public virtual void CommonUsagePerfTest()
{
int NumRuns = 5;
DataChecksum checksum = DataChecksum.NewDataChecksum(DataChecksum.Type.Crc32c, 512
);
int dataLength = 512 * 1024 * 1024;
TestDataChecksum.Harness h = new TestDataChecksum.Harness(checksum, dataLength, true
);
for (int i = 0; i < NumRuns; i++)
{
StopWatch s = new StopWatch().Start();
// calculate real checksum, make sure it passes
checksum.CalculateChunkedSums(h.dataBuf, h.checksumBuf);
s.Stop();
System.Console.Error.WriteLine("Calculate run #" + i + ": " + s.Now(TimeUnit.Microseconds
) + "us");
s = new StopWatch().Start();
// calculate real checksum, make sure it passes
checksum.VerifyChunkedSums(h.dataBuf, h.checksumBuf, "fake file", 0);
s.Stop();
System.Console.Error.WriteLine("Verify run #" + i + ": " + s.Now(TimeUnit.Microseconds
) + "us");
}
}
/// <exception cref="Org.Apache.Hadoop.FS.ChecksumException"/>
internal virtual void TestCorrectness()
{
// calculate real checksum, make sure it passes
checksum.CalculateChunkedSums(dataBuf, checksumBuf);
checksum.VerifyChunkedSums(dataBuf, checksumBuf, "fake file", 0);
// Change a byte in the header and in the trailer, make sure
// it doesn't affect checksum result
CorruptBufferOffset(checksumBuf, 0);
checksum.VerifyChunkedSums(dataBuf, checksumBuf, "fake file", 0);
CorruptBufferOffset(dataBuf, 0);
dataBuf.Limit(dataBuf.Limit() + 1);
CorruptBufferOffset(dataBuf, dataLength + DataOffsetInBuffer);
dataBuf.Limit(dataBuf.Limit() - 1);
checksum.VerifyChunkedSums(dataBuf, checksumBuf, "fake file", 0);
// Make sure bad checksums fail - error at beginning of array
CorruptBufferOffset(checksumBuf, SumsOffsetInBuffer);
try
{
checksum.VerifyChunkedSums(dataBuf, checksumBuf, "fake file", 0);
NUnit.Framework.Assert.Fail("Did not throw on bad checksums");
}
catch (ChecksumException ce)
{
Assert.Equal(0, ce.GetPos());
}
// Make sure bad checksums fail - error at end of array
UncorruptBufferOffset(checksumBuf, SumsOffsetInBuffer);
CorruptBufferOffset(checksumBuf, SumsOffsetInBuffer + sumsLength - 1);
try
{
checksum.VerifyChunkedSums(dataBuf, checksumBuf, "fake file", 0);
NUnit.Framework.Assert.Fail("Did not throw on bad checksums");
}
catch (ChecksumException ce)
{
int expectedPos = checksum.GetBytesPerChecksum() * (numSums - 1);
Assert.Equal(expectedPos, ce.GetPos());
Assert.True(ce.Message.Contains("fake file"));
}
}