/** Find the file corresponding to the block and return it if it exists. */
File validateBlockFile(Block b) {
// Should we check for metadata file too?
File f = getFile(b);
if (f != null && f.exists()) return f;
if (InterDatanodeProtocol.LOG.isDebugEnabled()) {
InterDatanodeProtocol.LOG.debug("b=" + b + ", f=" + f);
}
return null;
}
/** Get File name for a given block. */
public synchronized File getBlockFile(Block b) throws IOException {
File f = validateBlockFile(b);
if (f == null) {
if (InterDatanodeProtocol.LOG.isDebugEnabled()) {
InterDatanodeProtocol.LOG.debug("b=" + b + ", volumeMap=" + volumeMap);
}
throw new IOException("Block " + b + " is not valid.");
}
return f;
}