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

Introduction

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

Prototype

public boolean hasNext() throws DBException 

Source Link

Document

Returns true if the iteration has more elements.

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  av a  2  s .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();
            }
        }
    }
}

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