4578&lt;/a&gt; Cancel compaction FATE operation does not release namespace lock&lt;/li&gt;
-  &lt;li&gt;&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4505&quot;&gt;ACCUMULO-4505&lt;/a&gt; Shell still reads accumulo-site.xml when using Zookeeper CLI options&lt;/li&gt;
-  &lt;li&gt;&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4535&quot;&gt;ACCUMULO-4535&lt;/a&gt; HostRegexTableLoadBalancer fails with NullPointerException&lt;/li&gt;
-  &lt;li&gt;&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4575&quot;&gt;ACCUMULO-4575&lt;/a&gt; Concurrent table delete operations leave orphan fate transaction locks&lt;/li&gt;
-&lt;/ul&gt;
-
-&lt;h2 id=&quot;upgrading&quot;&gt;Upgrading&lt;/h2&gt;
-
-&lt;p&gt;Upgrades from 1.7 to 1.8 are possible with little effort as no changes were made at the data layer and RPC changes
-were made in a backwards-compatible way. The recommended way is to stop Accumulo 1.7, perform the Accumulo upgrade to
-1.8, and then start 1.8. Like previous versions, after 1.8 is started on a 1.7 instance, a one-time upgrade will
-happen by the Master which will prevent a downgrade back to 1.7. Upgrades are still one way. Upgrades from versions
-prior to 1.7 to 1.8 should follow the below path to 1.7 and then perform the upgrade to 1.8 – direct upgrades to 1.8
-for versions other than 1.7 are untested.&lt;/p&gt;
-
-&lt;p&gt;Existing configuration files from 1.7 should be compared against the examples provided in 1.8. The 1.7 configuration
-files should all function with 1.8 code, but you will likely want to include changes found in the 
-&lt;a href=&quot;/release/accumulo-1.8.0/&quot;&gt;1.8.0 release notes&lt;/a&gt; and these release notes for 1.8.1.&lt;/p&gt;
-
-&lt;p&gt;For upgrades from prior to 1.7, follow the upgrade instructions to 1.7 first.&lt;/p&gt;
-
-&lt;h2 id=&quot;testing&quot;&gt;Testing&lt;/h2&gt;
-
-&lt;p&gt;Each unit and functional test only runs on a single node, while the RandomWalk
-and Continuous Ingest tests run on any number of nodes. &lt;em&gt;Agitation&lt;/em&gt; refers to
-randomly restarting Accumulo processes and Hadoop Datanode processes, and, in
-HDFS High-Availability instances, forcing NameNode failover.&lt;/p&gt;
-
-&lt;table id=&quot;release_notes_testing&quot; class=&quot;table&quot;&gt;
-  &lt;thead&gt;
-    &lt;tr&gt;
-      &lt;th&gt;OS/Environment&lt;/th&gt;
-      &lt;th&gt;Hadoop&lt;/th&gt;
-      &lt;th&gt;Nodes&lt;/th&gt;
-      &lt;th&gt;ZooKeeper&lt;/th&gt;
-      &lt;th&gt;HDFS HA&lt;/th&gt;
-      &lt;th&gt;Tests&lt;/th&gt;
-    &lt;/tr&gt;
-  &lt;/thead&gt;
-  &lt;tbody&gt;
-    &lt;tr&gt;
-      &lt;td&gt;CentOS7/openJDK1.8.0_121/EC2; 1 m3.xlarge leader, 8 d2.xlarge workers&lt;/td&gt;
-      &lt;td&gt;2.7.3&lt;/td&gt;
-      &lt;td&gt;9&lt;/td&gt;
-      &lt;td&gt;3.4.9&lt;/td&gt;
-      &lt;td&gt;No&lt;/td&gt;
-      &lt;td&gt;24 HR Continuous Ingest without Agitation.&lt;/td&gt;
-    &lt;/tr&gt;
-    &lt;tr&gt;
-      &lt;td&gt;CentOS7/openJDK1.8.0_121/EC2; 1 m3.xlarge leader, 8 d2.xlarge workers&lt;/td&gt;
-      &lt;td&gt;2.7.3&lt;/td&gt;
-      &lt;td&gt;9&lt;/td&gt;
-      &lt;td&gt;3.4.9&lt;/td&gt;
-      &lt;td&gt;No&lt;/td&gt;
-      &lt;td&gt;24 HR Continuous Ingest with Agitation.&lt;/td&gt;
-    &lt;/tr&gt;
-  &lt;/tbody&gt;
-&lt;/table&gt;
-
-</description>
-        <pubDate>Sun, 26 Feb 2017 00:00:00 -0500</pubDate>
-        <link>https://accumulo.apache.org/release/accumulo-1.8.1/</link>
-        <guid isPermaLink="true">https://accumulo.apache.org/release/accumulo-1.8.1/</guid>
-        
-        
-        <category>release</category>
-        
-      </item>
-    
-      <item>
         <title>Security Performance Implications</title>
         <description>
 &lt;p&gt;The purpose of this two part series was to measure the performance impact of
@@ -461,9 +290,9 @@ auth-int (they weren’t).&lt;/p&gt;
 configurations with the addition of a query load on the system.&lt;/p&gt;
 
 </description>
-        <pubDate>Thu, 23 Feb 2017 00:00:00 -0500</pubDate>
-        <link>https://accumulo.apache.org/blog/2017/02/23/security-performance-implications.html</link>
-        <guid isPermaLink="true">https://accumulo.apache.org/blog/2017/02/23/security-performance-implications.html</guid>
+        <pubDate>Mon, 06 Mar 2017 00:00:00 -0500</pubDate>
+        <link>https://accumulo.apache.org/blog/2017/03/06/security-performance-implications.html</link>
+        <guid isPermaLink="true">https://accumulo.apache.org/blog/2017/03/06/security-performance-implications.html</guid>
         
         
         <category>blog</category>
@@ -471,6 +300,177 @@ configurations with the addition of a query load on the system.&lt;/p&gt;
       </item>
     
       <item>
+        <title>Apache Accumulo 1.8.1</title>
+        <description>&lt;p&gt;Apache Accumulo 1.8. is a maintenance release on the 1.8 version branch. This
+release contains changes from more then 40 issues, comprised of bug-fixes,
+performance improvements, build quality improvements, and more. See
+&lt;a href=&quot;https://issues.apache.org/jira/secure/ReleaseNote.jspa?projectId=12312121&amp;amp;version=12335830&quot;&gt;JIRA&lt;/a&gt; for a complete list.&lt;/p&gt;
+
+&lt;p&gt;Below are resources for this release:&lt;/p&gt;
+
+&lt;ul&gt;
+  &lt;li&gt;&lt;a href=&quot;/1.8/accumulo_user_manual.html&quot;&gt;User Manual&lt;/a&gt;&lt;/li&gt;
+  &lt;li&gt;&lt;a href=&quot;/1.8/apidocs&quot;&gt;Javadocs&lt;/a&gt;&lt;/li&gt;
+  &lt;li&gt;&lt;a href=&quot;/1.8/examples&quot;&gt;Examples&lt;/a&gt;&lt;/li&gt;
+&lt;/ul&gt;
+
+&lt;p&gt;In the context of Accumulo’s &lt;a href=&quot;http://semver.org&quot;&gt;Semantic Versioning&lt;/a&gt; &lt;a href=&quot;https://github.com/apache/accumulo/blob/1.8/README.md#api&quot;&gt;guidelines&lt;/a&gt;,
+this is a “minor version”. This means that new APIs have been created, some
+deprecations may have been added, but no deprecated APIs have been removed.
+Code written against 1.7.x should work against 1.8.0 – binary compatibility
+has been preserved with one exception of an already-deprecated Mock Accumulo
+utility class. As always, the Accumulo developers take API compatibility
+very seriously and have invested much time to ensure that we meet the promises set forth to our users.&lt;/p&gt;
+
+&lt;h2 id=&quot;major-changes&quot;&gt;Major Changes&lt;/h2&gt;
+
+&lt;h3 id=&quot;problem-with-scans-right-after-minor-compaction&quot;&gt;Problem with scans right after minor compaction&lt;/h3&gt;
+
+&lt;p&gt;A bug was found when 2 or more concurrent scans run on a tablet that
+has just undergone minor compaction. The minor compaction thread
+writes the in-memory map to a local temporary rfile and tries to
+switch the current iterators to use it instead of the native map. The
+iterator code in the scan thread may also switch itself to use the local
+temporary rfile it if notices it before the minor compaction threads
+performs the switch. The bug happened shortly after the switch when
+one of the iterator threads will get a NegativeArraySizeException.
+See &lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4483&quot;&gt;ACCUMULO-4483&lt;/a&gt; for more info.&lt;/p&gt;
+
+&lt;h3 id=&quot;tablet-server-performance-improvement&quot;&gt;Tablet Server Performance Improvement&lt;/h3&gt;
+
+&lt;p&gt;&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4458&quot;&gt;ACCUMULO-4458&lt;/a&gt; mitigated some contention on the Hadoop 
+configuration instance backing the XML configs read for SiteConfiguration.&lt;br /&gt;
+This should improve overall Tablet Server performance.&lt;/p&gt;
+
+&lt;h3 id=&quot;synchronization-issue-with-deep-copies-of-sources&quot;&gt;Synchronization issue with deep copies of sources&lt;/h3&gt;
+
+&lt;p&gt;Deep copies of iterator sources were not thread safe and threw
+exceptions, mostly down in the ZlibDecompressor library.  The real bug
+was in the BoundedRangeFileInputStream.  The read() method
+synchronizes on the underlying FSDataInputStream, however the
+available() method did not.   See &lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4391&quot;&gt;ACCUMULO-4391&lt;/a&gt;.&lt;/p&gt;
+
+&lt;h3 id=&quot;system-permission-bug-in-thrift-proxy&quot;&gt;System permission bug in Thrift Proxy&lt;/h3&gt;
+
+&lt;p&gt;The Accumulo Proxy lacked support for the following system permissions:&lt;/p&gt;
+
+&lt;ul&gt;
+  &lt;li&gt;System.CREATE_NAMESPACE&lt;/li&gt;
+  &lt;li&gt;System.DROP_NAMESPACE&lt;/li&gt;
+  &lt;li&gt;System.ALTER_NAMESPACE&lt;/li&gt;
+  &lt;li&gt;System.OBTAIN_DELEGATION_TOKEN&lt;/li&gt;
+&lt;/ul&gt;
+
+&lt;p&gt;Ticket is &lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4519&quot;&gt;ACCUMULO-4519&lt;/a&gt;.&lt;/p&gt;
+
+&lt;h3 id=&quot;shell-compaction-file-selection-options-can-block&quot;&gt;Shell compaction file selection options can block&lt;/h3&gt;
+
+&lt;p&gt;The block happens when the tablet lock is held.  The tablet lock is
+meant to protect changes to the tablets internal metadata, and
+blocking operations should not occur while this lock is held.  The
+compaction command has options to select files based on some
+criteria, some of which required blocking operations.  This issue is
+fixed in &lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4572&quot;&gt;ACCUMULO-4572&lt;/a&gt;.&lt;/p&gt;
+
+&lt;h3 id=&quot;hostregextableloadbalancer-used-stale-information&quot;&gt;HostRegexTableLoadBalancer used stale information&lt;/h3&gt;
+
+&lt;p&gt;The HostRegexTableLoadBalander maintains an internal mapping of tablet
+server pools and tablet server status. It was updated at a
+configurable interval initially as an optimization. Unfortunately it
+had the negative side effect of providing the assignment and balance
+operations with stale information.  This lead to a constant shuffling
+of tablets.  The configuration property was removed so that
+assign/balance methods get updated information every time.  See
+&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4576&quot;&gt;ACCUMULO-4576&lt;/a&gt;.&lt;/p&gt;
+
+&lt;h3 id=&quot;modify-tableoperations-online-to-check-for-table-state&quot;&gt;Modify TableOperations online to check for table state&lt;/h3&gt;
+
+&lt;p&gt;The table operations online operation executes as a fate
+operation. If a transaction lock for the table is currently held,
+this operation will block even if no action is needed. 
+&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4574&quot;&gt;ACCUMULO-4574&lt;/a&gt; changes the behavior of the online
+operation to a NOOP if the table is already in the requested state.
+This returns immediately without queuing a fate operation.&lt;/p&gt;
+
+&lt;h2 id=&quot;other-notable-changes&quot;&gt;Other Notable Changes&lt;/h2&gt;
+
+&lt;ul&gt;
+  &lt;li&gt;&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4488&quot;&gt;ACCUMULO-4488&lt;/a&gt; Fix gap in user manual on Kerberos for clients&lt;/li&gt;
+  &lt;li&gt;&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-2724&quot;&gt;ACCUMULO-2724&lt;/a&gt; CollectTabletStats had multiple -t parameter&lt;/li&gt;
+  &lt;li&gt;&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4431&quot;&gt;ACCUMULO-4431&lt;/a&gt; Log what random is chosen for a tserver.&lt;/li&gt;
+  &lt;li&gt;&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4494&quot;&gt;ACCUMULO-4494&lt;/a&gt; Include column family seeks in the Iterator Test Harness&lt;/li&gt;
+  &lt;li&gt;&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4549&quot;&gt;ACCUMULO-4549&lt;/a&gt; Remove duplicate init functions in TabletBalancer&lt;/li&gt;
+  &lt;li&gt;&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4467&quot;&gt;ACCUMULO-4467&lt;/a&gt; Random Walk broken because of unmet dependency on commons-math&lt;/li&gt;
+  &lt;li&gt;&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4578&quot;&gt;ACCUMULO-4578&lt;/a&gt; Cancel compaction FATE operation does not release namespace lock&lt;/li&gt;
+  &lt;li&gt;&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4505&quot;&gt;ACCUMULO-4505&lt;/a&gt; Shell still reads accumulo-site.xml when using Zookeeper CLI options&lt;/li&gt;
+  &lt;li&gt;&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4535&quot;&gt;ACCUMULO-4535&lt;/a&gt; HostRegexTableLoadBalancer fails with NullPointerException&lt;/li&gt;
+  &lt;li&gt;&lt;a href=&quot;https://issues.apache.org/jira/browse/ACCUMULO-4575&quot;&gt;ACCUMULO-4575&lt;/a&gt; Concurrent table delete operations leave orphan fate transaction locks&lt;/li&gt;
+&lt;/ul&gt;
+
+&lt;h2 id=&quot;upgrading&quot;&gt;Upgrading&lt;/h2&gt;
+
+&lt;p&gt;Upgrades from 1.7 to 1.8 are possible with little effort as no changes were made at the data layer and RPC changes
+were made in a backwards-compatible way. The recommended way is to stop Accumulo 1.7, perform the Accumulo upgrade to
+1.8, and then start 1.8. Like previous versions, after 1.8 is started on a 1.7 instance, a one-time upgrade will
+happen by the Master which will prevent a downgrade back to 1.7. Upgrades are still one way. Upgrades from versions
+prior to 1.7 to 1.8 should follow the below path to 1.7 and then perform the upgrade to 1.8 – direct upgrades to 1.8
+for versions other than 1.7 are untested.&lt;/p&gt;
+
+&lt;p&gt;Existing configuration files from 1.7 should be compared against the examples provided in 1.8. The 1.7 configuration
+files should all function with 1.8 code, but you will likely want to include changes found in the 
+&lt;a href=&quot;/release/accumulo-1.8.0/&quot;&gt;1.8.0 release notes&lt;/a&gt; and these release notes for 1.8.1.&lt;/p&gt;
+
+&lt;p&gt;For upgrades from prior to 1.7, follow the upgrade instructions to 1.7 first.&lt;/p&gt;
+
+&lt;h2 id=&quot;testing&quot;&gt;Testing&lt;/h2&gt;
+
+&lt;p&gt;Each unit and functional test only runs on a single node, while the RandomWalk
+and Continuous Ingest tests run on any number of nodes. &lt;em&gt;Agitation&lt;/em&gt; refers to
+randomly restarting Accumulo processes and Hadoop Datanode processes, and, in
+HDFS High-Availability instances, forcing NameNode failover.&lt;/p&gt;
+
+&lt;table id=&quot;release_notes_testing&quot; class=&quot;table&quot;&gt;
+  &lt;thead&gt;
+    &lt;tr&gt;
+      &lt;th&gt;OS/Environment&lt;/th&gt;
+      &lt;th&gt;Hadoop&lt;/th&gt;
+      &lt;th&gt;Nodes&lt;/th&gt;
+      &lt;th&gt;ZooKeeper&lt;/th&gt;
+      &lt;th&gt;HDFS HA&lt;/th&gt;
+      &lt;th&gt;Tests&lt;/th&gt;
+    &lt;/tr&gt;
+  &lt;/thead&gt;
+  &lt;tbody&gt;
+    &lt;tr&gt;
+      &lt;td&gt;CentOS7/openJDK1.8.0_121/EC2; 1 m3.xlarge leader, 8 d2.xlarge workers&lt;/td&gt;
+      &lt;td&gt;2.7.3&lt;/td&gt;
+      &lt;td&gt;9&lt;/td&gt;
+      &lt;td&gt;3.4.9&lt;/td&gt;
+      &lt;td&gt;No&lt;/td&gt;
+      &lt;td&gt;24 HR Continuous Ingest without Agitation.&lt;/td&gt;
+    &lt;/tr&gt;
+    &lt;tr&gt;
+      &lt;td&gt;CentOS7/openJDK1.8.0_121/EC2; 1 m3.xlarge leader, 8 d2.xlarge workers&lt;/td&gt;
+      &lt;td&gt;2.7.3&lt;/td&gt;
+      &lt;td&gt;9&lt;/td&gt;
+      &lt;td&gt;3.4.9&lt;/td&gt;
+      &lt;td&gt;No&lt;/td&gt;
+      &lt;td&gt;24 HR Continuous Ingest with Agitation.&lt;/td&gt;
+    &lt;/tr&gt;
+  &lt;/tbody&gt;
+&lt;/table&gt;
+
+</description>
+        <pubDate>Sun, 26 Feb 2017 00:00:00 -0500</pubDate>
+        <link>https://accumulo.apache.org/release/accumulo-1.8.1/</link>
+        <guid isPermaLink="true">https://accumulo.apache.org/release/accumulo-1.8.1/</guid>
+        
+        
+        <category>release</category>
+        
+      </item>
+    
+      <item>
         <title>Running Accumulo on Fedora 25</title>
         <description>&lt;p&gt;Apache Accumulo has been available in &lt;a href=&quot;https://getfedora.org/&quot;&gt;Fedora&lt;/a&gt; since F20. Recently, the Fedora
 packages have been updated to Accumulo version &lt;code class=&quot;highlighter-rouge&quot;&gt;1.6.6&lt;/code&gt; and have made some

http://git-wip-us.apache.org/repos/asf/accumulo-website/blob/ccd797a9/index.html
----------------------------------------------------------------------
diff --git a/index.html b/index.html
index 0ff029d..bb1993a 100644
--- a/index.html
+++ b/index.html
@@ -157,15 +157,15 @@
         
         <div class="row latest-news-item">
           <div class="col-sm-12" style="margin-bottom: 5px">
-           <span style="font-size: 12px; margin-right: 5px;">Feb 2017</span>
-           <a href="/release/accumulo-1.8.1/">Apache Accumulo 1.8.1</a>
+           <span style="font-size: 12px; margin-right: 5px;">Mar 2017</span>
+           <a href="/blog/2017/03/06/security-performance-implications.html">Security Performance Implications</a>
           </div>
         </div>
         
         <div class="row latest-news-item">
           <div class="col-sm-12" style="margin-bottom: 5px">
            <span style="font-size: 12px; margin-right: 5px;">Feb 2017</span>
-           <a href="/blog/2017/02/23/security-performance-implications.html">Security Performance Implications</a>
+           <a href="/release/accumulo-1.8.1/">Apache Accumulo 1.8.1</a>
           </div>
         </div>
         

http://git-wip-us.apache.org/repos/asf/accumulo-website/blob/ccd797a9/news/index.html
----------------------------------------------------------------------
diff --git a/news/index.html b/news/index.html
index 2ffbe5c..eec8a27 100644
--- a/news/index.html
+++ b/news/index.html
@@ -149,15 +149,15 @@
   
   
   <div class="row" style="margin-top: 15px">
-    <div class="col-md-1">Feb 26</div>
-    <div class="col-md-10"><a href="/release/accumulo-1.8.1/">Apache Accumulo 1.8.1</a></div>
+    <div class="col-md-1">Mar 06</div>
+    <div class="col-md-10"><a href="/blog/2017/03/06/security-performance-implications.html">Security Performance Implications</a></div>
   </div>
 
   
   
   <div class="row" style="margin-top: 15px">
-    <div class="col-md-1">Feb 23</div>
-    <div class="col-md-10"><a href="/blog/2017/02/23/security-performance-implications.html">Security Performance Implications</a></div>
+    <div class="col-md-1">Feb 26</div>
+    <div class="col-md-10"><a href="/release/accumulo-1.8.1/">Apache Accumulo 1.8.1</a></div>
   </div>
 
   


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