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Subject svn commit: r1680535 - /accumulo/site/trunk/content/release_notes/1.7.0.mdtext
Date Wed, 20 May 2015 12:09:53 GMT
Author: ecn
Date: Wed May 20 12:09:53 2015
New Revision: 1680535

CMS commit to accumulo by ecn


Modified: accumulo/site/trunk/content/release_notes/1.7.0.mdtext
--- accumulo/site/trunk/content/release_notes/1.7.0.mdtext (original)
+++ accumulo/site/trunk/content/release_notes/1.7.0.mdtext Wed May 20 12:09:53 2015
@@ -168,20 +168,13 @@ using Accumulo's public API. The regular
 ## Configurable Threadpool Size for Assignments ##
-One of the primary tasks that the Accumulo Master is responsible for is the
-assignment of tablets to tablet servers. Before a tablet can be brought
-online, it must not have any outstanding logs because this represents a need
-to perform recovery (the tablet was not unloaded cleanly). This process can
-take some time for large write-ahead log files, so it is performed on a tablet
-server to keep the Master light and agile.
+During start-up, the Master quickly assigns tablets to Tablet Servers. However,
+Tablet Servers load those assigned tablets one at a time. In 1.7, the servers
+will be more aggressive, and will load tablets in parallel, so long as they do
+not have mutations that need to be recovered.
-Assignments, whether the tablets need to perform recovery or not, share the
-same threadpool in the Master. This means that when a large number of tablet
-servers are available, too few threads dedicated to assignment can restrict
-the speed at which assignments can be performed.
-[ACCUMULO-1085][ACCUMULO-1085] allows the size of the threadpool used in the
-Master for assignments to be configurable which can be dynamically altered to
-remove the limitation when sufficient servers are available.
+[ACCUMULO-1085] allows the size of the threadpool used in the Tablet Servers 
+for assignment processing to be configurable.
 ## Group-Commit Threshold as a Factor of Data Size ##

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