/// <summary>
/// Test that when we have an uncache request, and the client refuses to release
/// the replica for a long time, we will un-mlock it.
/// </summary>
/// <exception cref="System.Exception"/>
public virtual void TestRevocation()
{
Assume.AssumeTrue(NativeCodeLoader.IsNativeCodeLoaded() && !Path.Windows);
BlockReaderTestUtil.EnableHdfsCachingTracing();
BlockReaderTestUtil.EnableShortCircuitShmTracing();
Configuration conf = GetDefaultConf();
// Set a really short revocation timeout.
conf.SetLong(DFSConfigKeys.DfsDatanodeCacheRevocationTimeoutMs, 250L);
// Poll very often
conf.SetLong(DFSConfigKeys.DfsDatanodeCacheRevocationPollingMs, 2L);
MiniDFSCluster cluster = null;
cluster = new MiniDFSCluster.Builder(conf).NumDataNodes(1).Build();
cluster.WaitActive();
DistributedFileSystem dfs = cluster.GetFileSystem();
// Create and cache a file.
string TestFile = "/test_file2";
DFSTestUtil.CreateFile(dfs, new Path(TestFile), BlockSize, (short)1, unchecked ((int
)(0xcafe)));
dfs.AddCachePool(new CachePoolInfo("pool"));
long cacheDirectiveId = dfs.AddCacheDirective(new CacheDirectiveInfo.Builder().SetPool
("pool").SetPath(new Path(TestFile)).SetReplication((short)1).Build());
FsDatasetSpi <object> fsd = cluster.GetDataNodes()[0].GetFSDataset();
DFSTestUtil.VerifyExpectedCacheUsage(BlockSize, 1, fsd);
// Mmap the file.
FSDataInputStream @in = dfs.Open(new Path(TestFile));
ByteBuffer buf = @in.Read(null, BlockSize, EnumSet.NoneOf <ReadOption>());
// Attempt to uncache file. The file should get uncached.
Log.Info("removing cache directive {}", cacheDirectiveId);
dfs.RemoveCacheDirective(cacheDirectiveId);
Log.Info("finished removing cache directive {}", cacheDirectiveId);
Sharpen.Thread.Sleep(1000);
DFSTestUtil.VerifyExpectedCacheUsage(0, 0, fsd);
// Cleanup
@in.ReleaseBuffer(buf);
@in.Close();
cluster.Shutdown();
}
