List of usage examples for org.apache.lucene.codecs CodecUtil CODEC_MAGIC
int CODEC_MAGIC
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From source file:org.apache.blur.mapreduce.lib.GenericRecordReader.java
License:Apache License
private SegmentInfoPerCommit segmentInfosRead(Directory directory, String segmentFileName, String segmentInfoName) throws IOException { boolean success = false; ChecksumIndexInput input = new ChecksumIndexInput(directory.openInput(segmentFileName, IOContext.READ)); try {/*from w ww . ja v a2s . c om*/ final int format = input.readInt(); if (format == CodecUtil.CODEC_MAGIC) { // 4.0+ CodecUtil.checkHeaderNoMagic(input, "segments", SegmentInfos.VERSION_40, SegmentInfos.VERSION_40); input.readLong();// read version input.readInt(); // read counter int numSegments = input.readInt(); if (numSegments < 0) { throw new CorruptIndexException( "invalid segment count: " + numSegments + " (resource: " + input + ")"); } for (int seg = 0; seg < numSegments; seg++) { String segName = input.readString(); Codec codec = Codec.forName(input.readString()); SegmentInfo info = codec.segmentInfoFormat().getSegmentInfoReader().read(directory, segName, IOContext.READ); info.setCodec(codec); long delGen = input.readLong(); int delCount = input.readInt(); if (delCount < 0 || delCount > info.getDocCount()) { throw new CorruptIndexException( "invalid deletion count: " + delCount + " (resource: " + input + ")"); } if (segName.equals(segmentInfoName)) { success = true; return new SegmentInfoPerCommit(info, delCount, delGen); } } } else { throw new IOException("Legacy Infos not supported for dir [" + directory + "]."); } throw new IOException("Segment [" + segmentInfoName + "] nout found in dir [" + directory + "]"); } finally { if (!success) { IOUtils.closeWhileHandlingException(input); } else { input.close(); } } }
From source file:org.elasticsearch.index.translog.TranslogReader.java
License:Apache License
/** * Given a file, return a VersionedTranslogStream based on an * optionally-existing header in the file. If the file does not exist, or * has zero length, returns the latest version. If the header does not * exist, assumes Version 0 of the translog file format. * <p/>/*from w w w.ja va 2 s . c om*/ * * @throws IOException */ public static ImmutableTranslogReader open(ChannelReference channelReference, Checkpoint checkpoint, String translogUUID) throws IOException { final FileChannel channel = channelReference.getChannel(); final Path path = channelReference.getPath(); assert channelReference.getGeneration() == checkpoint.generation : "expected generation: " + channelReference.getGeneration() + " but got: " + checkpoint.generation; try { if (checkpoint.offset == 0 && checkpoint.numOps == TranslogReader.UNKNOWN_OP_COUNT) { // only old files can be empty return new LegacyTranslogReader(channelReference.getGeneration(), channelReference, 0); } InputStreamStreamInput headerStream = new InputStreamStreamInput(Channels.newInputStream(channel)); // don't close // Lucene's CodecUtil writes a magic number of 0x3FD76C17 with the // header, in binary this looks like: // // binary: 0011 1111 1101 0111 0110 1100 0001 0111 // hex : 3 f d 7 6 c 1 7 // // With version 0 of the translog, the first byte is the // Operation.Type, which will always be between 0-4, so we know if // we grab the first byte, it can be: // 0x3f => Lucene's magic number, so we can assume it's version 1 or later // 0x00 => version 0 of the translog // // otherwise the first byte of the translog is corrupted and we // should bail byte b1 = headerStream.readByte(); if (b1 == LUCENE_CODEC_HEADER_BYTE) { // Read 3 more bytes, meaning a whole integer has been read byte b2 = headerStream.readByte(); byte b3 = headerStream.readByte(); byte b4 = headerStream.readByte(); // Convert the 4 bytes that were read into an integer int header = ((b1 & 0xFF) << 24) + ((b2 & 0xFF) << 16) + ((b3 & 0xFF) << 8) + ((b4 & 0xFF) << 0); // We confirm CodecUtil's CODEC_MAGIC number (0x3FD76C17) // ourselves here, because it allows us to read the first // byte separately if (header != CodecUtil.CODEC_MAGIC) { throw new TranslogCorruptedException( "translog looks like version 1 or later, but has corrupted header"); } // Confirm the rest of the header using CodecUtil, extracting // the translog version int version = CodecUtil.checkHeaderNoMagic(new InputStreamDataInput(headerStream), TranslogWriter.TRANSLOG_CODEC, 1, Integer.MAX_VALUE); switch (version) { case TranslogWriter.VERSION_CHECKSUMS: assert checkpoint.numOps == TranslogReader.UNKNOWN_OP_COUNT : "expected unknown op count but got: " + checkpoint.numOps; assert checkpoint.offset == Files.size(path) : "offset(" + checkpoint.offset + ") != file_size(" + Files.size(path) + ") for: " + path; // legacy - we still have to support it somehow return new LegacyTranslogReaderBase(channelReference.getGeneration(), channelReference, CodecUtil.headerLength(TranslogWriter.TRANSLOG_CODEC), checkpoint.offset); case TranslogWriter.VERSION_CHECKPOINTS: assert path.getFileName().toString() .endsWith(Translog.TRANSLOG_FILE_SUFFIX) : "new file ends with old suffix: " + path; assert checkpoint.numOps > TranslogReader.UNKNOWN_OP_COUNT : "expected at least 0 operatin but got: " + checkpoint.numOps; assert checkpoint.offset <= channel.size() : "checkpoint is inconsistent with channel length: " + channel.size() + " " + checkpoint; int len = headerStream.readInt(); if (len > channel.size()) { throw new TranslogCorruptedException("uuid length can't be larger than the translog"); } BytesRef ref = new BytesRef(len); ref.length = len; headerStream.read(ref.bytes, ref.offset, ref.length); BytesRef uuidBytes = new BytesRef(translogUUID); if (uuidBytes.bytesEquals(ref) == false) { throw new TranslogCorruptedException("expected shard UUID [" + uuidBytes + "] but got: [" + ref + "] this translog file belongs to a different translog"); } return new ImmutableTranslogReader(channelReference.getGeneration(), channelReference, ref.length + CodecUtil.headerLength(TranslogWriter.TRANSLOG_CODEC) + RamUsageEstimator.NUM_BYTES_INT, checkpoint.offset, checkpoint.numOps); default: throw new TranslogCorruptedException( "No known translog stream version: " + version + " path:" + path); } } else if (b1 == UNVERSIONED_TRANSLOG_HEADER_BYTE) { assert checkpoint.numOps == TranslogReader.UNKNOWN_OP_COUNT : "expected unknown op count but got: " + checkpoint.numOps; assert checkpoint.offset == Files.size(path) : "offset(" + checkpoint.offset + ") != file_size(" + Files.size(path) + ") for: " + path; return new LegacyTranslogReader(channelReference.getGeneration(), channelReference, checkpoint.offset); } else { throw new TranslogCorruptedException("Invalid first byte in translog file, got: " + Long.toHexString(b1) + ", expected 0x00 or 0x3f"); } } catch (CorruptIndexException | IndexFormatTooOldException | IndexFormatTooNewException e) { throw new TranslogCorruptedException("Translog header corrupted", e); } }
From source file:org.elasticsearch.index.translog.TranslogStreams.java
License:Apache License
/** * Given a file, return a VersionedTranslogStream based on an * optionally-existing header in the file. If the file does not exist, or * has zero length, returns the latest version. If the header does not * exist, assumes Version 0 of the translog file format. * <p/>/*from ww w . j a va2 s. co m*/ * The caller is responsible for closing the TranslogStream. * * @throws IOException */ public static TranslogStream translogStreamFor(File translogFile) throws IOException { try (InputStreamStreamInput headerStream = new InputStreamStreamInput(new FileInputStream(translogFile));) { if (translogFile.exists() == false || translogFile.length() == 0) { // if it doesn't exist or has no data, use the latest version, // there aren't any backwards compatibility issues return CHECKSUMMED_TRANSLOG_STREAM; } // Lucene's CodecUtil writes a magic number of 0x3FD76C17 with the // header, in binary this looks like: // // binary: 0011 1111 1101 0111 0110 1100 0001 0111 // hex : 3 f d 7 6 c 1 7 // // With version 0 of the translog, the first byte is the // Operation.Type, which will always be between 0-4, so we know if // we grab the first byte, it can be: // 0x3f => Lucene's magic number, so we can assume it's version 1 or later // 0x00 => version 0 of the translog // // otherwise the first byte of the translog is corrupted and we // should bail byte b1 = headerStream.readByte(); if (b1 == LUCENE_CODEC_HEADER_BYTE) { // Read 3 more bytes, meaning a whole integer has been read byte b2 = headerStream.readByte(); byte b3 = headerStream.readByte(); byte b4 = headerStream.readByte(); // Convert the 4 bytes that were read into an integer int header = ((b1 & 0xFF) << 24) + ((b2 & 0xFF) << 16) + ((b3 & 0xFF) << 8) + ((b4 & 0xFF) << 0); // We confirm CodecUtil's CODEC_MAGIC number (0x3FD76C17) // ourselves here, because it allows us to read the first // byte separately if (header != CodecUtil.CODEC_MAGIC) { throw new TranslogCorruptedException( "translog looks like version 1 or later, but has corrupted header"); } // Confirm the rest of the header using CodecUtil, extracting // the translog version int version = CodecUtil.checkHeaderNoMagic(new InputStreamDataInput(headerStream), TRANSLOG_CODEC, 1, Integer.MAX_VALUE); switch (version) { case ChecksummedTranslogStream.VERSION: return CHECKSUMMED_TRANSLOG_STREAM; default: throw new TranslogCorruptedException("No known translog stream version: " + version); } } else if (b1 == UNVERSIONED_TRANSLOG_HEADER_BYTE) { return LEGACY_TRANSLOG_STREAM; } else { throw new TranslogCorruptedException("Invalid first byte in translog file, got: " + Long.toHexString(b1) + ", expected 0x00 or 0x3f"); } } catch (CorruptIndexException e) { throw new TranslogCorruptedException("Translog header corrupted", e); } }