Examples with FileTxnIterator org.apache.zookeeper.server.persistence.FileTxnLog.FileTxnIterator used on opensource projects

Example 1 with FileTxnIterator

use of org.apache.zookeeper.server.persistence.FileTxnLog.FileTxnIterator in project zookeeper by apache.

the class LoadFromLogTest method testLoad.

/**
 * test that all transactions from the Log are loaded, and only once
 * @throws Exception an exception might be thrown here
 */
@Test
public void testLoad() throws Exception {
    // generate some transactions that will get logged
    ZooKeeper zk = createZKClient(hostPort);
    try {
        for (int i = 0; i < NUM_MESSAGES; i++) {
            zk.create("/invalidsnap-" + i, new byte[0], Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
        }
    } finally {
        zk.close();
    }
    stopServer();
    // now verify that the FileTxnLog reads every transaction only once
    File logDir = new File(tmpDir, FileTxnSnapLog.version + FileTxnSnapLog.VERSION);
    FileTxnLog txnLog = new FileTxnLog(logDir);
    TxnIterator itr = txnLog.read(0);
    // Check that storage space return some value
    FileTxnIterator fileItr = (FileTxnIterator) itr;
    long storageSize = fileItr.getStorageSize();
    LOG.info("Txnlog size: {} bytes", storageSize);
    assertTrue((storageSize > 0), "Storage size is greater than zero ");
    long expectedZxid = 0;
    long lastZxid = 0;
    TxnHeader hdr;
    do {
        hdr = itr.getHeader();
        expectedZxid++;
        assertTrue(lastZxid != hdr.getZxid(), "not the same transaction. lastZxid=" + lastZxid + ", zxid=" + hdr.getZxid());
        assertTrue((hdr.getZxid() == expectedZxid), "excepting next transaction. expected=" + expectedZxid + ", retrieved=" + hdr.getZxid());
        lastZxid = hdr.getZxid();
    } while (itr.next());
    assertTrue((expectedZxid == TOTAL_TRANSACTIONS), "processed all transactions. " + expectedZxid + " == " + TOTAL_TRANSACTIONS);
}