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From la...@apache.org
Subject hbase git commit: HBASE-16765 New SteppingRegionSplitPolicy, avoid too aggressive spread of regions for small tables.
Date Tue, 01 Nov 2016 20:10:12 GMT
Repository: hbase
Updated Branches:
  refs/heads/0.98 202405233 -> 4e12c5529


HBASE-16765 New SteppingRegionSplitPolicy, avoid too aggressive spread of regions for small
tables.


Project: http://git-wip-us.apache.org/repos/asf/hbase/repo
Commit: http://git-wip-us.apache.org/repos/asf/hbase/commit/4e12c552
Tree: http://git-wip-us.apache.org/repos/asf/hbase/tree/4e12c552
Diff: http://git-wip-us.apache.org/repos/asf/hbase/diff/4e12c552

Branch: refs/heads/0.98
Commit: 4e12c552950dc09d49a24012e9ccb44046ea323b
Parents: 2024052
Author: Lars Hofhansl <larsh@apache.org>
Authored: Tue Nov 1 13:09:52 2016 -0700
Committer: Lars Hofhansl <larsh@apache.org>
Committed: Tue Nov 1 13:09:52 2016 -0700

----------------------------------------------------------------------
 ...IncreasingToUpperBoundRegionSplitPolicy.java |  4 +--
 .../hbase/regionserver/SteppingSplitPolicy.java | 32 ++++++++++++++++++++
 2 files changed, 34 insertions(+), 2 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hbase/blob/4e12c552/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/IncreasingToUpperBoundRegionSplitPolicy.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/IncreasingToUpperBoundRegionSplitPolicy.java
b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/IncreasingToUpperBoundRegionSplitPolicy.java
index 7fbb73f..79b740c 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/IncreasingToUpperBoundRegionSplitPolicy.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/IncreasingToUpperBoundRegionSplitPolicy.java
@@ -43,7 +43,7 @@ public class IncreasingToUpperBoundRegionSplitPolicy
 extends ConstantSizeRegionSplitPolicy {
   static final Log LOG =
     LogFactory.getLog(IncreasingToUpperBoundRegionSplitPolicy.class);
-  private long initialSize;
+  protected long initialSize;
 
   @Override
   protected void configureForRegion(HRegion region) {
@@ -93,7 +93,7 @@ extends ConstantSizeRegionSplitPolicy {
   }
 
   /**
-   * @return Region max size or <code>count of regions squared * flushsize, which ever
is
+   * @return Region max size or <code>count of regions cubed * flushsize * 2, which
ever is
    * smaller; guard against there being zero regions on this server.
    */
   protected long getSizeToCheck(final int tableRegionsCount) {

http://git-wip-us.apache.org/repos/asf/hbase/blob/4e12c552/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/SteppingSplitPolicy.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/SteppingSplitPolicy.java
b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/SteppingSplitPolicy.java
new file mode 100644
index 0000000..4f3e0f2
--- /dev/null
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/SteppingSplitPolicy.java
@@ -0,0 +1,32 @@
+/**
+ * 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.hadoop.hbase.regionserver;
+
+public class SteppingSplitPolicy extends IncreasingToUpperBoundRegionSplitPolicy {
+  /**
+   * @return flushSize * 2 if there's exactly one region of the table in question
+   * found on this regionserver. Otherwise max file size.
+   * This allows a table to spread quickly across servers, while avoiding creating
+   * too many regions.
+   */
+  protected long getSizeToCheck(final int tableRegionsCount) {
+    return tableRegionsCount == 1  ? this.initialSize : getDesiredMaxFileSize();
+  }
+
+
+}


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