Github user redsanket commented on a diff in the pull request:
https://github.com/apache/storm/pull/845#discussion_r45760156
--- Diff: storm-core/src/jvm/backtype/storm/blobstore/BlobStore.java ---
@@ -0,0 +1,446 @@
+/**
+ * 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 backtype.storm.blobstore;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.NoSuchElementException;
+import java.util.Set;
+import java.util.regex.Pattern;
+
+import javax.security.auth.Subject;
+
+import backtype.storm.nimbus.NimbusInfo;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import backtype.storm.daemon.Shutdownable;
+import backtype.storm.generated.AuthorizationException;
+import backtype.storm.generated.KeyNotFoundException;
+import backtype.storm.generated.KeyAlreadyExistsException;
+import backtype.storm.generated.ReadableBlobMeta;
+import backtype.storm.generated.SettableBlobMeta;
+
+/**
+ * Provides a way to store blobs that can be downloaded.
+ * Blobs must be able to be uploaded and listed from Nimbus,
+ * and downloaded from the Supervisors. It is a key value based
+ * store. Key being a string and value being the blob data.
+ *
+ * ACL checking must take place against the provided subject.
+ * If the blob store does not support Security it must validate
+ * that all ACLs set are always WORLD, everything.
+ *
+ * The users can upload their blobs through the blob store command
+ * line. The command line utilty also allows us to update,
+ * delete.
+ *
+ * Modifying the replication factor only works for HdfsBlobStore
+ * as for the LocalFsBlobStore the replication is dependent on
+ * the number of Nimbodes available.
+ */
+public abstract class BlobStore implements Shutdownable {
+ public static final Logger LOG =
LoggerFactory.getLogger(BlobStore.class);
+ private static final Pattern KEY_PATTERN = Pattern.compile("^[\\w
\\t\\.:_-]+$");
+ protected static final String BASE_BLOBS_DIR_NAME = "blobs";
+
+ /**
+ * Allows us to initialize the blob store
+ * @param conf The storm configuration
+ * @param baseDir The directory path to store the blobs
+ * @param nimbusInfo Contains the nimbus host, port and leadership
information.
+ */
+ public abstract void prepare(Map conf, String baseDir, NimbusInfo
nimbusInfo);
+
+ /**
+ * Creates the blob.
+ * @param key Key for the blob.
+ * @param meta Metadata which contains the acls information
+ * @param who Is the subject creating the blob.
+ * @return AtomicOutputStream returns a stream into which the data
+ * can be written into.
--- End diff --
@d2r addressed
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