if (commitCallbacks.containsKey(transactionId)) {
throw new IOException("Already committing transaction " + transactionId);
}
}
AbortRequest ar = new AbortRequest();
ar.startTimestamp = transactionId;
ChannelFuture f = channel.write(ar);
f.addListener(new ChannelFutureListener() {
public void operationComplete(ChannelFuture future) {
if (!future.isSuccess()) {