hadoop BlockChecksumHelper 源码
haddop BlockChecksumHelper 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockChecksumHelper.java
/**
* 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.hadoop.hdfs.server.datanode;
import org.apache.hadoop.util.Preconditions;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.hdfs.DFSUtilClient;
import org.apache.hadoop.hdfs.protocol.BlockChecksumOptions;
import org.apache.hadoop.hdfs.protocol.BlockChecksumType;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
import org.apache.hadoop.hdfs.protocol.StripedBlockInfo;
import org.apache.hadoop.hdfs.protocol.datatransfer.DataTransferProtoUtil;
import org.apache.hadoop.hdfs.protocol.datatransfer.IOStreamPair;
import org.apache.hadoop.hdfs.protocol.datatransfer.Op;
import org.apache.hadoop.hdfs.protocol.datatransfer.Sender;
import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos;
import org.apache.hadoop.hdfs.protocolPB.PBHelperClient;
import org.apache.hadoop.hdfs.security.token.block.BlockTokenIdentifier;
import org.apache.hadoop.hdfs.server.datanode.erasurecode.StripedBlockChecksumCompositeCrcReconstructor;
import org.apache.hadoop.hdfs.server.datanode.erasurecode.StripedBlockChecksumMd5CrcReconstructor;
import org.apache.hadoop.hdfs.server.datanode.erasurecode.StripedBlockChecksumReconstructor;
import org.apache.hadoop.hdfs.server.datanode.erasurecode.StripedReconstructionInfo;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.LengthInputStream;
import org.apache.hadoop.hdfs.util.StripedBlockUtil;
import org.apache.hadoop.io.DataOutputBuffer;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.io.MD5Hash;
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.util.CrcComposer;
import org.apache.hadoop.util.CrcUtil;
import org.apache.hadoop.util.DataChecksum;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.MessageDigest;
import java.util.HashMap;
import java.util.Map;
/**
* Utilities for Block checksum computing, for both replicated and striped
* blocks.
*/
@InterfaceAudience.Private
final class BlockChecksumHelper {
static final Logger LOG = LoggerFactory.getLogger(BlockChecksumHelper.class);
private BlockChecksumHelper() {
}
/**
* The abstract block checksum computer.
*/
static abstract class AbstractBlockChecksumComputer {
private final DataNode datanode;
private final BlockChecksumOptions blockChecksumOptions;
private byte[] outBytes;
private int bytesPerCRC = -1;
private DataChecksum.Type crcType = null;
private long crcPerBlock = -1;
private int checksumSize = -1;
AbstractBlockChecksumComputer(
DataNode datanode,
BlockChecksumOptions blockChecksumOptions) throws IOException {
this.datanode = datanode;
this.blockChecksumOptions = blockChecksumOptions;
}
abstract void compute() throws IOException;
Sender createSender(IOStreamPair pair) {
DataOutputStream out = (DataOutputStream) pair.out;
return new Sender(out);
}
DataNode getDatanode() {
return datanode;
}
BlockChecksumOptions getBlockChecksumOptions() {
return blockChecksumOptions;
}
InputStream getBlockInputStream(ExtendedBlock block, long seekOffset)
throws IOException {
return datanode.data.getBlockInputStream(block, seekOffset);
}
void setOutBytes(byte[] bytes) {
this.outBytes = bytes;
}
byte[] getOutBytes() {
return outBytes;
}
int getBytesPerCRC() {
return bytesPerCRC;
}
public void setBytesPerCRC(int bytesPerCRC) {
this.bytesPerCRC = bytesPerCRC;
}
public void setCrcType(DataChecksum.Type crcType) {
this.crcType = crcType;
}
public void setCrcPerBlock(long crcPerBlock) {
this.crcPerBlock = crcPerBlock;
}
public void setChecksumSize(int checksumSize) {
this.checksumSize = checksumSize;
}
DataChecksum.Type getCrcType() {
return crcType;
}
long getCrcPerBlock() {
return crcPerBlock;
}
int getChecksumSize() {
return checksumSize;
}
}
/**
* The abstract base block checksum computer, mainly for replicated blocks.
*/
static abstract class BlockChecksumComputer
extends AbstractBlockChecksumComputer {
private final ExtendedBlock block;
// client side now can specify a range of the block for checksum
private final long requestLength;
private final LengthInputStream metadataIn;
private final DataInputStream checksumIn;
private final long visibleLength;
private final boolean partialBlk;
private BlockMetadataHeader header;
private DataChecksum checksum;
BlockChecksumComputer(DataNode datanode,
ExtendedBlock block,
BlockChecksumOptions blockChecksumOptions)
throws IOException {
super(datanode, blockChecksumOptions);
this.block = block;
this.requestLength = block.getNumBytes();
Preconditions.checkArgument(requestLength >= 0);
this.metadataIn = datanode.data.getMetaDataInputStream(block);
this.visibleLength = datanode.data.getReplicaVisibleLength(block);
this.partialBlk = requestLength < visibleLength;
int ioFileBufferSize =
DFSUtilClient.getIoFileBufferSize(datanode.getConf());
this.checksumIn = new DataInputStream(
new BufferedInputStream(metadataIn, ioFileBufferSize));
}
Sender createSender(IOStreamPair pair) {
DataOutputStream out = (DataOutputStream) pair.out;
return new Sender(out);
}
ExtendedBlock getBlock() {
return block;
}
long getRequestLength() {
return requestLength;
}
LengthInputStream getMetadataIn() {
return metadataIn;
}
DataInputStream getChecksumIn() {
return checksumIn;
}
long getVisibleLength() {
return visibleLength;
}
boolean isPartialBlk() {
return partialBlk;
}
BlockMetadataHeader getHeader() {
return header;
}
DataChecksum getChecksum() {
return checksum;
}
/**
* Perform the block checksum computing.
*
* @throws IOException
*/
abstract void compute() throws IOException;
/**
* Read block metadata header.
*
* @throws IOException
*/
void readHeader() throws IOException {
//read metadata file
header = BlockMetadataHeader.readHeader(checksumIn);
checksum = header.getChecksum();
setChecksumSize(checksum.getChecksumSize());
setBytesPerCRC(checksum.getBytesPerChecksum());
long crcPerBlock = checksum.getChecksumSize() <= 0 ? 0 :
(metadataIn.getLength() -
BlockMetadataHeader.getHeaderSize()) / checksum.getChecksumSize();
setCrcPerBlock(crcPerBlock);
setCrcType(checksum.getChecksumType());
}
/**
* Calculate partial block checksum.
*
* @return
* @throws IOException
*/
byte[] crcPartialBlock() throws IOException {
int partialLength = (int) (requestLength % getBytesPerCRC());
if (partialLength > 0) {
byte[] buf = new byte[partialLength];
final InputStream blockIn = getBlockInputStream(block,
requestLength - partialLength);
try {
// Get the CRC of the partialLength.
IOUtils.readFully(blockIn, buf, 0, partialLength);
} finally {
IOUtils.closeStream(blockIn);
}
checksum.update(buf, 0, partialLength);
byte[] partialCrc = new byte[getChecksumSize()];
checksum.writeValue(partialCrc, 0, true);
return partialCrc;
}
return null;
}
}
/**
* Replicated block checksum computer.
*/
static class ReplicatedBlockChecksumComputer extends BlockChecksumComputer {
ReplicatedBlockChecksumComputer(DataNode datanode,
ExtendedBlock block,
BlockChecksumOptions blockChecksumOptions)
throws IOException {
super(datanode, block, blockChecksumOptions);
}
@Override
void compute() throws IOException {
try {
readHeader();
BlockChecksumType type =
getBlockChecksumOptions().getBlockChecksumType();
switch (type) {
case MD5CRC:
computeMd5Crc();
break;
case COMPOSITE_CRC:
computeCompositeCrc(getBlockChecksumOptions().getStripeLength());
break;
default:
throw new IOException(String.format(
"Unrecognized BlockChecksumType: %s", type));
}
} finally {
IOUtils.closeStream(getChecksumIn());
IOUtils.closeStream(getMetadataIn());
}
}
private void computeMd5Crc() throws IOException {
MD5Hash md5out;
if (isPartialBlk() && getCrcPerBlock() > 0) {
md5out = checksumPartialBlock();
} else {
md5out = checksumWholeBlock();
}
setOutBytes(md5out.getDigest());
LOG.debug("block={}, bytesPerCRC={}, crcPerBlock={}, md5out={}",
getBlock(), getBytesPerCRC(), getCrcPerBlock(), md5out);
}
private MD5Hash checksumWholeBlock() throws IOException {
MD5Hash md5out = MD5Hash.digest(getChecksumIn());
return md5out;
}
private MD5Hash checksumPartialBlock() throws IOException {
byte[] buffer = new byte[4 * 1024];
MessageDigest digester = MD5Hash.getDigester();
long remaining = (getRequestLength() / getBytesPerCRC())
* getChecksumSize();
for (int toDigest = 0; remaining > 0; remaining -= toDigest) {
toDigest = getChecksumIn().read(buffer, 0,
(int) Math.min(remaining, buffer.length));
if (toDigest < 0) {
break;
}
digester.update(buffer, 0, toDigest);
}
byte[] partialCrc = crcPartialBlock();
if (partialCrc != null) {
digester.update(partialCrc);
}
return new MD5Hash(digester.digest());
}
private void computeCompositeCrc(long stripeLength) throws IOException {
long checksumDataLength =
Math.min(getVisibleLength(), getRequestLength());
if (stripeLength <= 0 || stripeLength > checksumDataLength) {
stripeLength = checksumDataLength;
}
CrcComposer crcComposer = CrcComposer.newStripedCrcComposer(
getCrcType(), getBytesPerCRC(), stripeLength);
DataInputStream checksumIn = getChecksumIn();
// Whether getting the checksum for the entire block (which itself may
// not be a full block size and may have a final chunk smaller than
// getBytesPerCRC()), we begin with a number of full chunks, all of size
// getBytesPerCRC().
long numFullChunks = checksumDataLength / getBytesPerCRC();
crcComposer.update(checksumIn, numFullChunks, getBytesPerCRC());
// There may be a final partial chunk that is not full-sized. Unlike the
// MD5 case, we still consider this a "partial chunk" even if
// getRequestLength() == getVisibleLength(), since the CRC composition
// depends on the byte size of that final chunk, even if it already has a
// precomputed CRC stored in metadata. So there are two cases:
// 1. Reading only part of a block via getRequestLength(); we get the
// crcPartialBlock() explicitly.
// 2. Reading full visible length; the partial chunk already has a CRC
// stored in block metadata, so we just continue reading checksumIn.
long partialChunkSize = checksumDataLength % getBytesPerCRC();
if (partialChunkSize > 0) {
if (isPartialBlk()) {
byte[] partialChunkCrcBytes = crcPartialBlock();
crcComposer.update(
partialChunkCrcBytes, 0, partialChunkCrcBytes.length,
partialChunkSize);
} else {
int partialChunkCrc = checksumIn.readInt();
crcComposer.update(partialChunkCrc, partialChunkSize);
}
}
byte[] composedCrcs = crcComposer.digest();
setOutBytes(composedCrcs);
if (LOG.isDebugEnabled()) {
LOG.debug(
"block={}, getBytesPerCRC={}, crcPerBlock={}, compositeCrc={}",
getBlock(), getBytesPerCRC(), getCrcPerBlock(),
CrcUtil.toMultiCrcString(composedCrcs));
}
}
}
/**
* Non-striped block group checksum computer for striped blocks.
*/
static class BlockGroupNonStripedChecksumComputer
extends AbstractBlockChecksumComputer {
private final ExtendedBlock blockGroup;
private final ErasureCodingPolicy ecPolicy;
private final DatanodeInfo[] datanodes;
private final Token<BlockTokenIdentifier>[] blockTokens;
private final byte[] blockIndices;
private final long requestedNumBytes;
private final DataOutputBuffer blockChecksumBuf = new DataOutputBuffer();
// Keeps track of the positions within blockChecksumBuf where each data
// block's checksum begins; for fixed-size block checksums this is easily
// calculated as a multiple of the checksum size, but for striped block
// CRCs, it's less error-prone to simply keep track of exact byte offsets
// before each block checksum is populated into the buffer.
private final int[] blockChecksumPositions;
BlockGroupNonStripedChecksumComputer(
DataNode datanode,
StripedBlockInfo stripedBlockInfo,
long requestedNumBytes,
BlockChecksumOptions blockChecksumOptions)
throws IOException {
super(datanode, blockChecksumOptions);
this.blockGroup = stripedBlockInfo.getBlock();
this.ecPolicy = stripedBlockInfo.getErasureCodingPolicy();
this.datanodes = stripedBlockInfo.getDatanodes();
this.blockTokens = stripedBlockInfo.getBlockTokens();
this.blockIndices = stripedBlockInfo.getBlockIndices();
this.requestedNumBytes = requestedNumBytes;
this.blockChecksumPositions = new int[this.ecPolicy.getNumDataUnits()];
}
private static class LiveBlockInfo {
private final DatanodeInfo dn;
private final Token<BlockTokenIdentifier> token;
LiveBlockInfo(DatanodeInfo dn, Token<BlockTokenIdentifier> token) {
this.dn = dn;
this.token = token;
}
DatanodeInfo getDn() {
return dn;
}
Token<BlockTokenIdentifier> getToken() {
return token;
}
}
@Override
void compute() throws IOException {
assert datanodes.length == blockIndices.length;
Map<Byte, LiveBlockInfo> liveDns = new HashMap<>(datanodes.length);
int blkIndxLen = blockIndices.length;
int numDataUnits = ecPolicy.getNumDataUnits();
// Prepare live datanode list. Missing data blocks will be reconstructed
// and recalculate checksum.
for (int idx = 0; idx < blkIndxLen; idx++) {
liveDns.put(blockIndices[idx],
new LiveBlockInfo(datanodes[idx], blockTokens[idx]));
}
long checksumLen = 0;
for (int idx = 0; idx < numDataUnits && idx < blkIndxLen; idx++) {
// Before populating the blockChecksum at this index, record the byte
// offset where it will begin.
blockChecksumPositions[idx] = blockChecksumBuf.getLength();
ExtendedBlock block = null;
try {
block = getInternalBlock(numDataUnits, idx);
LiveBlockInfo liveBlkInfo = liveDns.get((byte) idx);
if (liveBlkInfo == null) {
// reconstruct block and calculate checksum for missing node
recalculateChecksum(idx, block.getNumBytes());
} else {
try {
checksumBlock(block, idx, liveBlkInfo.getToken(),
liveBlkInfo.getDn());
} catch (IOException ioe) {
LOG.warn("Exception while reading checksum", ioe);
// reconstruct block and calculate checksum for the failed node
recalculateChecksum(idx, block.getNumBytes());
}
}
checksumLen += block.getNumBytes();
if (checksumLen >= requestedNumBytes) {
break; // done with the computation, simply return.
}
} catch (IOException e) {
LOG.warn("Failed to get the checksum for block {} at index {} "
+ "in blockGroup {}", block, idx, blockGroup, e);
throw e;
}
}
BlockChecksumType type = getBlockChecksumOptions().getBlockChecksumType();
switch (type) {
case MD5CRC:
MD5Hash md5out = MD5Hash.digest(blockChecksumBuf.getData());
setOutBytes(md5out.getDigest());
break;
case COMPOSITE_CRC:
byte[] digest = reassembleNonStripedCompositeCrc(checksumLen);
setOutBytes(digest);
break;
default:
throw new IOException(String.format(
"Unrecognized BlockChecksumType: %s", type));
}
}
/**
* @param checksumLen The sum of bytes associated with the block checksum
* data being digested into a block-group level checksum.
*/
private byte[] reassembleNonStripedCompositeCrc(long checksumLen)
throws IOException {
int numDataUnits = ecPolicy.getNumDataUnits();
CrcComposer crcComposer = CrcComposer.newCrcComposer(
getCrcType(), ecPolicy.getCellSize());
// This should hold all the cell-granularity checksums of blk0
// followed by all cell checksums of blk1, etc. We must unstripe the
// cell checksums in order of logical file bytes. Also, note that the
// length of this array may not equal the the number of actually valid
// bytes in the buffer (blockChecksumBuf.getLength()).
byte[] flatBlockChecksumData = blockChecksumBuf.getData();
// Initialize byte-level cursors to where each block's checksum begins
// inside the combined flattened buffer.
int[] blockChecksumCursors = new int[numDataUnits];
for (int idx = 0; idx < numDataUnits; ++idx) {
blockChecksumCursors[idx] = blockChecksumPositions[idx];
}
// Reassemble cell-level CRCs in the right order.
long numFullCells = checksumLen / ecPolicy.getCellSize();
for (long cellIndex = 0; cellIndex < numFullCells; ++cellIndex) {
int blockIndex = (int) (cellIndex % numDataUnits);
int checksumCursor = blockChecksumCursors[blockIndex];
int cellCrc = CrcUtil.readInt(
flatBlockChecksumData, checksumCursor);
blockChecksumCursors[blockIndex] += 4;
crcComposer.update(cellCrc, ecPolicy.getCellSize());
}
if (checksumLen % ecPolicy.getCellSize() != 0) {
// Final partial cell.
int blockIndex = (int) (numFullCells % numDataUnits);
int checksumCursor = blockChecksumCursors[blockIndex];
int cellCrc = CrcUtil.readInt(
flatBlockChecksumData, checksumCursor);
blockChecksumCursors[blockIndex] += 4;
crcComposer.update(cellCrc, checksumLen % ecPolicy.getCellSize());
}
byte[] digest = crcComposer.digest();
if (LOG.isDebugEnabled()) {
LOG.debug("flatBlockChecksumData.length={}, numDataUnits={}, "
+ "checksumLen={}, digest={}",
flatBlockChecksumData.length,
numDataUnits,
checksumLen,
CrcUtil.toSingleCrcString(digest));
}
return digest;
}
private ExtendedBlock getInternalBlock(int numDataUnits, int idx) {
// Sets requested number of bytes in blockGroup which is required to
// construct the internal block for computing checksum.
long actualNumBytes = blockGroup.getNumBytes();
blockGroup.setNumBytes(requestedNumBytes);
ExtendedBlock block = StripedBlockUtil.constructInternalBlock(blockGroup,
ecPolicy.getCellSize(), numDataUnits, idx);
// Set back actualNumBytes value in blockGroup.
blockGroup.setNumBytes(actualNumBytes);
return block;
}
private void checksumBlock(ExtendedBlock block, int blockIdx,
Token<BlockTokenIdentifier> blockToken,
DatanodeInfo targetDatanode) throws IOException {
int timeout = getDatanode().getDnConf().getEcChecksumSocketTimeout();
try (IOStreamPair pair = getDatanode().connectToDN(targetDatanode,
timeout, block, blockToken)) {
LOG.debug("write to {}: {}, block={}",
getDatanode(), Op.BLOCK_CHECKSUM, block);
// get block checksum
// A BlockGroupCheckum of type COMPOSITE_CRC uses underlying
// BlockChecksums also of type COMPOSITE_CRC but with
// stripeLength == ecPolicy.getCellSize().
BlockChecksumOptions childOptions;
BlockChecksumType groupChecksumType =
getBlockChecksumOptions().getBlockChecksumType();
switch (groupChecksumType) {
case MD5CRC:
childOptions = getBlockChecksumOptions();
break;
case COMPOSITE_CRC:
childOptions = new BlockChecksumOptions(
BlockChecksumType.COMPOSITE_CRC, ecPolicy.getCellSize());
break;
default:
throw new IOException(
"Unknown BlockChecksumType: " + groupChecksumType);
}
createSender(pair).blockChecksum(block, blockToken, childOptions);
final DataTransferProtos.BlockOpResponseProto reply =
DataTransferProtos.BlockOpResponseProto.parseFrom(
PBHelperClient.vintPrefixed(pair.in));
String logInfo = "for block " + block
+ " from datanode " + targetDatanode;
DataTransferProtoUtil.checkBlockOpStatus(reply, logInfo);
DataTransferProtos.OpBlockChecksumResponseProto checksumData =
reply.getChecksumResponse();
// read crc-type
final DataChecksum.Type ct;
if (checksumData.hasCrcType()) {
ct = PBHelperClient.convert(checksumData.getCrcType());
} else {
LOG.debug("Retrieving checksum from an earlier-version DataNode: "
+ "inferring checksum by reading first byte");
ct = DataChecksum.Type.DEFAULT;
}
setOrVerifyChecksumProperties(blockIdx, checksumData.getBytesPerCrc(),
checksumData.getCrcPerBlock(), ct);
switch (groupChecksumType) {
case MD5CRC:
//read md5
final MD5Hash md5 =
new MD5Hash(checksumData.getBlockChecksum().toByteArray());
md5.write(blockChecksumBuf);
LOG.debug("got reply from datanode:{}, md5={}",
targetDatanode, md5);
break;
case COMPOSITE_CRC:
BlockChecksumType returnedType = PBHelperClient.convert(
checksumData.getBlockChecksumOptions().getBlockChecksumType());
if (returnedType != BlockChecksumType.COMPOSITE_CRC) {
throw new IOException(String.format(
"Unexpected blockChecksumType '%s', expecting COMPOSITE_CRC",
returnedType));
}
byte[] checksumBytes =
checksumData.getBlockChecksum().toByteArray();
blockChecksumBuf.write(checksumBytes, 0, checksumBytes.length);
if (LOG.isDebugEnabled()) {
LOG.debug("got reply from datanode:{} for blockIdx:{}, checksum:{}",
targetDatanode, blockIdx,
CrcUtil.toMultiCrcString(checksumBytes));
}
break;
default:
throw new IOException(
"Unknown BlockChecksumType: " + groupChecksumType);
}
}
}
/**
* Reconstruct this data block and recalculate checksum.
*
* @param errBlkIndex
* error index to be reconstructed and recalculate checksum.
* @param blockLength
* number of bytes in the block to compute checksum.
* @throws IOException
*/
private void recalculateChecksum(int errBlkIndex, long blockLength)
throws IOException {
LOG.debug("Recalculate checksum for the missing/failed block index {}",
errBlkIndex);
byte[] errIndices = new byte[1];
errIndices[0] = (byte) errBlkIndex;
StripedReconstructionInfo stripedReconInfo =
new StripedReconstructionInfo(
blockGroup, ecPolicy, blockIndices, datanodes, errIndices);
BlockChecksumType groupChecksumType =
getBlockChecksumOptions().getBlockChecksumType();
try (StripedBlockChecksumReconstructor checksumRecon =
groupChecksumType == BlockChecksumType.COMPOSITE_CRC ?
new StripedBlockChecksumCompositeCrcReconstructor(
getDatanode().getErasureCodingWorker(), stripedReconInfo,
blockChecksumBuf, blockLength) :
new StripedBlockChecksumMd5CrcReconstructor(
getDatanode().getErasureCodingWorker(), stripedReconInfo,
blockChecksumBuf, blockLength)) {
checksumRecon.reconstruct();
DataChecksum checksum = checksumRecon.getChecksum();
long crcPerBlock = checksum.getChecksumSize() <= 0 ? 0
: checksumRecon.getChecksumDataLen() / checksum.getChecksumSize();
setOrVerifyChecksumProperties(errBlkIndex,
checksum.getBytesPerChecksum(), crcPerBlock,
checksum.getChecksumType());
LOG.debug("Recalculated checksum for the block index:{}, checksum={}",
errBlkIndex, checksumRecon.getDigestObject());
}
}
private void setOrVerifyChecksumProperties(int blockIdx, int bpc,
final long cpb, DataChecksum.Type ct) throws IOException {
//read byte-per-checksum
if (blockIdx == 0) { //first block
setBytesPerCRC(bpc);
} else if (bpc != getBytesPerCRC()) {
throw new IOException("Byte-per-checksum not matched: bpc=" + bpc
+ " but bytesPerCRC=" + getBytesPerCRC());
}
//read crc-per-block
if (blockIdx == 0) {
setCrcPerBlock(cpb);
}
if (blockIdx == 0) { // first block
setCrcType(ct);
} else if (getCrcType() != DataChecksum.Type.MIXED &&
getCrcType() != ct) {
BlockChecksumType groupChecksumType =
getBlockChecksumOptions().getBlockChecksumType();
if (groupChecksumType == BlockChecksumType.COMPOSITE_CRC) {
throw new IOException(String.format(
"BlockChecksumType COMPOSITE_CRC doesn't support MIXED "
+ "underlying types; previous block was %s, next block is %s",
getCrcType(), ct));
} else {
setCrcType(DataChecksum.Type.MIXED);
}
}
if (blockIdx == 0) {
LOG.debug("set bytesPerCRC={}, crcPerBlock={}", getBytesPerCRC(),
getCrcPerBlock());
}
}
}
}
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