void load(File curFile) throws IOException {
checkNotLoaded();
assert curFile != null : "curFile is null";
StartupProgress prog = NameNode.getStartupProgress();
Step step = new Step(StepType.INODES);
prog.beginStep(Phase.LOADING_FSIMAGE, step);
long startTime = now();
//
// Load in bits
//
MessageDigest digester = MD5Hash.getDigester();
DigestInputStream fin = new DigestInputStream(
new FileInputStream(curFile), digester);
DataInputStream in = new DataInputStream(fin);
try {
// read image version: first appeared in version -1
int imgVersion = in.readInt();
if (getLayoutVersion() != imgVersion) {
throw new InconsistentFSStateException(curFile,
"imgVersion " + imgVersion +
" expected to be " + getLayoutVersion());
}
boolean supportSnapshot = LayoutVersion.supports(Feature.SNAPSHOT,
imgVersion);
// read namespaceID: first appeared in version -2
in.readInt();
long numFiles = in.readLong();
// read in the last generation stamp for legacy blocks.
long genstamp = in.readLong();
namesystem.setGenerationStampV1(genstamp);
if (LayoutVersion.supports(Feature.SEQUENTIAL_BLOCK_ID, imgVersion)) {
// read the starting generation stamp for sequential block IDs
genstamp = in.readLong();
namesystem.setGenerationStampV2(genstamp);
// read the last generation stamp for blocks created after
// the switch to sequential block IDs.
long stampAtIdSwitch = in.readLong();
namesystem.setGenerationStampV1Limit(stampAtIdSwitch);
// read the max sequential block ID.
long maxSequentialBlockId = in.readLong();
namesystem.setLastAllocatedBlockId(maxSequentialBlockId);
} else {
long startingGenStamp = namesystem.upgradeGenerationStampToV2();
// This is an upgrade.
LOG.info("Upgrading to sequential block IDs. Generation stamp " +
"for new blocks set to " + startingGenStamp);
}
// read the transaction ID of the last edit represented by
// this image
if (LayoutVersion.supports(Feature.STORED_TXIDS, imgVersion)) {
imgTxId = in.readLong();
} else {
imgTxId = 0;
}
// read the last allocated inode id in the fsimage
if (LayoutVersion.supports(Feature.ADD_INODE_ID, imgVersion)) {
long lastInodeId = in.readLong();
namesystem.resetLastInodeId(lastInodeId);
if (LOG.isDebugEnabled()) {
LOG.debug("load last allocated InodeId from fsimage:" + lastInodeId);
}
} else {
if (LOG.isDebugEnabled()) {
LOG.debug("Old layout version doesn't have inode id."
+ " Will assign new id for each inode.");
}
}
if (supportSnapshot) {
snapshotMap = namesystem.getSnapshotManager().read(in, this);
}
// read compression related info
FSImageCompression compression;
if (LayoutVersion.supports(Feature.FSIMAGE_COMPRESSION, imgVersion)) {
compression = FSImageCompression.readCompressionHeader(conf, in);
} else {
compression = FSImageCompression.createNoopCompression();
}
in = compression.unwrapInputStream(fin);
LOG.info("Loading image file " + curFile + " using " + compression);
// load all inodes
LOG.info("Number of files = " + numFiles);
prog.setTotal(Phase.LOADING_FSIMAGE, step, numFiles);
Counter counter = prog.getCounter(Phase.LOADING_FSIMAGE, step);
if (LayoutVersion.supports(Feature.FSIMAGE_NAME_OPTIMIZATION,
imgVersion)) {
if (supportSnapshot) {
loadLocalNameINodesWithSnapshot(numFiles, in, counter);
} else {
loadLocalNameINodes(numFiles, in, counter);
}
} else {
loadFullNameINodes(numFiles, in, counter);
}
loadFilesUnderConstruction(in, supportSnapshot, counter);
prog.endStep(Phase.LOADING_FSIMAGE, step);
// Now that the step is finished, set counter equal to total to adjust
// for possible under-counting due to reference inodes.
prog.setCount(Phase.LOADING_FSIMAGE, step, numFiles);
loadSecretManagerState(in);
// make sure to read to the end of file
boolean eof = (in.read() == -1);