@Override
protected void flushAndSync(boolean durable) throws IOException {
int numReadyBytes = buf.countReadyBytes();
if (numReadyBytes > 0) {
int numReadyTxns = buf.countReadyTxns();
long firstTxToFlush = buf.getFirstReadyTxId();
assert numReadyTxns > 0;
// Copy from our double-buffer into a new byte array. This is for
// two reasons:
// 1) The IPC code has no way of specifying to send only a slice of
// a larger array.
// 2) because the calls to the underlying nodes are asynchronous, we
// need a defensive copy to avoid accidentally mutating the buffer
// before it is sent.
DataOutputBuffer bufToSend = new DataOutputBuffer(numReadyBytes);
buf.flushTo(bufToSend);
assert bufToSend.getLength() == numReadyBytes;
byte[] data = bufToSend.getData();
assert data.length == bufToSend.getLength();
QuorumCall<AsyncLogger, Void> qcall =
loggers.sendEdits(
segmentTxId, firstTxToFlush,
numReadyTxns, data);
loggers.waitForWriteQuorum(qcall, writeTimeoutMs, "sendEdits");
// Since we successfully wrote this batch, let the loggers know. Any future
// RPCs will thus let the loggers know of the most recent transaction, even
// if a logger has fallen behind.
loggers.setCommittedTxId(firstTxToFlush + numReadyTxns - 1);
}
}
@Override
public void close() throws IOException {
if (buf != null) {
buf.close();
buf = null;
}
}
@Override
public void setReadyToFlush() throws IOException {
buf.setReadyToFlush();
}
@Override
public void writeRaw(byte[] bytes, int offset, int length) throws IOException {
buf.writeRaw(bytes, offset, length);
}
@Override
public void write(FSEditLogOp op) throws IOException {
buf.writeOp(op);
}