Merge pull request #1659 from himanshug/segment_kill_update

on kill segment, dont leave version, interval and dataSource dir behind on HDFS

extensions/hdfs-storage/src/main/java/io/druid/storage/hdfs/HdfsDataSegmentKiller.java

@@ -44,8 +44,25 @@ public class HdfsDataSegmentKiller implements DataSegmentKiller
     final FileSystem fs = checkPathAndGetFilesystem(path);
     try {
       if (path.getName().endsWith(".zip")) {
-        // delete the parent directory containing the zip file and the descriptor
-        fs.delete(path.getParent(), true);
+
+        // path format -- > .../dataSource/interval/version/partitionNum/xxx.zip
+        Path partitionNumDir = path.getParent();
+        if (!fs.delete(partitionNumDir, true)) {
+          throw new SegmentLoadingException(
+              "Unable to kill segment, failed to delete dir [%s]",
+              partitionNumDir.toString()
+          );
+        }
+
+        //try to delete other directories if possible
+        Path versionDir = partitionNumDir.getParent();
+        if (safeNonRecursiveDelete(fs, versionDir)) {
+          Path intervalDir = versionDir.getParent();
+          if (safeNonRecursiveDelete(fs, intervalDir)) {
+            Path dataSourceDir = intervalDir.getParent();
+            safeNonRecursiveDelete(fs, dataSourceDir);
+          }
+        }
       } else {
         throw new SegmentLoadingException("Unknown file type[%s]", path);
       }
@@ -55,6 +72,16 @@ public class HdfsDataSegmentKiller implements DataSegmentKiller
     }
   }
 
+  private boolean safeNonRecursiveDelete(FileSystem fs, Path path)
+  {
+    try {
+      return fs.delete(path, false);
+    }
+    catch (Exception ex) {
+      return false;
+    }
+  }
+
   private Path getPath(DataSegment segment)
   {
     return new Path(String.valueOf(segment.getLoadSpec().get("path")));

extensions/hdfs-storage/src/test/java/io/druid/storage/hdfs/HdfsDataSegmentKillerTest.java

@@ -0,0 +1,122 @@
+/*
+* Licensed to Metamarkets Group Inc. (Metamarkets) under one
+* or more contributor license agreements. See the NOTICE file
+* distributed with this work for additional information
+* regarding copyright ownership. Metamarkets 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 io.druid.storage.hdfs;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+import io.druid.timeline.DataSegment;
+import io.druid.timeline.partition.NoneShardSpec;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FSDataOutputStream;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.joda.time.Interval;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.io.IOException;
+
+/**
+ */
+public class HdfsDataSegmentKillerTest
+{
+  @Test
+  public void testKill() throws Exception
+  {
+    Configuration config = new Configuration();
+    HdfsDataSegmentKiller killer = new HdfsDataSegmentKiller(config);
+
+    FileSystem fs = FileSystem.get(config);
+
+    // Create following segments and then delete them in this order and assert directory deletions
+    // /tmp/dataSource/interval1/v1/0/index.zip
+    // /tmp/dataSource/interval1/v1/1/index.zip
+    // /tmp/dataSource/interval1/v2/0/index.zip
+    // /tmp/dataSource/interval2/v1/0/index.zip
+
+    Path dataSourceDir = new Path("/tmp/dataSource");
+
+    Path interval1Dir = new Path(dataSourceDir, "interval1");
+    Path version11Dir = new Path(interval1Dir, "v1");
+    Path partition011Dir = new Path(version11Dir, "0");
+    Path partition111Dir = new Path(version11Dir, "1");
+
+    makePartitionDirWithIndex(fs, partition011Dir);
+    makePartitionDirWithIndex(fs, partition111Dir);
+
+    Path version21Dir = new Path(interval1Dir, "v2");
+    Path partition021Dir = new Path(version21Dir, "0");
+
+    makePartitionDirWithIndex(fs, partition021Dir);
+
+    Path interval2Dir = new Path(dataSourceDir, "interval2");
+    Path version12Dir = new Path(interval2Dir, "v1");
+    Path partition012Dir = new Path(version12Dir, "0");
+
+    makePartitionDirWithIndex(fs, partition012Dir);
+
+    killer.kill(getSegmentWithPath(new Path(partition011Dir, "index.zip").toString()));
+
+    Assert.assertFalse(fs.exists(partition011Dir));
+    Assert.assertTrue(fs.exists(partition111Dir));
+    Assert.assertTrue(fs.exists(partition021Dir));
+    Assert.assertTrue(fs.exists(partition012Dir));
+
+    killer.kill(getSegmentWithPath(new Path(partition111Dir, "index.zip").toString()));
+
+    Assert.assertFalse(fs.exists(version11Dir));
+    Assert.assertTrue(fs.exists(partition021Dir));
+    Assert.assertTrue(fs.exists(partition012Dir));
+
+    killer.kill(getSegmentWithPath(new Path(partition021Dir, "index.zip").toString()));
+
+    Assert.assertFalse(fs.exists(interval1Dir));
+    Assert.assertTrue(fs.exists(partition012Dir));
+
+    killer.kill(getSegmentWithPath(new Path(partition012Dir, "index.zip").toString()));
+
+    Assert.assertFalse(fs.exists(dataSourceDir));
+  }
+
+  private void makePartitionDirWithIndex(FileSystem fs, Path path) throws IOException
+  {
+    Assert.assertTrue(fs.mkdirs(path));
+    try (FSDataOutputStream os = fs.create(new Path(path, "index.zip"))) {
+    }
+  }
+
+  private DataSegment getSegmentWithPath(String path)
+  {
+    return new DataSegment(
+        "dataSource",
+        Interval.parse("2000/3000"),
+        "ver",
+        ImmutableMap.<String, Object>of(
+            "type", "hdfs",
+            "path", path
+        ),
+        ImmutableList.of("product"),
+        ImmutableList.of("visited_sum", "unique_hosts"),
+        new NoneShardSpec(),
+        9,
+        12334
+    );
+  }
+}