/**
* Check how prefetch override works.
*
* @throws Exception IF failed.
*/
public void testOpenPrefetchOverride() throws Exception {
create(igfsSecondary, paths(DIR, SUBDIR), paths(FILE));
// Write enough data to the secondary file system.
final int blockSize = IGFS_BLOCK_SIZE;
IgfsOutputStream out = igfsSecondary.append(FILE, false);
int totalWritten = 0;
while (totalWritten < blockSize * 2 + chunk.length) {
out.write(chunk);
totalWritten += chunk.length;
}
out.close();
awaitFileClose(igfsSecondary.asSecondary(), FILE);
// Instantiate file system with overridden "seq reads before prefetch" property.
Configuration cfg = new Configuration();
cfg.addResource(U.resolveIgniteUrl(PRIMARY_CFG));
int seqReads = SEQ_READS_BEFORE_PREFETCH + 1;
cfg.setInt(String.format(PARAM_IGFS_SEQ_READS_BEFORE_PREFETCH, "igfs:grid@"), seqReads);
FileSystem fs = FileSystem.get(new URI(PRIMARY_URI), cfg);
// Read the first two blocks.
Path fsHome = new Path(PRIMARY_URI);
Path dir = new Path(fsHome, DIR.name());
Path subdir = new Path(dir, SUBDIR.name());
Path file = new Path(subdir, FILE.name());
FSDataInputStream fsIn = fs.open(file);
final byte[] readBuf = new byte[blockSize * 2];
fsIn.readFully(0, readBuf, 0, readBuf.length);
// Wait for a while for prefetch to finish (if any).
IgfsMetaManager meta = igfs.context().meta();
IgfsFileInfo info = meta.info(meta.fileId(FILE));
IgfsBlockKey key = new IgfsBlockKey(info.id(), info.affinityKey(), info.evictExclude(), 2);
IgniteCache<IgfsBlockKey, byte[]> dataCache =
igfs.context().kernalContext().cache().jcache(igfs.configuration().getDataCacheName());
for (int i = 0; i < 10; i++) {
if (dataCache.containsKey(key)) break;
else U.sleep(100);
}
fsIn.close();
// Remove the file from the secondary file system.
igfsSecondary.delete(FILE, false);
// Try reading the third block. Should fail.
GridTestUtils.assertThrows(
log,
new Callable<Object>() {
@Override
public Object call() throws Exception {
IgfsInputStream in0 = igfs.open(FILE);
in0.seek(blockSize * 2);
try {
in0.read(readBuf);
} finally {
U.closeQuiet(in0);
}
return null;
}
},
IOException.class,
"Failed to read data due to secondary file system exception: /dir/subdir/file");
}