/**
* Analyze checkpoint directories. Create directories if they do not exist. Recover from an
* unsuccessful checkpoint is necessary.
*
* @param dataDirs
* @param editsDirs
* @throws IOException
*/
void recoverCreate(Collection<File> dataDirs, Collection<File> editsDirs) throws IOException {
Collection<File> tempDataDirs = new ArrayList<File>(dataDirs);
Collection<File> tempEditsDirs = new ArrayList<File>(editsDirs);
this.storageDirs = new ArrayList<StorageDirectory>();
setStorageDirectories(tempDataDirs, tempEditsDirs);
for (Iterator<StorageDirectory> it = dirIterator(); it.hasNext(); ) {
StorageDirectory sd = it.next();
boolean isAccessible = true;
try { // create directories if don't exist yet
if (!sd.getRoot().mkdirs()) {
// do nothing, directory is already created
}
} catch (SecurityException se) {
isAccessible = false;
}
if (!isAccessible)
throw new InconsistentFSStateException(
sd.getRoot(), "cannot access checkpoint directory.");
StorageState curState;
try {
curState = sd.analyzeStorage(HdfsConstants.StartupOption.REGULAR);
// sd is locked but not opened
switch (curState) {
case NON_EXISTENT:
// fail if any of the configured checkpoint dirs are inaccessible
throw new InconsistentFSStateException(
sd.getRoot(), "checkpoint directory does not exist or is not accessible.");
case NOT_FORMATTED:
break; // it's ok since initially there is no current and VERSION
case NORMAL:
break;
default: // recovery is possible
sd.doRecover(curState);
}
} catch (IOException ioe) {
sd.unlock();
throw ioe;
}
}
}
