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

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

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                logFile = file;
                corruptFile(logFile);
            }
        }
        FileTxnLog flog = new FileTxnLog(versionDir);
        TxnIterator itr = flog.read(1);
        //we will get a checksum failure
        try {
            while (itr.next()) {
            }
            Assert.assertTrue(false);
        } catch(IOException ie) {
            LOG.info("crc corruption", ie);
        }
        itr.close();
        // find the last snapshot
        FileSnap snap = new FileSnap(versionDir);
        List<File> snapFiles = snap.findNRecentSnapshots(2);
        snapFile = snapFiles.get(0);
        corruptFile(snapFile);
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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);
        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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        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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     */
    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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     */
    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);
        long highestZxid = dt.lastProcessedZxid;
        TxnHeader hdr;
        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(highestZxid + "(higestZxid) > "
                        + hdr.getZxid() + "(next log) for type "
                        + hdr.getType());
            } else {
                highestZxid = hdr.getZxid();
            }
            processTransaction(hdr,dt,sessions, itr.getTxn());
            if (!itr.next())
                break;
        }
        return highestZxid;
    }
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                logFile = file;
                corruptFile(logFile);
            }
        }
        FileTxnLog flog = new FileTxnLog(versionDir);
        TxnIterator itr = flog.read(1);
        //we will get a checksum failure
        try {
            while (itr.next()) {
            }
            assertTrue(false);
        } catch(IOException ie) {
            LOG.info("crc corruption", ie);
        }
        itr.close();
        // find the last snapshot
        FileSnap snap = new FileSnap(versionDir);
        snapFile = snap.findMostRecentSnapshot();
        // corrupt this file
        corruptFile(snapFile);
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                logFile = file;
                corruptFile(logFile);
            }
        }
        FileTxnLog flog = new FileTxnLog(versionDir);
        TxnIterator itr = flog.read(1);
        //we will get a checksum failure
        try {
            while (itr.next()) {
            }
            assertTrue(false);
        } catch(IOException ie) {
            LOG.info("crc corruption", ie);
        }
        itr.close();
        // find the last snapshot
        FileSnap snap = new FileSnap(versionDir);
        List<File> snapFiles = snap.findNRecentSnapshots(2);
        snapFile = snapFiles.get(0);
        corruptFile(snapFile);
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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);
        long highestZxid = dt.lastProcessedZxid;
        TxnHeader hdr;
        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(highestZxid + "(higestZxid) > "
                        + hdr.getZxid() + "(next log) for type "
                        + hdr.getType());
            } else {
                highestZxid = hdr.getZxid();
            }
            processTransaction(hdr,dt,sessions, itr.getTxn());
            if (!itr.next())
                break;
        }
        return highestZxid;
    }
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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;
        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(highestZxid + "(higestZxid) > "
                        + hdr.getZxid() + "(next log) for type "
                        + 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());
            }
            listener.onTxnLoaded(hdr, itr.getTxn());
            if (!itr.next())
                break;
        }
        return highestZxid;
    }
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        if (sizeLimit < 0) {
            LOG.debug("Negative size limit - retrieving proposal via txnlog is disabled");
            return TxnLogProposalIterator.EMPTY_ITERATOR;
        }

        TxnIterator itr = null;
        try {

            itr = snapLog.readTxnLog(startZxid, false);

            // If we cannot guarantee that this is strictly the starting txn
            // after a given zxid, we should fail.
            if ((itr.getHeader() != null)
                    && (itr.getHeader().getZxid() > startZxid)) {
                LOG.warn("Unable to find proposals from txnlog for zxid: "
                        + startZxid);
                itr.close();
                return TxnLogProposalIterator.EMPTY_ITERATOR;
            }

            if (sizeLimit > 0) {
                long txnSize = itr.getStorageSize();
                if (txnSize > sizeLimit) {
                    LOG.info("Txnlog size: " + txnSize + " exceeds sizeLimit: "
                            + sizeLimit);
                    itr.close();
                    return TxnLogProposalIterator.EMPTY_ITERATOR;
                }
            }
        } catch (IOException e) {
            LOG.error("Unable to read txnlog from disk", e);
            try {
                if (itr != null) {
                    itr.close();
                }
            } catch (IOException ioe) {
                LOG.warn("Error closing file iterator", ioe);
            }
            return TxnLogProposalIterator.EMPTY_ITERATOR;
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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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