本文整理汇总了Java中org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.PositionTrackingInputStream类的典型用法代码示例。如果您正苦于以下问题：Java PositionTrackingInputStream类的具体用法？Java PositionTrackingInputStream怎么用？Java PositionTrackingInputStream使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
PositionTrackingInputStream类属于org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader包，在下文中一共展示了PositionTrackingInputStream类的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: refresh
import org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.PositionTrackingInputStream; //导入依赖的package包/类
/**
* Refresh, preferably to a known position
* @see EditLogInputStream#refresh(long)
* @see BookKeeperJournalInputStream#position(long)
*/
@Override
public void refresh(long position, long skippedUntilTxid) throws IOException {
checkInitialized();
if (isInProgress()) {
// If a ledger is in progress, re-open it for reading in order
// to determine the correct bounds of the ledger.
LedgerHandle ledger = ledgerProvider.openForReading(ledgerId);
journalInputStream.resetLedger(ledger);
}
// Try to set the underlying stream to the specified position
journalInputStream.position(position);
// Reload the position tracker and log reader to adjust to the newly
// refreshed position
bin = new BufferedInputStream(journalInputStream);
tracker = new PositionTrackingInputStream(bin, position);
DataInputStream in = new DataInputStream(tracker);
if (position == 0) { // If we are at the beginning, re-read the version
logVersion = readLogVersion(in);
}
reader = new Reader(in, logVersion);
}
示例2: init
import org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.PositionTrackingInputStream; //导入依赖的package包/类
public void init() throws IOException {
LedgerHandle ledger = ledgerProvider.openForReading(ledgerId);
if (!isInProgress() && firstBookKeeperEntry > ledger.getLastAddConfirmed()) {
// ledger.getLastAddConfirmed() returns the last quorum-acknowledged entry
// id in the ledger. Unless the segment is in-progress, we should throw
// an exception if this last entry is lower than the first expected entry id.
throw new IllegalArgumentException(
"Invalid first BookKeeper entry to read: " + firstBookKeeperEntry +
" > last confirmed entry id(" + ledger.getLastAddConfirmed() +
")");
}
journalInputStream = new BookKeeperJournalInputStream(ledger,
firstBookKeeperEntry);
bin = new BufferedInputStream(journalInputStream);
tracker = new PositionTrackingInputStream(bin, 0);
DataInputStream in = new DataInputStream(tracker);
try {
logVersion = readLogVersion(in);
} catch (EOFException e) {
throw new LedgerHeaderCorruptException("No header file in the ledger");
}
reader = new Reader(in, logVersion);
LOG.info("Reading from ledger id " + ledgerId +
", starting with book keeper entry id " + firstBookKeeperEntry +
", log version " + logVersion +
", first txn id " +
firstTxId + (isInProgress() ?
", in-progress log segment"
: (" last txn id " + lastTxId))
+ ".");
}