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From André Oriani (JIRA) <j...@apache.org>
Subject [jira] Created: (ZOOKEEPER-825) Opening a ledger for reading causes an implicit close of ledger that is not deteced by write
Date Tue, 20 Jul 2010 03:42:49 GMT
Opening a ledger for reading causes an implicit close of ledger that is not deteced by write

---------------------------------------------------------------------------------------------

                 Key: ZOOKEEPER-825
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-825
             Project: Zookeeper
          Issue Type: Bug
          Components: contrib-bookkeeper
    Affects Versions: 3.3.1
            Reporter: André Oriani


Quoting the reply of Benjamin Reed to one of my emails
{quote}
there is one other bug you are seeing, before a ledger can be read, it must be closed. as
your code shows, a process can open a ledger for reading while it is still being written to,
which causes an implicit close that is not detected by the writer.
{quote}


Teste Case :

{code}
package br.unicamp.zooexp.booexp;

import java.io.IOException;
import java.util.Enumeration;

import org.apache.bookkeeper.client.BKException;
import org.apache.bookkeeper.client.BookKeeper;
import org.apache.bookkeeper.client.LedgerEntry;
import org.apache.bookkeeper.client.LedgerHandle;
import org.apache.bookkeeper.client.BookKeeper.DigestType;
import org.apache.zookeeper.KeeperException;

public class BookTest {

    public static void main (String ... args) throws IOException, InterruptedException, KeeperException,
BKException{
        BookKeeper bk = new BookKeeper("127.0.0.1");
        LedgerHandle lh = bk.createLedger(DigestType.CRC32, "123".getBytes());
        long lh_id = lh.getId();
        lh.addEntry("Teste".getBytes());
        lh.addEntry("Test2".getBytes());
        System.out.printf("Got %d entries for lh\n",lh.getLastAddConfirmed()+1);



        lh.addEntry("Test3".getBytes());
        LedgerHandle lh1 = bk.openLedger(lh_id, DigestType.CRC32, "123".getBytes());
        System.out.printf("Got %d entries for lh1\n",lh1.getLastAddConfirmed()+1);
        lh.addEntry("Test4".getBytes());

        lh.addEntry("Test5".getBytes());
        lh.addEntry("Test6".getBytes());
        System.out.printf("Got %d entries for lh\n",lh.getLastAddConfirmed()+1);
        Enumeration<LedgerEntry> seq = lh.readEntries(0, lh.getLastAddConfirmed());
        while (seq.hasMoreElements()){
            System.out.println(new String(seq.nextElement().getEntry()));
        }
        lh.close();


        lh1.addEntry("Test7".getBytes());
        lh1.addEntry("Test8".getBytes());

        System.out.printf("Got %d entries for lh1\n",lh1.getLastAddConfirmed()+1);

        seq = lh1.readEntries(0, lh1.getLastAddConfirmed());
        while (seq.hasMoreElements()){
            System.out.println(new String(seq.nextElement().getEntry()));
        }


        lh1.close();

        LedgerHandle lh2 = bk.openLedger(lh_id, DigestType.CRC32, "123".getBytes());
        lh2.addEntry("Test9".getBytes());

        System.out.printf("Got %d entries for lh2 \n",lh2.getLastAddConfirmed()+1);

        seq = lh2.readEntries(0, lh2.getLastAddConfirmed());
        while (seq.hasMoreElements()){
            System.out.println(new String(seq.nextElement().getEntry()));
        }

        bk.halt();

    }
}

{code}


{panel:title=Output}
Got 2 entries for lh
Got 3 entries for lh1
Got 6 entries for lh
Teste
Test2
Test3
Test4
Test5
Test6
Got 3 entries for lh1
Teste
Test2
Test3
Got 3 entries for lh2 
Teste
Test2
Test3
{panel}

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