/// <summary>close opened files.</summary>
/// <exception cref="System.IO.IOException"/>
public virtual void Close()
{
if (blockInFd != null && ((dropCacheBehindAllReads) || (dropCacheBehindLargeReads &&
IsLongRead())))
{
try
{
NativeIO.POSIX.GetCacheManipulator().PosixFadviseIfPossible(block.GetBlockName(),
blockInFd, lastCacheDropOffset, offset - lastCacheDropOffset, NativeIO.POSIX.PosixFadvDontneed
);
}
catch (Exception e)
{
Log.Warn("Unable to drop cache on file close", e);
}
}
if (curReadahead != null)
{
curReadahead.Cancel();
}
IOException ioe = null;
if (checksumIn != null)
{
try
{
checksumIn.Close();
}
catch (IOException e)
{
// close checksum file
ioe = e;
}
checksumIn = null;
}
if (blockIn != null)
{
try
{
blockIn.Close();
}
catch (IOException e)
{
// close data file
ioe = e;
}
blockIn = null;
blockInFd = null;
}
if (volumeRef != null)
{
IOUtils.Cleanup(null, volumeRef);
volumeRef = null;
}
// throw IOException if there is any
if (ioe != null)
{
throw ioe;
}
}
/// <summary>Create a file with one block and corrupt some/all of the block replicas.
/// </summary>
/// <exception cref="System.IO.IOException"/>
/// <exception cref="Org.Apache.Hadoop.Security.AccessControlException"/>
/// <exception cref="System.IO.FileNotFoundException"/>
/// <exception cref="Org.Apache.Hadoop.FS.UnresolvedLinkException"/>
/// <exception cref="System.Exception"/>
/// <exception cref="Sharpen.TimeoutException"/>
private void CreateAFileWithCorruptedBlockReplicas(Path filePath, short repl, int
corruptBlockCount)
{
DFSTestUtil.CreateFile(dfs, filePath, BlockSize, repl, 0);
DFSTestUtil.WaitReplication(dfs, filePath, repl);
// Locate the file blocks by asking name node
LocatedBlocks locatedblocks = dfs.dfs.GetNamenode().GetBlockLocations(filePath.ToString
(), 0L, BlockSize);
NUnit.Framework.Assert.AreEqual(repl, locatedblocks.Get(0).GetLocations().Length);
// The file only has one block
LocatedBlock lblock = locatedblocks.Get(0);
DatanodeInfo[] datanodeinfos = lblock.GetLocations();
ExtendedBlock block = lblock.GetBlock();
// corrupt some /all of the block replicas
for (int i = 0; i < corruptBlockCount; i++)
{
DatanodeInfo dninfo = datanodeinfos[i];
DataNode dn = cluster.GetDataNode(dninfo.GetIpcPort());
CorruptBlock(block, dn);
Log.Debug("Corrupted block " + block.GetBlockName() + " on data node " + dninfo);
}
}
