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FetchEntriesStreamRequestHandler.java
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FetchEntriesStreamRequestHandler.java
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/*
* Copyright 2013 LinkedIn, Inc
*
* Licensed 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 voldemort.server.protocol.admin;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.List;
import voldemort.client.protocol.pb.ProtoUtils;
import voldemort.client.protocol.pb.VAdminProto;
import voldemort.client.protocol.pb.VAdminProto.FetchPartitionEntriesRequest;
import voldemort.server.StoreRepository;
import voldemort.server.VoldemortConfig;
import voldemort.store.ErrorCodeMapper;
import voldemort.store.metadata.MetadataStore;
import voldemort.store.stats.StreamingStats.Operation;
import voldemort.utils.ByteArray;
import voldemort.utils.NetworkClassLoader;
import voldemort.utils.StoreInstance;
import voldemort.versioning.Versioned;
import com.google.protobuf.Message;
/**
* Fetches entries by scanning entire storage engine in storage-order.
* <p>
* For performance reason use storageEngine.keys() iterator to filter out
* unwanted keys and then call storageEngine.get() for valid keys.
* <p>
*/
public class FetchEntriesStreamRequestHandler extends FetchItemsStreamRequestHandler {
public FetchEntriesStreamRequestHandler(FetchPartitionEntriesRequest request,
MetadataStore metadataStore,
ErrorCodeMapper errorCodeMapper,
VoldemortConfig voldemortConfig,
StoreRepository storeRepository,
NetworkClassLoader networkClassLoader) {
super(request,
metadataStore,
errorCodeMapper,
voldemortConfig,
storeRepository,
networkClassLoader,
Operation.FETCH_ENTRIES);
logger.info("Starting fetch entries for store '" + storageEngine.getName()
+ "' with replica to partition mapping " + replicaToPartitionList);
}
@Override
public StreamRequestHandlerState handleRequest(DataInputStream inputStream,
DataOutputStream outputStream)
throws IOException {
if(!keyIterator.hasNext()) {
return StreamRequestHandlerState.COMPLETE;
}
// NOTE: Storage time is accounted for somewhat incorrectly because
// .hasNext() is invoked at end of method for the common case.
// Since key reading (keyIterator.next()) is done separately from entry
// fetching (storageEngine.get()), must be careful about when to invoke
// reportStorageOpTime and when to invoke maybeThrottle().
long startNs = System.nanoTime();
ByteArray key = keyIterator.next();
// Cannot invoke 'throttler.maybeThrottle(key.length());' here since
// that would affect timing measurements of storage operations.
boolean entryAccepted = false;
if(!fetchOrphaned) {
if(keyIsNeeded(key.get())) {
entryAccepted = true;
}
} else {
if(!StoreInstance.checkKeyBelongsToNode(key.get(), nodeId, initialCluster, storeDef)) {
entryAccepted = true;
}
}
if(entryAccepted) {
List<Versioned<byte[]>> values = storageEngine.get(key, null);
reportStorageOpTime(startNs);
throttler.maybeThrottle(key.length());
for(Versioned<byte[]> value: values) {
if(filter.accept(key, value)) {
keyFetched(key.get());
VAdminProto.FetchPartitionEntriesResponse.Builder response = VAdminProto.FetchPartitionEntriesResponse.newBuilder();
VAdminProto.PartitionEntry partitionEntry = VAdminProto.PartitionEntry.newBuilder()
.setKey(ProtoUtils.encodeBytes(key))
.setVersioned(ProtoUtils.encodeVersioned(value))
.build();
response.setPartitionEntry(partitionEntry);
Message message = response.build();
sendMessage(outputStream, message);
throttler.maybeThrottle(AdminServiceRequestHandler.valueSize(value));
}
}
} else {
reportStorageOpTime(startNs);
throttler.maybeThrottle(key.length());
}
// log progress
scanned++;
if(0 == scanned % STAT_RECORDS_INTERVAL) {
progressInfoMessage("Fetch entries (progress)");
}
if(keyIterator.hasNext() && !fetchedEnough()) {
return StreamRequestHandlerState.WRITING;
} else {
logger.info("Finished fetch entries for store '" + storageEngine.getName()
+ "' with replica to partition mapping " + replicaToPartitionList);
progressInfoMessage("Fetch entries (end of scan)");
return StreamRequestHandlerState.COMPLETE;
}
}
@Override
public final void close(DataOutputStream outputStream) throws IOException {
if(null != keyIterator)
keyIterator.close();
super.close(outputStream);
}
}