/// <summary>try to access a block on a data node.</summary>
/// <remarks>try to access a block on a data node. If fails - throws exception</remarks>
/// <param name="datanode"/>
/// <param name="lblock"/>
/// <exception cref="System.IO.IOException"/>
private void AccessBlock(DatanodeInfo datanode, LocatedBlock lblock)
{
IPEndPoint targetAddr = null;
ExtendedBlock block = lblock.GetBlock();
targetAddr = NetUtils.CreateSocketAddr(datanode.GetXferAddr());
BlockReader blockReader = new BlockReaderFactory(new DFSClient.Conf(conf)).SetInetSocketAddress
(targetAddr).SetBlock(block).SetFileName(BlockReaderFactory.GetFileName(targetAddr
, "test-blockpoolid", block.GetBlockId())).SetBlockToken(lblock.GetBlockToken())
.SetStartOffset(0).SetLength(-1).SetVerifyChecksum(true).SetClientName("TestDataNodeVolumeFailure"
).SetDatanodeInfo(datanode).SetCachingStrategy(CachingStrategy.NewDefaultStrategy
()).SetClientCacheContext(ClientContext.GetFromConf(conf)).SetConfiguration(conf
).SetRemotePeerFactory(new _RemotePeerFactory_422(this)).Build();
blockReader.Close();
}
// try reading a block using a BlockReader directly
private static void TryRead(Configuration conf, LocatedBlock lblock, bool shouldSucceed
)
{
IPEndPoint targetAddr = null;
IOException ioe = null;
BlockReader blockReader = null;
ExtendedBlock block = lblock.GetBlock();
try
{
DatanodeInfo[] nodes = lblock.GetLocations();
targetAddr = NetUtils.CreateSocketAddr(nodes[0].GetXferAddr());
blockReader = new BlockReaderFactory(new DFSClient.Conf(conf)).SetFileName(BlockReaderFactory
.GetFileName(targetAddr, "test-blockpoolid", block.GetBlockId())).SetBlock(block
).SetBlockToken(lblock.GetBlockToken()).SetInetSocketAddress(targetAddr).SetStartOffset
(0).SetLength(-1).SetVerifyChecksum(true).SetClientName("TestBlockTokenWithDFS")
.SetDatanodeInfo(nodes[0]).SetCachingStrategy(CachingStrategy.NewDefaultStrategy
()).SetClientCacheContext(ClientContext.GetFromConf(conf)).SetConfiguration(conf
).SetRemotePeerFactory(new _RemotePeerFactory_162(conf)).Build();
}
catch (IOException ex)
{
ioe = ex;
}
finally
{
if (blockReader != null)
{
try
{
blockReader.Close();
}
catch (IOException e)
{
throw new RuntimeException(e);
}
}
}
if (shouldSucceed)
{
NUnit.Framework.Assert.IsNotNull("OP_READ_BLOCK: access token is invalid, " + "when it is expected to be valid"
, blockReader);
}
else
{
NUnit.Framework.Assert.IsNotNull("OP_READ_BLOCK: access token is valid, " + "when it is expected to be invalid"
, ioe);
NUnit.Framework.Assert.IsTrue("OP_READ_BLOCK failed due to reasons other than access token: "
, ioe is InvalidBlockTokenException);
}
}