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From Øystein Grøvlen (JIRA) <j...@apache.org>
Subject [jira] Commented: (DERBY-3243) (jdbc net client) exception during normal iteration through "ResultSet" of "select * from t"
Date Tue, 29 Jan 2008 15:13:34 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12563546#action_12563546
] 

Øystein Grøvlen commented on DERBY-3243:
----------------------------------------

I have time to look at the details of this problem today, but I
thought I would write up a few things based on what I remember from
reviewing this work.

I am not sure if it is a good idea, but the locator mapping table is
used for two separate issues:

  1. It used by the network server to store the mapping from locator
     by client to EmbedBlob/EmbedClob.  This is used by stored
     procedures that is called by the client for LOB operations.

  2. It is used by the embedded driver to store references to LOB
     objects that due to their size temporarily spills to disk.  This
     is done so that the temporary files can be cleaned up on
     commit/rollback.

To me it sounds like the item 2. is implemented so that all LOB
objects are stored in the mapping table, not just those that need
clean-up.  (I am guessing, I have not checked the code).  That would
make two entries for every client LOB.

With respect to the wrapping locator generator, I think it should be
possible to reuse locators that have been released.  Hence, one way to
solve this is to start at 0 when it wraps, and iterate until an unused
locator is found.
     
   


> (jdbc net client) exception during normal iteration through "ResultSet" of "select *
from t"
> --------------------------------------------------------------------------------------------
>
>                 Key: DERBY-3243
>                 URL: https://issues.apache.org/jira/browse/DERBY-3243
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC
>    Affects Versions: 10.3.2.1
>         Environment: ------------------ Java Information ------------------
> Java Version:    1.4.2_03
> Java Vendor:     Sun Microsystems Inc.
> Java home:       C:\Programme\Java\j2re1.4.2_03
> Java classpath:  derbyclient.jar
> OS name:         Windows XP
> OS architecture: x86
> OS version:      5.1
> Java user name:  cbdqok
> Java user home:  C:\Dokumente und Einstellungen\cbdqok
> Java user dir:   D:\users\cbdqok\privat\osj\lib_derby_net\lib
> java.specification.name: Java Platform API Specification
> java.specification.version: 1.4
> --------- Derby Information --------
> JRE - JDBC: J2SE 1.4.2 - JDBC 3.0
> [D:\users\cbdqok\privat\osj\lib_derby_net\lib\derbyclient.jar] 10.3.1.4 - (561794)
> ------------------------------------------------------
> ----------------- Locale Information -----------------
> ------------------------------------------------------
>            Reporter: Oliver Seidel
>            Priority: Critical
>         Attachments: derby-3243_fix_double_hashmap_entry_diff.txt, derby-3243_fix_double_hashmap_entry_stat.txt
>
>
> Thanks again to the DERBY developers.
> For my convenience I use the client/server variant of DERBY.  This is where the error
occurs.  I have temporarily alleviated the problem for my case by using the embedded version.
> I'm forced to use outlook and have built a program which siphons the messages into a
derby database (phase 1 -- table has two varchar fields and a clob).  When reading them back
(phase 2 -- simple select of all records in no particular order, all 3 attributes), it has
developed an exception.  This is a result of data volume.  I have reduced the problem to a
single demonstration program.
> This behaviour, and the fact that the error is not a "DERBY Exception", but a proper
exception coming back from the JDBC call, leads me to the diagnosis that it is a derby network
client jdbc problem.
> The problem has been reproduced once by Bryan Pendleton: http://www.nabble.com/IndexOutOfBoundsException-t4926228.html
> I'll try to attach the code "error.java"; it can also be found on: http://www.os10000.net/error.java
> Please use as follows:
> javac -classpath derby.jar:derbynet.jar error.java
> java -cp .:derby.jar:derbynet.jar error
> It will create a directory "test_db" and fill it with approx 120mb data.
> Then you will observe the failure. 
> /* -*- Mode:Java; c-basic-offset:8 -*- */
> // --------------------------------------------------------------------------------
> public class error {
> 	// ------------------------------------------------------------------------
> 	public static final int port = 1527;
> 	public static final String host = "127.0.0.1";
> 	// ------------------------------------------------------------------------
> 	public static void log(String x) { System.out.println(x); };
> 	// ------------------------------------------------------------------------
> 	public static void log_stacktrace(Exception e) {
>                 java.io.StringWriter sw = new java.io.StringWriter();
>                 java.io.PrintWriter pw = new java.io.PrintWriter(sw);
>                 e.printStackTrace(pw);
>                 log(sw.toString());
> 	};
> 	// ------------------------------------------------------------------------
> 	public static void start_server() {
> 		try {
> 			org.apache.derby.drda.NetworkServerControl server =
> 				new org.apache.derby.drda.NetworkServerControl(java.net.InetAddress.getByName(host),port);
> 			server.start(null);
> 			try { java.lang.Thread.sleep(5000); } catch (Exception e) { };
> 			log("started DERBY on host "+host+" port "+Integer.toString(port)+".");
> 		} catch (Exception e) {
> 			log_stacktrace(e);
> 		};
> 	};
> 	// ------------------------------------------------------------------------
> 	public static java.sql.Connection con()
> 		throws java.sql.SQLException, java.lang.ClassNotFoundException {
> 		Class.forName("org.apache.derby.jdbc.ClientDriver");
> 		String x_dbse = "test_db";
> 		String x_user = ";user=os10000";
> 		String x_pass = ";password=ding";
> 		String x_crte = ";create=true";
> 		String x_msgs = ";retrieveMessagesFromServerOnGetMessage=true";
> 		String connect = "jdbc:derby://"+host+":"+port+"/"+x_dbse+x_user+x_crte+x_msgs;
> 		return java.sql.DriverManager.getConnection(connect);
> 	};
> 	// ----------------------------------------------------------------------
> 	public static String getclob(java.sql.Clob b) {
> 		java.io.CharArrayWriter caw = new java.io.CharArrayWriter();
> 		try {
> 			java.io.Reader rd = b.getCharacterStream();
> 			char cb[] = new char[4096];
> 			int off=0, bts = rd.read(cb);
> 			while (bts>0) { caw.write(cb,off,bts); off+=bts; bts=rd.read(cb); };
> 			rd.close();
> 		} catch(Exception e) {};
> 		String res = caw.toString();
> 		caw.close();
> 		return res;
> 	};
> 	// ----------------------------------------------------------------------
> 	public static class myclob implements java.sql.Clob {
> 		String v;
> 		public myclob(String z) { v=z; };
> 		public java.io.InputStream getAsciiStream() { return new java.io.ByteArrayInputStream(v.getBytes());
};
> 		public java.io.Reader getCharacterStream() { return new java.io.CharArrayReader(v.toCharArray());
};
> 		public String getSubString(long pos, int length) { return v.substring((int)pos,(int)(pos+length));
};
> 		public long length() { return v.length(); };
> 		public long position(java.sql.Clob pattern, long start) { return 0; };
> 	        public long position(String pattern, long start) { return 0; };
> 		public java.io.OutputStream setAsciiStream(long pos) {
> 			new java.sql.SQLException("setAsciiStream not implemented."); return null; };
> 		public java.io.Writer setCharacterStream(long pos) {
> 			new java.sql.SQLException("setCharacterStream not implemented."); return null; };
> 		public int setString(long pos, String s) {
> 			new java.sql.SQLException("setString not implemented."); return -1; };
> 		public int setString(long pos, String s, int offset, int len) {
> 			new java.sql.SQLException("setString not implemented."); return -1; };
> 		public void truncate(long len) {
> 			new java.sql.SQLException("truncate not implemented."); };
> 	};
> 	public static java.sql.Clob putclob(String x) { return new myclob(x); };
> 	
> 	// ------------------------------------------------------------------------
> 	public static String getLob(java.sql.ResultSet rs, int arg)
> 		throws java.sql.SQLException { return getclob(rs.getClob(arg)); };
> 	public static void setLob(java.sql.PreparedStatement ps, int arg, String val)
> 		throws java.sql.SQLException { ps.setClob(arg,putclob(val)); };
> 	// ------------------------------------------------------------------------
> 	public static String clean_string(String x) {
> 		return x.replaceAll("[\0\r\\\\]","").replaceAll("'","\\\"").replaceAll(",+",",");
> 	};
> 	// ------------------------------------------------------------------------
> 	public static String make_string(int digits) {
> 		double dl = (Math.random()) * (Math.pow(10.0,digits*Math.random()));
> 		int len = (int) dl;
> 		byte buf[] = new byte[len];
> 		while (len>0) {
> 			double db = 256*Math.random();
> 			buf[--len] = (byte)db;
> 		};
> 		return clean_string(new String(buf));
> 	};
> 	// ------------------------------------------------------------------------
> 	public static void update(java.sql.Connection c, String cmd)
> 		throws java.sql.SQLException {
> 		c.createStatement().execute(cmd);
> 	};
> 	// ------------------------------------------------------------------------
> 	public static final int entries=100000;
> 	public static void fill_db(java.sql.Connection c)
> 		throws java.sql.SQLException {
> 		try { update(c,"drop table mail_raw"); } catch (Exception e) {};
> 		try { update(c,"create table mail_raw ( msg varchar(999), att varchar(100), val clob
)"); } 
> 		catch (Exception e) { log_stacktrace(e); };
> 		java.sql.PreparedStatement pstmt = null;
> 		try { pstmt = c.prepareStatement("insert into mail_raw values ( ?, ?, ? )"); }
> 		catch (Exception e) { log_stacktrace(e); };
> 		for (int i=0; i<entries; i++) {
> 			pstmt.setString(1,make_string(3));
> 			pstmt.setString(2,"5 body");
> 			setLob(pstmt,3,make_string(4));
> 			pstmt.executeUpdate();
> 			if (i%100==0) log("step "+i+"/"+entries);
> 		};
> 	};
> 	// ------------------------------------------------------------------------
> 	public static void dump_db(java.sql.Connection c)
> 		throws java.sql.SQLException {
> 		log("performing dump.");
> 		java.sql.ResultSet rs = c.createStatement().executeQuery("select * from mail_raw");
> 		while (rs.next()) {
> 			String msg = rs.getString(1);
> 			String att = rs.getString(2);
> 			String val = getLob(rs,3);
> 		};
> 	};
> 	// ------------------------------------------------------------------------
> 	public static void main(String args[]) {
> 		start_server();
> 		try {
> 			java.sql.Connection c = con();
> 			fill_db(c);
> 			dump_db(c);
> 		} catch (Exception e) { log_stacktrace(e); };
> 	};
> 	// ------------------------------------------------------------------------
> };

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