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https://issues.apache.org/jira/browse/ACCUMULO-4173?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15237212#comment-15237212
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ASF GitHub Bot commented on ACCUMULO-4173:
------------------------------------------
Github user joshelser commented on a diff in the pull request:
https://github.com/apache/accumulo/pull/83#discussion_r59381530
--- Diff:
server/base/src/main/java/org/apache/accumulo/server/master/balancer/HostRegexTableLoadBalancer.java
---
@@ -0,0 +1,334 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.accumulo.server.master.balancer;
+
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Set;
+import java.util.SortedMap;
+import java.util.TreeMap;
+import java.util.regex.Pattern;
+
+import org.apache.accumulo.core.client.admin.TableOperations;
+import org.apache.accumulo.core.conf.AccumuloConfiguration;
+import org.apache.accumulo.core.conf.Property;
+import org.apache.accumulo.core.data.impl.KeyExtent;
+import org.apache.accumulo.core.master.thrift.TabletServerStatus;
+import org.apache.accumulo.core.tabletserver.thrift.TabletStats;
+import org.apache.accumulo.server.conf.ServerConfiguration;
+import org.apache.accumulo.server.master.state.TServerInstance;
+import org.apache.accumulo.server.master.state.TabletMigration;
+import org.apache.thrift.TException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * This balancer will create pools of tablet servers by grouping tablet
servers that match a regex into the same pool and calling the balancer set on
the table
--- End diff --
Nit: this is more about how it is implemented than what it does. "This
balancer creates groups of tabletservers, using user-provided regular
expressions over the tabletservers' hostnames, and then delegates to another
TableBalancer for each group of tabletserver" (or something).
> Balance table within a set of hosts
> -----------------------------------
>
> Key: ACCUMULO-4173
> URL: https://issues.apache.org/jira/browse/ACCUMULO-4173
> Project: Accumulo
> Issue Type: Improvement
> Components: master
> Reporter: Dave Marion
> Assignee: Dave Marion
> Labels: balancer
> Fix For: 1.8.0
>
> Attachments: ACCUMULO-4173-1.patch, ACCUMULO-4173-2.patch
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Create a table balancer that will provide a set of hosts for the table tablet
> balancer to use.
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