* @throws IOException
*/
boolean loadFSImage(FSNamesystem target, MetaRecoveryContext recovery)
throws IOException {
FSImageStorageInspector inspector = storage.readAndInspectDirs();
FSImageFile imageFile = null;
isUpgradeFinalized = inspector.isUpgradeFinalized();
List<FSImageFile> imageFiles = inspector.getLatestImages();
StartupProgress prog = NameNode.getStartupProgress();
prog.beginPhase(Phase.LOADING_FSIMAGE);
File phaseFile = imageFiles.get(0).getFile();
prog.setFile(Phase.LOADING_FSIMAGE, phaseFile.getAbsolutePath());
prog.setSize(Phase.LOADING_FSIMAGE, phaseFile.length());
boolean needToSave = inspector.needToSave();
Iterable<EditLogInputStream> editStreams = null;
initEditLog();
if (LayoutVersion.supports(Feature.TXID_BASED_LAYOUT,
getLayoutVersion())) {
// If we're open for write, we're either non-HA or we're the active NN, so
// we better be able to load all the edits. If we're the standby NN, it's
// OK to not be able to read all of edits right now.
long toAtLeastTxId = editLog.isOpenForWrite() ? inspector.getMaxSeenTxId() : 0;
editStreams = editLog.selectInputStreams(
imageFiles.get(0).getCheckpointTxId() + 1,
toAtLeastTxId, recovery, false);
} else {
editStreams = FSImagePreTransactionalStorageInspector
.getEditLogStreams(storage);
}
int maxOpSize = conf.getInt(DFSConfigKeys.
DFS_NAMENODE_MAX_OP_SIZE_KEY,
DFSConfigKeys.DFS_NAMENODE_MAX_OP_SIZE_DEFAULT);
for (EditLogInputStream elis : editStreams) {
elis.setMaxOpSize(maxOpSize);
}
for (EditLogInputStream l : editStreams) {
LOG.debug("Planning to load edit log stream: " + l);
}
if (!editStreams.iterator().hasNext()) {
LOG.info("No edit log streams selected.");
}
for (int i = 0; i < imageFiles.size(); i++) {
try {
imageFile = imageFiles.get(i);
loadFSImageFile(target, recovery, imageFile);
break;
} catch (IOException ioe) {
LOG.error("Failed to load image from " + imageFile, ioe);
target.clear();
imageFile = null;
}
}
// Failed to load any images, error out
if (imageFile == null) {
FSEditLog.closeAllStreams(editStreams);
throw new IOException("Failed to load an FSImage file!");
}
prog.endPhase(Phase.LOADING_FSIMAGE);
long txnsAdvanced = loadEdits(editStreams, target, recovery);
needToSave |= needsResaveBasedOnStaleCheckpoint(imageFile.getFile(),
txnsAdvanced);
editLog.setNextTxId(lastAppliedTxId + 1);
return needToSave;
}