[GitHub] [ozone] elek commented on a change in pull request #2335: HDDS-4940 : EC: Implement the ECKeyOutputStream which should handle the EC mode writes.

[GitBox <gi...@apache.org>]

elek commented on a change in pull request #2335:
URL: https://github.com/apache/ozone/pull/2335#discussion_r652815649



##########
File path: hadoop-ozone/client/src/main/java/org/apache/hadoop/ozone/client/io/ECKeyOutputStream.java
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@@ -0,0 +1,663 @@
+/*
+ * 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.ozone.client.io;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FSExceptionMessages;
+import org.apache.hadoop.fs.FileEncryptionInfo;
+import org.apache.hadoop.hdds.client.ReplicationConfig;
+import org.apache.hadoop.hdds.protocol.DatanodeDetails;
+import org.apache.hadoop.hdds.scm.OzoneClientConfig;
+import org.apache.hadoop.hdds.scm.XceiverClientFactory;
+import org.apache.hadoop.hdds.scm.client.HddsClientUtils;
+import org.apache.hadoop.hdds.scm.container.common.helpers.ExcludeList;
+import org.apache.hadoop.hdfs.protocol.SystemErasureCodingPolicies;
+import org.apache.hadoop.io.ByteBufferPool;
+import org.apache.hadoop.io.ElasticByteBufferPool;
+import org.apache.hadoop.io.erasurecode.CodecUtil;
+import org.apache.hadoop.io.erasurecode.ECSchema;
+import org.apache.hadoop.io.erasurecode.ErasureCodecOptions;
+import org.apache.hadoop.io.erasurecode.codec.RSErasureCodec;
+import org.apache.hadoop.io.erasurecode.rawcoder.RawErasureEncoder;
+import org.apache.hadoop.io.retry.RetryPolicy;
+import org.apache.hadoop.ozone.om.helpers.OmKeyInfo;
+import org.apache.hadoop.ozone.om.helpers.OmKeyLocationInfo;
+import org.apache.hadoop.ozone.om.helpers.OmKeyLocationInfoGroup;
+import org.apache.hadoop.ozone.om.helpers.OmMultipartCommitUploadPartInfo;
+import org.apache.hadoop.ozone.om.helpers.OpenKeySession;
+import org.apache.hadoop.ozone.om.protocol.OzoneManagerProtocol;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Preconditions;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * ECKeyOutputStream handles the EC writes by writing the data into underlying
+ * block output streams chunk by chunk.
+ */
+public class ECKeyOutputStream extends KeyOutputStream {
+  private OzoneClientConfig config;
+  private ECChunkBuffers ecChunkBufferCache;
+  private int cellSize = 1000;
+  private int numDataBlks = 3;
+  private int numParityBlks = 2;
+  private static final ByteBufferPool BUFFER_POOL = new ElasticByteBufferPool();
+  private final RawErasureEncoder encoder;
+  // TODO: EC: Currently using the below EC Schema. This has to be modified and
+  //  created dynamically once OM return the configured scheme details.
+  private static final String DEFAULT_CODEC_NAME = "rs";
+  private ECSchema schema =
+      new ECSchema(DEFAULT_CODEC_NAME, numDataBlks, numParityBlks);
+  private ErasureCodecOptions options = new ErasureCodecOptions(schema);
+  private RSErasureCodec codec =
+      new RSErasureCodec(new Configuration(), options);

Review comment:
       new Configuration()




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