[FIX] ReleaseException when the path is being written by multiple tas…

…ks (apache#3494)

* fix ReleaseException when the path is being written by multiple task

* Do not throw IOException if another replica wins the race for segment creation

fix if check

* handle logging comments

* fix test

extensions-core/hdfs-storage/src/main/java/io/druid/storage/hdfs/HdfsDataSegmentPusher.java

@@ -26,6 +26,7 @@
 import com.google.inject.Inject;
 import com.metamx.common.CompressionUtils;
 import com.metamx.common.logger.Logger;
+import io.druid.common.utils.UUIDUtils;
 import io.druid.segment.SegmentUtils;
 import io.druid.segment.loading.DataSegmentPusher;
 import io.druid.segment.loading.DataSegmentPusherUtil;
@@ -88,24 +89,49 @@ public DataSegment push(File inDir, DataSegment segment) throws IOException
         storageDir
     );
 
-    Path outFile = new Path(String.format("%s/%s/index.zip", config.getStorageDirectory(), storageDir));
-    FileSystem fs = outFile.getFileSystem(hadoopConfig);
+    Path tmpFile = new Path(String.format(
+        "%s/%s/index.zip",
+        config.getStorageDirectory(),
+        UUIDUtils.generateUuid()
+    ));
+    FileSystem fs = tmpFile.getFileSystem(hadoopConfig);
 
-    fs.mkdirs(outFile.getParent());
-    log.info("Compressing files from[%s] to [%s]", inDir, outFile);
+    fs.mkdirs(tmpFile.getParent());
+    log.info("Compressing files from[%s] to [%s]", inDir, tmpFile);
 
     final long size;
-    try (FSDataOutputStream out = fs.create(outFile)) {
+    final DataSegment dataSegment;
+    try (FSDataOutputStream out = fs.create(tmpFile)) {
       size = CompressionUtils.zip(inDir, out);
+      dataSegment = createDescriptorFile(
+          segment.withLoadSpec(makeLoadSpec(tmpFile))
+                 .withSize(size)
+                 .withBinaryVersion(SegmentUtils.getVersionFromDir(inDir)),
+          tmpFile.getParent(),
+          fs
+      );
+      Path outDir = new Path(String.format("%s/%s", config.getStorageDirectory(), storageDir));
+      if (!fs.rename(tmpFile.getParent(), outDir)) {
+        if (!fs.delete(tmpFile.getParent(), true)) {
+          log.error("Failed to delete temp directory[%s]", tmpFile);
+        }
+        if (fs.exists(outDir)) {
+          log.info(
+              "Unable to rename temp directory[%s] to segment directory[%s]. It is already pushed by a replica task.",
+              tmpFile,
+              outDir
+          );
+        } else {
+          throw new IOException(String.format(
+              "Failed to rename temp directory[%s] and segment directory[%s] is not present.",
+              tmpFile,
+              outDir
+          ));
+        }
+      }
     }
 
-    return createDescriptorFile(
-        segment.withLoadSpec(makeLoadSpec(outFile))
-               .withSize(size)
-               .withBinaryVersion(SegmentUtils.getVersionFromDir(inDir)),
-        outFile.getParent(),
-        fs
-    );
+    return dataSegment;
   }
 
   private DataSegment createDescriptorFile(DataSegment segment, Path outDir, final FileSystem fs) throws IOException

extensions-core/hdfs-storage/src/test/java/io/druid/storage/hdfs/HdfsDataSegmentPusherTest.java

@@ -23,16 +23,22 @@
 import com.google.common.collect.Maps;
 import com.google.common.io.Files;
 import io.druid.jackson.DefaultObjectMapper;
+import io.druid.segment.loading.DataSegmentPusherUtil;
 import io.druid.timeline.DataSegment;
 import io.druid.timeline.partition.NoneShardSpec;
 import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hdfs.web.resources.ExceptionHandler;
 import org.joda.time.Interval;
+import org.junit.AfterClass;
 import org.junit.Assert;
+import org.junit.BeforeClass;
 import org.junit.Rule;
 import org.junit.Test;
+import org.junit.internal.runners.statements.Fail;
 import org.junit.rules.TemporaryFolder;
 
 import java.io.File;
+import java.io.IOException;
 
 /**
  */
@@ -74,5 +80,21 @@ public void testPush() throws Exception
     DataSegment segment = pusher.push(segmentDir, segmentToPush);
 
     Assert.assertEquals(segmentToPush.getSize(), segment.getSize());
+
+    // rename directory after push
+    final String storageDir = DataSegmentPusherUtil.getHdfsStorageDir(segment);
+    File indexFile = new File(String.format("%s/%s/index.zip", config.getStorageDirectory(), storageDir));
+    Assert.assertTrue(indexFile.exists());
+    File descriptorFile = new File(String.format("%s/%s/descriptor.json", config.getStorageDirectory(), storageDir));
+    Assert.assertTrue(descriptorFile.exists());
+
+    // push twice will fail and temp dir cleaned
+    File outDir = new File(String.format("%s/%s", config.getStorageDirectory(), storageDir));
+    outDir.setReadOnly();
+    try {
+      pusher.push(segmentDir, segmentToPush);
+    }catch (IOException e){
+      Assert.fail("should not throw exception");
+    }
   }
 }