// Read up to 'len' bytes of Value. Value should already be persisted to // disk. A racing delete can trigger a failure where we get a null return, // but no crash (although one could argue that a racing load&delete is a bug // no matter what). @Override public byte[] load(Value v) { long skip = 0; Key k = v._key; // Convert an arraylet chunk into a long-offset from the base file. if (k._kb[0] == Key.ARRAYLET_CHUNK) { skip = ValueArray.getChunkOffset(k); // The offset k = ValueArray.getArrayKey(k); // From the base file key } if (k._kb[0] == Key.DVEC) { skip = water.fvec.NFSFileVec.chunkOffset(k); // The offset } try { FileInputStream s = null; try { s = new FileInputStream(getFileForKey(k)); FileChannel fc = s.getChannel(); fc.position(skip); AutoBuffer ab = new AutoBuffer(fc, true, Value.NFS); byte[] b = ab.getA1(v._max); ab.close(); assert v.isPersisted(); return b; } finally { if (s != null) s.close(); } } catch (IOException e) { // Broken disk / short-file??? H2O.ignore(e); return null; } }