/// <exception cref="System.IO.IOException"/>
public virtual void SeekTFile()
{
int miss = 0;
long totalBytes = 0;
FSDataInputStream fsdis = fs.Open(path);
TFile.Reader reader = new TFile.Reader(fsdis, fs.GetFileStatus(path).GetLen(), conf
);
KeySampler kSampler = new KeySampler(rng, reader.GetFirstKey(), reader.GetLastKey
(), keyLenGen);
TFile.Reader.Scanner scanner = reader.CreateScanner();
BytesWritable key = new BytesWritable();
BytesWritable val = new BytesWritable();
timer.Reset();
timer.Start();
for (int i = 0; i < options.seekCount; ++i)
{
kSampler.Next(key);
scanner.LowerBound(key.Get(), 0, key.GetSize());
if (!scanner.AtEnd())
{
scanner.Entry().Get(key, val);
totalBytes += key.GetSize();
totalBytes += val.GetSize();
}
else
{
++miss;
}
}
timer.Stop();
double duration = (double)timer.Read() / 1000;
// in us.
System.Console.Out.Printf("time: %s...avg seek: %s...%d hit...%d miss...avg I/O size: %.2fKB\n"
, timer.ToString(), NanoTimer.NanoTimeToString(timer.Read() / options.seekCount)
, options.seekCount - miss, miss, (double)totalBytes / 1024 / (options.seekCount
- miss));
}
/// <exception cref="System.IO.IOException"/>
protected override void SetUp()
{
if (options == null)
{
options = new TestTFileSeek.MyOptions(new string[0]);
}
conf = new Configuration();
conf.SetInt("tfile.fs.input.buffer.size", options.fsInputBufferSize);
conf.SetInt("tfile.fs.output.buffer.size", options.fsOutputBufferSize);
path = new Path(new Path(options.rootDir), options.file);
fs = path.GetFileSystem(conf);
timer = new NanoTimer(false);
rng = new Random(options.seed);
keyLenGen = new RandomDistribution.Zipf(new Random(rng.NextLong()), options.minKeyLen
, options.maxKeyLen, 1.2);
RandomDistribution.DiscreteRNG valLenGen = new RandomDistribution.Flat(new Random
(rng.NextLong()), options.minValLength, options.maxValLength);
RandomDistribution.DiscreteRNG wordLenGen = new RandomDistribution.Flat(new Random
(rng.NextLong()), options.minWordLen, options.maxWordLen);
kvGen = new KVGenerator(rng, true, keyLenGen, valLenGen, wordLenGen, options.dictSize
);
}
