/**
* 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.bookkeeper.proto;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import org.apache.bookkeeper.bookie.Bookie;
import org.apache.bookkeeper.bookie.BookieException;
import org.apache.bookkeeper.proto.BookkeeperProtocol.ReadRequest;
import org.apache.bookkeeper.proto.BookkeeperProtocol.ReadResponse;
import org.apache.bookkeeper.proto.BookkeeperProtocol.Request;
import org.apache.bookkeeper.proto.BookkeeperProtocol.Response;
import org.apache.bookkeeper.proto.BookkeeperProtocol.StatusCode;
import org.apache.bookkeeper.util.MathUtils;
import org.jboss.netty.channel.Channel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.protobuf.ByteString;
class ReadEntryProcessorV3 extends PacketProcessorBaseV3 {
private final static Logger LOG = LoggerFactory.getLogger(ReadEntryProcessorV3.class);
public ReadEntryProcessorV3(Request request, Channel channel,
BookieRequestProcessor requestProcessor) {
super(request, channel, requestProcessor);
}
private ReadResponse getReadResponse() {
long startTimeNanos = MathUtils.nowInNano();
ReadRequest readRequest = request.getReadRequest();
long ledgerId = readRequest.getLedgerId();
long entryId = readRequest.getEntryId();
ReadResponse.Builder readResponse = ReadResponse.newBuilder()
.setLedgerId(ledgerId)
.setEntryId(entryId);
if (!isVersionCompatible()) {
readResponse.setStatus(StatusCode.EBADVERSION);
return readResponse.build();
}
LOG.debug("Received new read request: {}", request);
StatusCode status;
ByteBuffer entryBody;
try {
Future<Boolean> fenceResult = null;
if (readRequest.hasFlag() && readRequest.getFlag().equals(ReadRequest.Flag.FENCE_LEDGER)) {
LOG.warn("Ledger fence request received for ledger: {} from address: {}", ledgerId,
channel.getRemoteAddress());
if (readRequest.hasMasterKey()) {
byte[] masterKey = readRequest.getMasterKey().toByteArray();
fenceResult = requestProcessor.bookie.fenceLedger(ledgerId, masterKey);
} else {
LOG.error("Fence ledger request received without master key for ledger:{} from address: {}",
ledgerId, channel.getRemoteAddress());
throw BookieException.create(BookieException.Code.UnauthorizedAccessException);
}
}
entryBody = requestProcessor.bookie.readEntry(ledgerId, entryId);
if (null != fenceResult) {
// TODO:
// currently we don't have readCallback to run in separated read
// threads. after BOOKKEEPER-429 is complete, we could improve
// following code to make it not wait here
//
// For now, since we only try to wait after read entry. so writing
// to journal and read entry are executed in different thread
// it would be fine.
try {
Boolean fenced = fenceResult.get(1000, TimeUnit.MILLISECONDS);
if (null == fenced || !fenced) {
// if failed to fence, fail the read request to make it retry.
status = StatusCode.EIO;
} else {
status = StatusCode.EOK;
readResponse.setBody(ByteString.copyFrom(entryBody));
}
} catch (InterruptedException ie) {
LOG.error("Interrupting fence read entry (lid: {}, eid: {})",
new Object[] { ledgerId, entryId, ie });
status = StatusCode.EIO;
} catch (ExecutionException ee) {
LOG.error("Failed to fence read entry (lid: {}, eid: {})",
new Object[] { ledgerId, entryId, ee });
status = StatusCode.EIO;
} catch (TimeoutException te) {
LOG.error("Timeout to fence read entry (lid: {}, eid: {})",
new Object[] { ledgerId, entryId, te });
status = StatusCode.EIO;
}
} else {
readResponse.setBody(ByteString.copyFrom(entryBody));
status = StatusCode.EOK;
}
} catch (Bookie.NoLedgerException e) {
status = StatusCode.ENOLEDGER;
LOG.error("No ledger found while reading entry:{} from ledger: {}", entryId, ledgerId);
} catch (Bookie.NoEntryException e) {
status = StatusCode.ENOENTRY;
if (LOG.isDebugEnabled()) {
LOG.debug("No entry found while reading entry:{} from ledger:{}", entryId, ledgerId);
}
} catch (IOException e) {
status = StatusCode.EIO;
LOG.error("IOException while reading entry:{} from ledger:{}", entryId, ledgerId);
} catch (BookieException e) {
LOG.error("Unauthorized access to ledger:{} while reading entry:{} in request from address: {}",
new Object[]{ledgerId, entryId, channel.getRemoteAddress()});
status = StatusCode.EUA;
}
if (status == StatusCode.EOK) {
requestProcessor.readEntryStats.registerSuccessfulEvent(MathUtils.elapsedNanos(startTimeNanos),
TimeUnit.NANOSECONDS);
} else {
requestProcessor.readEntryStats.registerFailedEvent(MathUtils.elapsedNanos(startTimeNanos),
TimeUnit.NANOSECONDS);
}
// Finally set status and return. The body would have been updated if
// a read went through.
readResponse.setStatus(status);
return readResponse.build();
}
@Override
public void safeRun() {
ReadResponse readResponse = getReadResponse();
sendResponse(readResponse);
}
private void sendResponse(ReadResponse readResponse) {
Response.Builder response = Response.newBuilder()
.setHeader(getHeader())
.setStatus(readResponse.getStatus())
.setReadResponse(readResponse);
sendResponse(response.getStatus(),
response.build(),
requestProcessor.readRequestStats);
}
}