Example usage for org.apache.hadoop.yarn.server.utils LeveldbIterator seek

Introduction

In this page you can find the example usage for org.apache.hadoop.yarn.server.utils LeveldbIterator seek.

Prototype

public void seek(byte[] key) throws DBException 

Source Link

Document

Repositions the iterator so the key of the next BlockElement returned greater than or equal to the specified targetKey.

Usage

From source file:org.apache.tez.auxservices.ShuffleHandler.java

License:Apache License

private void recoverState(Configuration conf) throws IOException {
    Path recoveryRoot = getRecoveryPath();
    if (recoveryRoot != null) {
        startStore(recoveryRoot);/*from   ww w. j  a  v a2s .c o  m*/
        Pattern jobPattern = Pattern.compile(JobID.JOBID_REGEX);
        LeveldbIterator iter = null;
        try {
            iter = new LeveldbIterator(stateDb);
            iter.seek(bytes(JobID.JOB));
            while (iter.hasNext()) {
                Map.Entry<byte[], byte[]> entry = iter.next();
                String key = asString(entry.getKey());
                if (!jobPattern.matcher(key).matches()) {
                    break;
                }
                recoverJobShuffleInfo(key, entry.getValue());
            }
        } catch (DBException e) {
            throw new IOException("Database error during recovery", e);
        } finally {
            if (iter != null) {
                iter.close();
            }
        }
    }
}

---