| /** |
| * 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.BookieProtocol.Request; |
| import org.apache.bookkeeper.util.MathUtils; |
| import org.jboss.netty.channel.Channel; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| class ReadEntryProcessor extends PacketProcessorBase { |
| private final static Logger LOG = LoggerFactory.getLogger(ReadEntryProcessor.class); |
| |
| public ReadEntryProcessor(Request request, Channel channel, |
| BookieRequestProcessor requestProcessor) { |
| super(request, channel, requestProcessor); |
| } |
| |
| @Override |
| protected void processPacket() { |
| assert (request instanceof BookieProtocol.ReadRequest); |
| BookieProtocol.ReadRequest read = (BookieProtocol.ReadRequest) request; |
| |
| LOG.debug("Received new read request: {}", request); |
| int errorCode = BookieProtocol.EIO; |
| long startTimeNanos = MathUtils.nowInNano(); |
| ByteBuffer data = null; |
| try { |
| Future<Boolean> fenceResult = null; |
| if (read.isFencingRequest()) { |
| LOG.warn("Ledger " + request.getLedgerId() + " fenced by " + channel.getRemoteAddress()); |
| |
| if (read.hasMasterKey()) { |
| fenceResult = requestProcessor.bookie.fenceLedger(read.getLedgerId(), read.getMasterKey()); |
| } else { |
| LOG.error("Password not provided, Not safe to fence {}", read.getLedgerId()); |
| throw BookieException.create(BookieException.Code.UnauthorizedAccessException); |
| } |
| } |
| data = requestProcessor.bookie.readEntry(request.getLedgerId(), request.getEntryId()); |
| LOG.debug("##### Read entry ##### {}", data.remaining()); |
| 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. |
| errorCode = BookieProtocol.EIO; |
| data = null; |
| } else { |
| errorCode = BookieProtocol.EOK; |
| } |
| } catch (InterruptedException ie) { |
| LOG.error("Interrupting fence read entry " + read, ie); |
| errorCode = BookieProtocol.EIO; |
| data = null; |
| } catch (ExecutionException ee) { |
| LOG.error("Failed to fence read entry " + read, ee); |
| errorCode = BookieProtocol.EIO; |
| data = null; |
| } catch (TimeoutException te) { |
| LOG.error("Timeout to fence read entry " + read, te); |
| errorCode = BookieProtocol.EIO; |
| data = null; |
| } |
| } else { |
| errorCode = BookieProtocol.EOK; |
| } |
| } catch (Bookie.NoLedgerException e) { |
| if (LOG.isTraceEnabled()) { |
| LOG.error("Error reading " + read, e); |
| } |
| errorCode = BookieProtocol.ENOLEDGER; |
| } catch (Bookie.NoEntryException e) { |
| if (LOG.isTraceEnabled()) { |
| LOG.error("Error reading " + read, e); |
| } |
| errorCode = BookieProtocol.ENOENTRY; |
| } catch (IOException e) { |
| if (LOG.isTraceEnabled()) { |
| LOG.error("Error reading " + read, e); |
| } |
| errorCode = BookieProtocol.EIO; |
| } catch (BookieException e) { |
| LOG.error("Unauthorized access to ledger " + read.getLedgerId(), e); |
| errorCode = BookieProtocol.EUA; |
| } |
| |
| LOG.trace("Read entry rc = {} for {}", |
| new Object[] { errorCode, read }); |
| if (errorCode == BookieProtocol.EOK) { |
| requestProcessor.readEntryStats.registerSuccessfulEvent(MathUtils.elapsedMSec(startTimeNanos)); |
| sendResponse(errorCode, ResponseBuilder.buildReadResponse(data, read), |
| requestProcessor.readRequestStats); |
| |
| } else { |
| requestProcessor.readEntryStats.registerFailedEvent(MathUtils.elapsedMSec(startTimeNanos)); |
| sendResponse(errorCode, ResponseBuilder.buildErrorResponse(errorCode, read), |
| requestProcessor.readRequestStats); |
| } |
| } |
| } |