[GitHub] [hbase] bbeaudreault commented on a change in pull request #3803: HBASE-26304: Reflect out of band locality improvements in metrics and balancer

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bbeaudreault commented on a change in pull request #3803:
URL: https://github.com/apache/hbase/pull/3803#discussion_r738630776



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File path: hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/InputStreamBlockDistribution.java
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@@ -0,0 +1,91 @@
+/**
+ * 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;
+
+import java.io.IOException;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hbase.HDFSBlocksDistribution;
+import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
+import org.apache.hadoop.hbase.util.FSUtils;
+import org.apache.hadoop.hdfs.client.HdfsDataInputStream;
+import org.apache.yetus.audience.InterfaceAudience;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Computes the HDFSBlockDistribution for a file based on the underlying located blocks
+ * for an HdfsDataInputStream reading that file. This computation may involve a call to
+ * the namenode, so the value is cached based on
+ * {@link #HBASE_LOCALITY_INPUTSTREAM_DERIVE_CACHE_PERIOD}.
+ */
+@InterfaceAudience.Private
+public class InputStreamBlockDistribution {

Review comment:
       I did not add a test for this class, because it's so simple in nature. I did add a test for the FSUtils change, which this class mostly delegates to.  If someone would prefer I add a test here as well please let me know.




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