Github user redsanket commented on a diff in the pull request:
https://github.com/apache/storm/pull/845#discussion_r46094374
--- Diff: storm-core/src/jvm/backtype/storm/blobstore/NimbusBlobStore.java
---
@@ -0,0 +1,408 @@
+/**
+ * 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 backtype.storm.Config;
+import backtype.storm.generated.AuthorizationException;
+import backtype.storm.generated.BeginDownloadResult;
+import backtype.storm.generated.ListBlobsResult;
+import backtype.storm.generated.ReadableBlobMeta;
+import backtype.storm.generated.SettableBlobMeta;
+import backtype.storm.generated.KeyAlreadyExistsException;
+import backtype.storm.generated.KeyNotFoundException;
+import backtype.storm.utils.NimbusClient;
+import backtype.storm.utils.Utils;
+import org.apache.thrift.TException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.NoSuchElementException;
+
+public class NimbusBlobStore extends ClientBlobStore {
+ private static final Logger LOG =
LoggerFactory.getLogger(NimbusBlobStore.class);
+
+ public class NimbusKeyIterator implements Iterator<String> {
+ private ListBlobsResult listBlobs = null;
+ private int offset = 0;
+ private boolean eof = false;
+
+ public NimbusKeyIterator(ListBlobsResult listBlobs) {
+ this.listBlobs = listBlobs;
+ this.eof = (listBlobs.get_keys_size() == 0);
+ }
+
+ private boolean isCacheEmpty() {
+ return listBlobs.get_keys_size() <= offset;
+ }
+
+ private void readMore() {
+ if (!eof) {
+ try {
+ offset = 0;
+ synchronized(client) {
+ listBlobs =
client.getClient().listBlobs(listBlobs.get_session());
+ }
+ if (listBlobs.get_keys_size() == 0) {
+ eof = true;
+ }
+ } catch (TException e) {
+ throw new RuntimeException(e);
+ }
+ }
+ }
+
+ @Override
+ public synchronized boolean hasNext() {
+ if (isCacheEmpty()) {
+ readMore();
+ }
+ return !eof;
+ }
+
+ @Override
+ public synchronized String next() {
+ if (!hasNext()) {
+ throw new NoSuchElementException();
+ }
+ String ret = listBlobs.get_keys().get(offset);
+ offset++;
+ return ret;
+ }
+
+ @Override
+ public void remove() {
+ throw new UnsupportedOperationException("Delete Not Supported");
+ }
+ }
+
+ public class NimbusDownloadInputStream extends InputStreamWithMeta {
+ private BeginDownloadResult beginBlobDownload;
+ private byte[] buffer = null;
+ private int offset = 0;
+ private int end = 0;
+ private boolean eof = false;
+
+ public NimbusDownloadInputStream(BeginDownloadResult
beginBlobDownload) {
+ this.beginBlobDownload = beginBlobDownload;
+ }
+
+ @Override
+ public long getVersion() throws IOException {
+ return beginBlobDownload.get_version();
+ }
+
+ @Override
+ public synchronized int read() throws IOException {
+ if (isEmpty()) {
+ readMore();
+ if (eof) {
+ return -1;
+ }
+ }
+ int length = Math.min(1, available());
+ if (length == 0) {
+ return -1;
+ }
+ int ret = buffer[offset];
+ offset += length;
+ return ret;
+ }
+
+ @Override
+ public synchronized int read(byte[] b, int off, int len) throws
IOException {
+ if (isEmpty()) {
+ readMore();
+ if (eof) {
+ return -1;
+ }
+ }
+ int length = Math.min(len, available());
+ System.arraycopy(buffer, offset, b, off, length);
+ offset += length;
+ return length;
+ }
+
+ private boolean isEmpty() {
+ return buffer == null || offset >= end;
+ }
+
+ private void readMore() {
+ if (!eof) {
+ try {
+ ByteBuffer buff;
+ synchronized(client) {
+ buff =
client.getClient().downloadBlobChunk(beginBlobDownload.get_session());
+ }
+ buffer = buff.array();
+ offset = buff.arrayOffset() + buff.position();
+ int length = buff.remaining();
+ end = offset + length;
+ if (length == 0) {
+ eof = true;
+ }
+ } catch (TException e) {
+ throw new RuntimeException(e);
+ }
+ }
+ }
+
+ @Override
+ public synchronized int read(byte[] b) throws IOException {
+ return read(b, 0, b.length);
+ }
+
+ @Override
+ public synchronized int available() {
+ return buffer == null ? 0 : (end - offset);
+ }
+
+ @Override
+ public long getFileLength() {
+ return beginBlobDownload.get_data_size();
+ }
+ }
+
+ public class NimbusUploadAtomicOutputStream extends AtomicOutputStream {
+ private String session;
+ private int maxChunkSize = 4096;
+ private String key;
+
+ public NimbusUploadAtomicOutputStream(String session, int bufferSize,
String key) {
+ this.session = session;
+ this.maxChunkSize = bufferSize;
+ this.key = key;
+ }
+
+ @Override
+ public void cancel() throws IOException {
+ try {
+ synchronized(client) {
+ client.getClient().cancelBlobUpload(session);
+ }
+ } catch (TException e) {
+ throw new RuntimeException(e);
+ }
+ }
+
+ @Override
+ public void write(int b) throws IOException {
+ try {
+ synchronized(client) {
+ client.getClient().uploadBlobChunk(session, ByteBuffer.wrap(new
byte[] {(byte)b}));
+ }
+ } catch (TException e) {
+ throw new RuntimeException(e);
+ }
+ }
+
+ @Override
+ public void write(byte []b) throws IOException {
+ write(b, 0, b.length);
+ }
+
+ @Override
+ public void write(byte []b, int offset, int len) throws IOException {
+ try {
+ int end = offset + len;
+ for (int realOffset = offset; realOffset < end; realOffset +=
maxChunkSize) {
+ int realLen = Math.min(end - realOffset, maxChunkSize);
+ LOG.debug("Writing {} bytes of {}
remaining",realLen,(end-realOffset));
+ synchronized(client) {
+ client.getClient().uploadBlobChunk(session, ByteBuffer.wrap(b,
realOffset, realLen));
+ }
+ }
+ } catch (TException e) {
+ throw new RuntimeException(e);
+ }
+ }
+
+ @Override
+ public void close() throws IOException {
+ try {
+ synchronized(client) {
+ client.getClient().finishBlobUpload(session);
+ client.getClient().createStateInZookeeper(key);
+ }
+ } catch (TException e) {
+ throw new RuntimeException(e);
+ }
+ }
+ }
+
+ private NimbusClient client;
+ private int bufferSize = 4096;
+
+ @Override
+ public void prepare(Map conf) {
+ this.client = NimbusClient.getConfiguredClient(conf);
+ if (conf != null) {
+ this.bufferSize =
Utils.getInt(conf.get(Config.STORM_BLOBSTORE_INPUTSTREAM_BUFFER_SIZE_BYTES),
bufferSize);
+ }
+ }
+
+ @Override
+ protected AtomicOutputStream createBlobToExtend(String key,
SettableBlobMeta meta)
+ throws AuthorizationException, KeyAlreadyExistsException {
+ try {
+ synchronized(client) {
+ return new
NimbusUploadAtomicOutputStream(client.getClient().beginCreateBlob(key, meta),
this.bufferSize, key);
+ }
+ } catch (AuthorizationException | KeyAlreadyExistsException exp) {
--- End diff --
Here Authorization and KeyAlreadyExists are TExceptions as per thrift.
Therefore, we will not be able to catch specfic exceptions and log them higher
up in the stack
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