/** * Writes the value and value length for non-first record. * * @param kv Key-value writer. * @return The offset of the new record. */ private long writeValueAndLength(KvSource kv) throws SerDeException { long valueOffset = writeBuffers.getWritePoint(); kv.writeValue(writeBuffers); long tailOffset = writeBuffers.getWritePoint(); writeBuffers.writeVLong(tailOffset - valueOffset); // LOG.info("Writing value at " + valueOffset + " length " + (tailOffset - valueOffset)); return tailOffset; }
/** * Writes first value and lengths to finish the first record after the key has been written. * * @param kv Key-value writer. * @param keyOffset * @param keyLength Key length (already written). * @param hashCode * @return The offset of the new record. */ private long writeFirstValueRecord(KvSource kv, long keyOffset, int keyLength, int hashCode) throws SerDeException { long valueOffset = writeBuffers.getWritePoint(); kv.writeValue(writeBuffers); long tailOffset = writeBuffers.getWritePoint(); int valueLength = (int) (tailOffset - valueOffset); // LOG.info("Writing value at " + valueOffset + " length " + valueLength); // In an unlikely case of 0-length key and value for the very first entry, we want to tell // this apart from an empty value. We'll just advance one byte; this byte will be lost. if (tailOffset == 0) { writeBuffers.reserve(1); ++tailOffset; } // LOG.info("First tail offset " + writeBuffers.getWritePoint()); writeBuffers.writeVLong(valueLength); writeBuffers.writeVLong(keyLength); long lengthsLength = writeBuffers.getWritePoint() - tailOffset; if (lengthsLength < 5) { // Reserve space for potential future list writeBuffers.reserve(5 - (int) lengthsLength); } // Finally write the hash code. writeBuffers.writeInt(keyOffset - 4, hashCode); return tailOffset; }