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From GitBox <...@apache.org>
Subject [GitHub] [phoenix] dbwong commented on a change in pull request #482: PHOENIX-4925 Use Segment tree to organize Guide Post Info
Date Sat, 13 Apr 2019 00:15:40 GMT
dbwong commented on a change in pull request #482: PHOENIX-4925 Use Segment tree to organize
Guide Post Info
URL: https://github.com/apache/phoenix/pull/482#discussion_r275092450
 
 

 ##########
 File path: phoenix-core/src/main/java/org/apache/phoenix/schema/stats/GuidePostEstimation.java
 ##########
 @@ -0,0 +1,89 @@
+package org.apache.phoenix.schema.stats;
+
+import org.apache.phoenix.util.SizedUtil;
+
+public final class GuidePostEstimation {
+    /**
+     * The byte count of the guide post
+     */
+    private long byteCount;
+
+    /**
+     * The row count of the guide post
+     */
+    private long rowCount;
+
+    /**
+     * The timestamp at which the guide post was created/updated
+     */
+    private long timestamp;
+
+    public GuidePostEstimation() {
+        this(0, 0, Long.MAX_VALUE);
+    }
+
+    public GuidePostEstimation(long byteCount, long rowCount, long timestamp) {
+        this.byteCount = byteCount;
+        this.rowCount = rowCount;
+        this.timestamp = timestamp;
+    }
+
+    public static int getEstimatedSize() {
+        return SizedUtil.LONG_SIZE * 3;
+    }
+
+    /**
+     * Merge the two guide post estimation objects into one which contains the sum of rows,
+     * the sum of bytes and the least update time stamp of the two objects.
+     * @param left
+     * @param right
+     * @return the new guide post estimation object which contains the "Sum" info.
+     */
+    public static GuidePostEstimation merge(GuidePostEstimation left, GuidePostEstimation
right) {
 
 Review comment:
   Dislike static for testing.

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