Package org.apache.zookeeper.server.persistence.TxnLog

Examples of org.apache.zookeeper.server.persistence.TxnLog.TxnIterator

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        // 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: " + storageSize + " bytes");
        Assert.assertTrue("Storage size is greater than zero ",
                (storageSize > 0));
       
        long expectedZxid = 0;
        long lastZxid = 0;
        TxnHeader hdr;
        do {
            hdr = itr.getHeader();
            expectedZxid++;
            Assert.assertTrue("not the same transaction. lastZxid=" + lastZxid + ", zxid=" + hdr.getZxid(), lastZxid != hdr.getZxid());
            Assert.assertTrue("excepting next transaction. expected=" + expectedZxid + ", retreived=" + hdr.getZxid(), (hdr.getZxid() == expectedZxid));
            lastZxid = hdr.getZxid();
        }while(itr.next());

        Assert.assertTrue("processed all transactions. " + expectedZxid + " == " + TOTAL_TRANSACTIONS, (expectedZxid == TOTAL_TRANSACTIONS));
        zks.shutdown();
    }
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        // Find zxid for the second log
        long secondStartZxid = Util.getZxidFromName(logFiles[1].getName(), "log");

        FileTxnLog txnLog = new FileTxnLog(logDir);
        TxnIterator itr = txnLog.read(1, false);

        // Oldest log is already remove, so this should point to the start of
        // of zxid on the second log
        Assert.assertEquals(secondStartZxid, itr.getHeader().getZxid());

        itr = txnLog.read(secondStartZxid, false);
        Assert.assertEquals(secondStartZxid, itr.getHeader().getZxid());
        Assert.assertTrue(itr.next());

        // Trying to get a second txn on second txnlog give us the
        // the start of second log, since the first one is removed
        long nextZxid = itr.getHeader().getZxid();

        itr = txnLog.read(nextZxid, false);
        Assert.assertEquals(secondStartZxid, itr.getHeader().getZxid());

        // Trying to get a first txn on the third give us the
        // the start of second log, since the first one is removed
        long thirdStartZxid = Util.getZxidFromName(logFiles[2].getName(), "log");
        itr = txnLog.read(thirdStartZxid, false);
        Assert.assertEquals(secondStartZxid, itr.getHeader().getZxid());
        Assert.assertTrue(itr.next());

        nextZxid = itr.getHeader().getZxid();
        itr = txnLog.read(nextZxid, false);
        Assert.assertEquals(secondStartZxid, itr.getHeader().getZxid());

    }
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        zkdb.close();

        // verify that the truncation and subsequent append were processed
        // correctly
        FileTxnLog txnlog = new FileTxnLog(new File(tmpdir, "version-2"));
        TxnIterator iter = txnlog.read(1);

        TxnHeader hdr = iter.getHeader();
        Record txn = iter.getTxn();
        Assert.assertEquals(1, hdr.getZxid());
        Assert.assertTrue(txn instanceof SetDataTxn);

        iter.next();

        hdr = iter.getHeader();
        txn = iter.getTxn();
        Assert.assertEquals(200, hdr.getZxid());
        Assert.assertTrue(txn instanceof SetDataTxn);
        iter.close();
        ClientBase.recursiveDelete(tmpdir);
    }
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                Util.getZxidFromName(files[files.length-1].getName(),"log"):-1;

        // if a log file is more recent we must scan it to find
        // the highest zxid
        long zxid = maxLog;
        TxnIterator itr = null;
        try {
            FileTxnLog txn = new FileTxnLog(logDir);
            itr = txn.read(maxLog);
            while (true) {
                if(!itr.next())
                    break;
                TxnHeader hdr = itr.getHeader();
                zxid = hdr.getZxid();
            }
        } catch (IOException e) {
            LOG.warn("Unexpected exception", e);
        } finally {
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     */
    public long restore(DataTree dt, Map<Long, Integer> sessions,
            PlayBackListener listener) throws IOException {
        snapLog.deserialize(dt, sessions);
        FileTxnLog txnLog = new FileTxnLog(dataDir);
        TxnIterator itr = txnLog.read(dt.lastProcessedZxid+1);
        long highestZxid = dt.lastProcessedZxid;
        TxnHeader hdr;
        try {
            while (true) {
                // iterator points to
                // the first valid txn when initialized
                hdr = itr.getHeader();
                if (hdr == null) {
                    //empty logs
                    return dt.lastProcessedZxid;
                }
                if (hdr.getZxid() < highestZxid && highestZxid != 0) {
                    LOG.error("{}(higestZxid) > {}(next log) for type {}",
                            new Object[] { highestZxid, hdr.getZxid(),
                                    hdr.getType() });
                } else {
                    highestZxid = hdr.getZxid();
                }
                try {
                    processTransaction(hdr,dt,sessions, itr.getTxn());
                } catch(KeeperException.NoNodeException e) {
                   throw new IOException("Failed to process transaction type: " +
                         hdr.getType() + " error: " + e.getMessage(), e);
                }
                listener.onTxnLoaded(hdr, itr.getTxn());
                if (!itr.next())
                    break;
            }
        } finally {
            if (itr != null) {
                itr.close();
            }
        }
        return highestZxid;
    }
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Related Classes of org.apache.zookeeper.server.persistence.TxnLog.TxnIterator

  • org.apache.zookeeper.server.CRCTest
  • org.apache.zookeeper.server.persistence.FileTxnLog
  • org.apache.zookeeper.server.persistence.FileTxnSnapLog
  • org.apache.zookeeper.server.ZKDatabase
  • org.apache.zookeeper.test.LoadFromLogTest
  • org.apache.zookeeper.test.TruncateTest
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