public virtual void TestGzipCompatibility()
{
Random r = new Random();
long seed = r.NextLong();
r.SetSeed(seed);
Log.Info("seed: " + seed);
DataOutputBuffer dflbuf = new DataOutputBuffer();
GZIPOutputStream gzout = new GZIPOutputStream(dflbuf);
byte[] b = new byte[r.Next(128 * 1024 + 1)];
r.NextBytes(b);
gzout.Write(b);
gzout.Close();
DataInputBuffer gzbuf = new DataInputBuffer();
gzbuf.Reset(dflbuf.GetData(), dflbuf.GetLength());
Configuration conf = new Configuration();
conf.SetBoolean(CommonConfigurationKeys.IoNativeLibAvailableKey, false);
CompressionCodec codec = ReflectionUtils.NewInstance <GzipCodec>(conf);
Decompressor decom = codec.CreateDecompressor();
NUnit.Framework.Assert.IsNotNull(decom);
Assert.Equal(typeof(BuiltInGzipDecompressor), decom.GetType());
InputStream gzin = codec.CreateInputStream(gzbuf, decom);
dflbuf.Reset();
IOUtils.CopyBytes(gzin, dflbuf, 4096);
byte[] dflchk = Arrays.CopyOf(dflbuf.GetData(), dflbuf.GetLength());
Assert.AssertArrayEquals(b, dflchk);
}
/// <exception cref="System.IO.IOException"/>
protected internal override void ProcessArguments(List <PathData> items)
{
base.ProcessArguments(items);
if (exitCode != 0)
{
// check for error collecting paths
return;
}
FSDataOutputStream @out = dst.fs.Create(dst.path);
try
{
foreach (PathData src in srcs)
{
FSDataInputStream @in = src.fs.Open(src.path);
try
{
IOUtils.CopyBytes(@in, @out, GetConf(), false);
if (delimiter != null)
{
@out.Write(Runtime.GetBytesForString(delimiter, "UTF-8"));
}
}
finally
{
@in.Close();
}
}
}
finally
{
@out.Close();
}
}
/// <exception cref="System.IO.IOException"/>
private long DumpFromOffset(PathData item, long offset)
{
long fileSize = item.RefreshStatus().GetLen();
if (offset > fileSize)
{
return(fileSize);
}
// treat a negative offset as relative to end of the file, floor of 0
if (offset < 0)
{
offset = Math.Max(fileSize + offset, 0);
}
FSDataInputStream @in = item.fs.Open(item.path);
try
{
@in.Seek(offset);
// use conf so the system configured io block size is used
IOUtils.CopyBytes(@in, System.Console.Out, GetConf(), false);
offset = @in.GetPos();
}
finally
{
@in.Close();
}
return(offset);
}
public virtual void TestMRWebAppSSLDisabled()
{
MRApp app = new _MRApp_175(2, 2, true, this.GetType().FullName, true);
Configuration conf = new Configuration();
// MR is explicitly disabling SSL, even though setting as HTTPS_ONLY
conf.Set(YarnConfiguration.YarnHttpPolicyKey, HttpConfig.Policy.HttpsOnly.ToString
());
Org.Apache.Hadoop.Mapreduce.V2.App.Job.Job job = app.Submit(conf);
string hostPort = NetUtils.GetHostPortString(((MRClientService)app.GetClientService
()).GetWebApp().GetListenerAddress());
// http:// should be accessible
Uri httpUrl = new Uri("http://" + hostPort);
HttpURLConnection conn = (HttpURLConnection)httpUrl.OpenConnection();
InputStream @in = conn.GetInputStream();
ByteArrayOutputStream @out = new ByteArrayOutputStream();
IOUtils.CopyBytes(@in, @out, 1024);
NUnit.Framework.Assert.IsTrue(@out.ToString().Contains("MapReduce Application"));
// https:// is not accessible.
Uri httpsUrl = new Uri("https://" + hostPort);
try
{
HttpURLConnection httpsConn = (HttpURLConnection)httpsUrl.OpenConnection();
httpsConn.GetInputStream();
NUnit.Framework.Assert.Fail("https:// is not accessible, expected to fail");
}
catch (Exception e)
{
NUnit.Framework.Assert.IsTrue(e is SSLException);
}
app.WaitForState(job, JobState.Succeeded);
app.VerifyCompleted();
}
/// <summary>Executes the filesystem operation.</summary>
/// <param name="fs">filesystem instance to use.</param>
/// <returns>void.</returns>
/// <exception cref="System.IO.IOException">thrown if an IO error occured.</exception>
public virtual Void Execute(FileSystem fs)
{
int bufferSize = fs.GetConf().GetInt("httpfs.buffer.size", 4096);
OutputStream os = fs.Append(path, bufferSize);
IOUtils.CopyBytes(@is, os, bufferSize, true);
os.Close();
return(null);
}
public virtual void TestCopyBytesWithCountShouldNotCloseStreamsWhenCloseIsFalse()
{
InputStream inputStream = Org.Mockito.Mockito.Mock <InputStream>();
OutputStream outputStream = Org.Mockito.Mockito.Mock <OutputStream>();
Org.Mockito.Mockito.DoReturn(-1).When(inputStream).Read(new byte[4096], 0, 1);
IOUtils.CopyBytes(inputStream, outputStream, (long)1, false);
Org.Mockito.Mockito.Verify(inputStream, Org.Mockito.Mockito.AtMost(0)).Close();
Org.Mockito.Mockito.Verify(outputStream, Org.Mockito.Mockito.AtMost(0)).Close();
}
/// <exception cref="System.Exception"/>
private static string ReadOut(Uri url)
{
HttpsURLConnection conn = (HttpsURLConnection)url.OpenConnection();
conn.SetSSLSocketFactory(clientSslFactory.CreateSSLSocketFactory());
InputStream @in = conn.GetInputStream();
ByteArrayOutputStream @out = new ByteArrayOutputStream();
IOUtils.CopyBytes(@in, @out, 1024);
return(@out.ToString());
}
/// <exception cref="System.IO.IOException"/>
private void PrintToStdout(InputStream @in)
{
try
{
IOUtils.CopyBytes(@in, @out, GetConf(), false);
}
finally
{
@in.Close();
}
}
/// <exception cref="System.IO.IOException"/>
public virtual void Write(OutputStream os)
{
IOUtils.SkipFully(@is, offset);
if (len == -1)
{
IOUtils.CopyBytes(@is, os, 4096, true);
}
else
{
IOUtils.CopyBytes(@is, os, len, true);
}
}
public virtual void TestCopyBytesShouldCloseStreamsWhenCloseIsTrue()
{
InputStream inputStream = Org.Mockito.Mockito.Mock <InputStream>();
OutputStream outputStream = Org.Mockito.Mockito.Mock <OutputStream>();
Org.Mockito.Mockito.DoReturn(-1).When(inputStream).Read(new byte[1]);
IOUtils.CopyBytes(inputStream, outputStream, 1, true);
Org.Mockito.Mockito.Verify(inputStream, Org.Mockito.Mockito.AtLeastOnce()).Close(
);
Org.Mockito.Mockito.Verify(outputStream, Org.Mockito.Mockito.AtLeastOnce()).Close
();
}
public virtual void Log4jFile()
{
InputStream @is = Org.Apache.Hadoop.Lib.Server.Server.GetResource("default-log4j.properties"
);
OutputStream os = new FileOutputStream(new FilePath(TestDirHelper.GetTestDir(), "server-log4j.properties"
));
IOUtils.CopyBytes(@is, os, 1024, true);
Configuration conf = new Configuration(false);
Org.Apache.Hadoop.Lib.Server.Server server = CreateServer(conf);
server.Init();
}
/// <exception cref="System.IO.IOException"/>
public virtual void TestFileSink()
{
outFile = GetTestTempFile("test-file-sink-", ".out");
string outPath = outFile.GetAbsolutePath();
// NB: specify large period to avoid multiple metrics snapshotting:
new ConfigBuilder().Add("*.period", 10000).Add("test.sink.mysink0.class", typeof(
FileSink).FullName).Add("test.sink.mysink0.filename", outPath).Add("test.sink.mysink0.context"
, "test1").Save(TestMetricsConfig.GetTestFilename("hadoop-metrics2-test"));
// NB: we filter by context to exclude "metricssystem" context metrics:
MetricsSystemImpl ms = new MetricsSystemImpl("test");
ms.Start();
TestFileSink.MyMetrics1 mm1 = new TestFileSink.MyMetrics1().RegisterWith(ms);
new TestFileSink.MyMetrics2().RegisterWith(ms);
mm1.testMetric1.Incr();
mm1.testMetric2.Incr(2);
ms.PublishMetricsNow();
// publish the metrics
ms.Stop();
ms.Shutdown();
InputStream @is = null;
ByteArrayOutputStream baos = null;
string outFileContent = null;
try
{
@is = new FileInputStream(outFile);
baos = new ByteArrayOutputStream((int)outFile.Length());
IOUtils.CopyBytes(@is, baos, 1024, true);
outFileContent = Runtime.GetStringForBytes(baos.ToByteArray(), "UTF-8");
}
finally
{
IOUtils.Cleanup(null, baos, @is);
}
// Check the out file content. Should be something like the following:
//1360244820087 test1.testRecord1: Context=test1, testTag1=testTagValue1, testTag2=testTagValue2, Hostname=myhost, testMetric1=1, testMetric2=2
//1360244820089 test1.testRecord2: Context=test1, testTag22=testTagValue22, Hostname=myhost
// Note that in the below expression we allow tags and metrics to go in arbitrary order.
Pattern expectedContentPattern = Pattern.Compile("^\\d+\\s+test1.testRecord1:\\s+Context=test1,\\s+"
+ "(testTag1=testTagValue1,\\s+testTag2=testTagValue2|testTag2=testTagValue2,\\s+testTag1=testTagValue1),"
+ "\\s+Hostname=.*,\\s+(testMetric1=1,\\s+testMetric2=2|testMetric2=2,\\s+testMetric1=1)"
+ "$[\\n\\r]*^\\d+\\s+test1.testRecord2:\\s+Context=test1," + "\\s+testTag22=testTagValue22,\\s+Hostname=.*$[\\n\\r]*"
, Pattern.Multiline);
// line #1:
// line #2:
Assert.True(expectedContentPattern.Matcher(outFileContent).Matches
());
}
// Helper filter filesystem that registers created files as temp files to
// be deleted on exit unless successfully renamed
/// <exception cref="System.IO.IOException"/>
internal virtual void WriteStreamToFile(InputStream @in, PathData target, bool lazyPersist
)
{
FSDataOutputStream @out = null;
try
{
@out = Create(target, lazyPersist);
IOUtils.CopyBytes(@in, @out, GetConf(), true);
}
finally
{
IOUtils.CloseStream(@out);
}
}
/// <summary>Read dataFile and compute its MD5 checksum.</summary>
/// <exception cref="System.IO.IOException"/>
public static MD5Hash ComputeMd5ForFile(FilePath dataFile)
{
InputStream @in = new FileInputStream(dataFile);
try
{
MessageDigest digester = MD5Hash.GetDigester();
DigestInputStream dis = new DigestInputStream(@in, digester);
IOUtils.CopyBytes(dis, new IOUtils.NullOutputStream(), 128 * 1024);
return(new MD5Hash(digester.Digest()));
}
finally
{
IOUtils.CloseStream(@in);
}
}
/// <summary>Executes the filesystem operation.</summary>
/// <param name="fs">filesystem instance to use.</param>
/// <returns>The URI of the created file.</returns>
/// <exception cref="System.IO.IOException">thrown if an IO error occured.</exception>
public virtual Void Execute(FileSystem fs)
{
if (replication == -1)
{
replication = fs.GetDefaultReplication(path);
}
if (blockSize == -1)
{
blockSize = fs.GetDefaultBlockSize(path);
}
FsPermission fsPermission = new FsPermission(permission);
int bufferSize = fs.GetConf().GetInt("httpfs.buffer.size", 4096);
OutputStream os = fs.Create(path, fsPermission, @override, bufferSize, replication
, blockSize, null);
IOUtils.CopyBytes(@is, os, bufferSize, true);
os.Close();
return(null);
}
/// <exception cref="System.IO.IOException"/>
protected internal override void ProcessArguments(List <PathData> args)
{
if (!dst.exists)
{
dst.fs.Create(dst.path, false).Close();
}
InputStream @is = null;
FSDataOutputStream fos = dst.fs.Append(dst.path);
try
{
if (readStdin)
{
if (args.Count == 0)
{
IOUtils.CopyBytes(Runtime.@in, fos, DefaultIoLength);
}
else
{
throw new IOException("stdin (-) must be the sole input argument when present");
}
}
// Read in each input file and write to the target.
foreach (PathData source in args)
{
@is = new FileInputStream(source.ToFile());
IOUtils.CopyBytes(@is, fos, DefaultIoLength);
IOUtils.CloseStream(@is);
@is = null;
}
}
finally
{
if (@is != null)
{
IOUtils.CloseStream(@is);
}
if (fos != null)
{
IOUtils.CloseStream(fos);
}
}
}
public virtual void TestCopyBytesShouldCloseInputSteamWhenOutputStreamCloseThrowsException
()
{
InputStream inputStream = Org.Mockito.Mockito.Mock <InputStream>();
OutputStream outputStream = Org.Mockito.Mockito.Mock <OutputStream>();
Org.Mockito.Mockito.DoReturn(-1).When(inputStream).Read(new byte[1]);
Org.Mockito.Mockito.DoThrow(new IOException()).When(outputStream).Close();
try
{
IOUtils.CopyBytes(inputStream, outputStream, 1, true);
}
catch (IOException)
{
}
Org.Mockito.Mockito.Verify(inputStream, Org.Mockito.Mockito.AtLeastOnce()).Close(
);
Org.Mockito.Mockito.Verify(outputStream, Org.Mockito.Mockito.AtLeastOnce()).Close
();
}
/// <summary>Copy specified file into a temporary file.</summary>
/// <remarks>
/// Copy specified file into a temporary file. Then rename the
/// temporary file to the original name. This will cause any
/// hardlinks to the original file to be removed. The temporary
/// files are created in the same directory. The temporary files will
/// be recovered (especially on Windows) on datanode restart.
/// </remarks>
/// <exception cref="System.IO.IOException"/>
private void UnlinkFile(FilePath file, Block b)
{
FilePath tmpFile = DatanodeUtil.CreateTmpFile(b, DatanodeUtil.GetUnlinkTmpFile(file
));
try
{
FileInputStream @in = new FileInputStream(file);
try
{
FileOutputStream @out = new FileOutputStream(tmpFile);
try
{
IOUtils.CopyBytes(@in, @out, 16 * 1024);
}
finally
{
@out.Close();
}
}
finally
{
@in.Close();
}
if (file.Length() != tmpFile.Length())
{
throw new IOException("Copy of file " + file + " size " + file.Length() + " into file "
+ tmpFile + " resulted in a size of " + tmpFile.Length());
}
FileUtil.ReplaceFile(tmpFile, file);
}
catch (IOException e)
{
bool done = tmpFile.Delete();
if (!done)
{
DataNode.Log.Info("detachFile failed to delete temporary file " + tmpFile);
}
throw;
}
}
/// <summary>Unpack matching files from a jar.</summary>
/// <remarks>
/// Unpack matching files from a jar. Entries inside the jar that do
/// not match the given pattern will be skipped.
/// </remarks>
/// <param name="jarFile">the .jar file to unpack</param>
/// <param name="toDir">the destination directory into which to unpack the jar</param>
/// <param name="unpackRegex">the pattern to match jar entries against</param>
/// <exception cref="System.IO.IOException"/>
public static void UnJar(FilePath jarFile, FilePath toDir, Pattern unpackRegex
)
{
JarFile jar = new JarFile(jarFile);
try
{
Enumeration <JarEntry> entries = ((Enumeration <JarEntry>)jar.Entries());
while (entries.MoveNext())
{
JarEntry entry = entries.Current;
if (!entry.IsDirectory() && unpackRegex.Matcher(entry.GetName()).Matches())
{
InputStream @in = jar.GetInputStream(entry);
try
{
FilePath file = new FilePath(toDir, entry.GetName());
EnsureDirectory(file.GetParentFile());
OutputStream @out = new FileOutputStream(file);
try
{
IOUtils.CopyBytes(@in, @out, 8192);
}
finally
{
@out.Close();
}
}
finally
{
@in.Close();
}
}
}
}
finally
{
jar.Close();
}
}
/// <exception cref="System.IO.IOException"/>
private static void CreateUnlinkTmpFile(ReplicaInfo replicaInfo, bool changeBlockFile
, bool isRename)
{
FilePath src;
if (changeBlockFile)
{
src = replicaInfo.GetBlockFile();
}
else
{
src = replicaInfo.GetMetaFile();
}
FilePath dst = DatanodeUtil.GetUnlinkTmpFile(src);
if (isRename)
{
src.RenameTo(dst);
}
else
{
FileInputStream @in = new FileInputStream(src);
try
{
FileOutputStream @out = new FileOutputStream(dst);
try
{
IOUtils.CopyBytes(@in, @out, 1);
}
finally
{
@out.Close();
}
}
finally
{
@in.Close();
}
}
}
/// <exception cref="System.Exception"/>
private void DoTestEntirelyCorruptFile(int numDataNodes)
{
long fileSize = 4096;
Path file = new Path("/testFile");
short replFactor = (short)numDataNodes;
Configuration conf = new Configuration();
conf.SetInt(DFSConfigKeys.DfsReplicationKey, numDataNodes);
// Set short retry timeouts so this test runs faster
conf.SetInt(DFSConfigKeys.DfsClientRetryWindowBase, 10);
MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).NumDataNodes(numDataNodes
).Build();
try
{
cluster.WaitActive();
FileSystem fs = cluster.GetFileSystem();
DFSTestUtil.CreateFile(fs, file, fileSize, replFactor, 12345L);
/*seed*/
DFSTestUtil.WaitReplication(fs, file, replFactor);
ExtendedBlock block = DFSTestUtil.GetFirstBlock(fs, file);
int blockFilesCorrupted = cluster.CorruptBlockOnDataNodes(block);
NUnit.Framework.Assert.AreEqual("All replicas not corrupted", replFactor, blockFilesCorrupted
);
try
{
IOUtils.CopyBytes(fs.Open(file), new IOUtils.NullOutputStream(), conf, true);
NUnit.Framework.Assert.Fail("Didn't get exception");
}
catch (IOException ioe)
{
DFSClient.Log.Info("Got expected exception", ioe);
}
}
finally
{
cluster.Shutdown();
}
}
/// <exception cref="System.Exception"/>
public virtual void TestManyClosedSocketsInCache()
{
// Make a small file
Configuration clientConf = new Configuration(conf);
clientConf.Set(DFSConfigKeys.DfsClientContext, "testManyClosedSocketsInCache");
DistributedFileSystem fs = (DistributedFileSystem)FileSystem.Get(cluster.GetURI()
, clientConf);
PeerCache peerCache = ClientContext.GetFromConf(clientConf).GetPeerCache();
DFSTestUtil.CreateFile(fs, TestFile, 1L, (short)1, 0L);
// Insert a bunch of dead sockets in the cache, by opening
// many streams concurrently, reading all of the data,
// and then closing them.
InputStream[] stms = new InputStream[5];
try
{
for (int i = 0; i < stms.Length; i++)
{
stms[i] = fs.Open(TestFile);
}
foreach (InputStream stm in stms)
{
IOUtils.CopyBytes(stm, new IOUtils.NullOutputStream(), 1024);
}
}
finally
{
IOUtils.Cleanup(null, stms);
}
NUnit.Framework.Assert.AreEqual(5, peerCache.Size());
// Let all the xceivers timeout
Sharpen.Thread.Sleep(1500);
AssertXceiverCount(0);
// Client side still has the sockets cached
NUnit.Framework.Assert.AreEqual(5, peerCache.Size());
// Reading should not throw an exception.
DFSTestUtil.ReadFile(fs, TestFile);
}
/// <exception cref="System.IO.IOException"/>
internal virtual void GzipConcatTest(Configuration conf, Type decomClass)
{
Random r = new Random();
long seed = r.NextLong();
r.SetSeed(seed);
Log.Info(decomClass + " seed: " + seed);
int Concat = r.Next(4) + 3;
int Buflen = 128 * 1024;
DataOutputBuffer dflbuf = new DataOutputBuffer();
DataOutputBuffer chkbuf = new DataOutputBuffer();
byte[] b = new byte[Buflen];
for (int i = 0; i < Concat; ++i)
{
GZIPOutputStream gzout = new GZIPOutputStream(dflbuf);
r.NextBytes(b);
int len = r.Next(Buflen);
int off = r.Next(Buflen - len);
chkbuf.Write(b, off, len);
gzout.Write(b, off, len);
gzout.Close();
}
byte[] chk = Arrays.CopyOf(chkbuf.GetData(), chkbuf.GetLength());
CompressionCodec codec = ReflectionUtils.NewInstance <GzipCodec>(conf);
Decompressor decom = codec.CreateDecompressor();
NUnit.Framework.Assert.IsNotNull(decom);
Assert.Equal(decomClass, decom.GetType());
DataInputBuffer gzbuf = new DataInputBuffer();
gzbuf.Reset(dflbuf.GetData(), dflbuf.GetLength());
InputStream gzin = codec.CreateInputStream(gzbuf, decom);
dflbuf.Reset();
IOUtils.CopyBytes(gzin, dflbuf, 4096);
byte[] dflchk = Arrays.CopyOf(dflbuf.GetData(), dflbuf.GetLength());
Assert.AssertArrayEquals(chk, dflchk);
}
public virtual void TestCopyBytesWithCountShouldThrowOutTheStreamClosureExceptions
()
{
InputStream inputStream = Org.Mockito.Mockito.Mock <InputStream>();
OutputStream outputStream = Org.Mockito.Mockito.Mock <OutputStream>();
Org.Mockito.Mockito.DoReturn(-1).When(inputStream).Read(new byte[4096], 0, 1);
Org.Mockito.Mockito.DoThrow(new IOException("Exception in closing the stream")).When
(outputStream).Close();
try
{
IOUtils.CopyBytes(inputStream, outputStream, (long)1, true);
NUnit.Framework.Assert.Fail("Should throw out the exception");
}
catch (IOException e)
{
Assert.Equal("Not throwing the expected exception.", "Exception in closing the stream"
, e.Message);
}
Org.Mockito.Mockito.Verify(inputStream, Org.Mockito.Mockito.AtLeastOnce()).Close(
);
Org.Mockito.Mockito.Verify(outputStream, Org.Mockito.Mockito.AtLeastOnce()).Close
();
}
/// <summary>Download link and have it be the response.</summary>
/// <param name="req">the http request</param>
/// <param name="resp">the http response</param>
/// <param name="link">the link to download</param>
/// <param name="c">the cookie to set if any</param>
/// <exception cref="System.IO.IOException">on any error.</exception>
private static void ProxyLink(HttpServletRequest req, HttpServletResponse resp, URI
link, Cookie c, string proxyHost)
{
DefaultHttpClient client = new DefaultHttpClient();
client.GetParams().SetParameter(ClientPNames.CookiePolicy, CookiePolicy.BrowserCompatibility
).SetBooleanParameter(ClientPNames.AllowCircularRedirects, true);
// Make sure we send the request from the proxy address in the config
// since that is what the AM filter checks against. IP aliasing or
// similar could cause issues otherwise.
IPAddress localAddress = Sharpen.Extensions.GetAddressByName(proxyHost);
if (Log.IsDebugEnabled())
{
Log.Debug("local InetAddress for proxy host: {}", localAddress);
}
client.GetParams().SetParameter(ConnRoutePNames.LocalAddress, localAddress);
HttpGet httpGet = new HttpGet(link);
Enumeration <string> names = req.GetHeaderNames();
while (names.MoveNext())
{
string name = names.Current;
if (passThroughHeaders.Contains(name))
{
string value = req.GetHeader(name);
if (Log.IsDebugEnabled())
{
Log.Debug("REQ HEADER: {} : {}", name, value);
}
httpGet.SetHeader(name, value);
}
}
string user = req.GetRemoteUser();
if (user != null && !user.IsEmpty())
{
httpGet.SetHeader("Cookie", ProxyUserCookieName + "=" + URLEncoder.Encode(user, "ASCII"
));
}
OutputStream @out = resp.GetOutputStream();
try
{
HttpResponse httpResp = client.Execute(httpGet);
resp.SetStatus(httpResp.GetStatusLine().GetStatusCode());
foreach (Header header in httpResp.GetAllHeaders())
{
resp.SetHeader(header.GetName(), header.GetValue());
}
if (c != null)
{
resp.AddCookie(c);
}
InputStream @in = httpResp.GetEntity().GetContent();
if (@in != null)
{
IOUtils.CopyBytes(@in, @out, 4096, true);
}
}
finally
{
httpGet.ReleaseConnection();
}
}
/* Copy count bytes at the given offset from one stream to another */
/// <exception cref="System.IO.IOException"/>
internal static void CopyFromOffset(FSDataInputStream @in, OutputStream @out, long
offset, long count)
{
@in.Seek(offset);
IOUtils.CopyBytes(@in, @out, count, false);
}