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From "ori (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DBCP-244) Connection socket hangs sporadically in DBCP 1.2.2 but not 1.2.1
Date Wed, 05 Mar 2008 17:51:41 GMT

    [ https://issues.apache.org/jira/browse/DBCP-244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12575434#action_12575434
] 

ori commented on DBCP-244:
--------------------------

Phil,

In response to your suggestion on Feb 1 2008, I can now confirm that this is not the case.

All connections were obtained using the code below. The exception was thrown later on a SELECT
query.

public static Connection getConnection()
        throws SQLException
    {
        Connection conn = dataSource.getConnection();
        conn.setAutoCommit(true);
        return conn;
    }

--

Caused by: com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying
exception:

** BEGIN NESTED EXCEPTION **

java.net.SocketTimeoutException
MESSAGE: Read timed out

STACKTRACE:

java.net.SocketTimeoutException: Read timed out
       at java.net.SocketInputStream.socketRead0(Native Method)
       at java.net.SocketInputStream.read(SocketInputStream.java:129)
       at com.mysql.jdbc.util.ReadAheadInputStream.fill(ReadAheadInputStream.java:113)
       at com.mysql.jdbc.util.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:160)
       at com.mysql.jdbc.util.ReadAheadInputStream.read(ReadAheadInputStream.java:188)
       at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1994)
       at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2464)
       at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2916)
       at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:885)
       at com.mysql.jdbc.MysqlIO.nextRow(MysqlIO.java:1360)
       at com.mysql.jdbc.MysqlIO.readSingleRowSet(MysqlIO.java:2369)
       at com.mysql.jdbc.MysqlIO.getResultSet(MysqlIO.java:451)
       at com.mysql.jdbc.MysqlIO.readResultsForQueryOrUpdate(MysqlIO.java:2076)
       at com.mysql.jdbc.MysqlIO.readAllResults(MysqlIO.java:1451)
       at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1787)
       at com.mysql.jdbc.Connection.execSQL(Connection.java:3256)
       at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1313)
       at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1448)
       at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:93)
... 
[my application code]

> Connection socket hangs sporadically in DBCP 1.2.2 but not 1.2.1
> ----------------------------------------------------------------
>
>                 Key: DBCP-244
>                 URL: https://issues.apache.org/jira/browse/DBCP-244
>             Project: Commons Dbcp
>          Issue Type: Bug
>    Affects Versions: 1.2.2
>         Environment: Fedora Core 3, MySQL 4.1.22. with the latest driver (5.07). Exceptions
only occur in the "job processing" JVM, which sits idle for long periods of time and occasionally
wakes up to interact with the database.
>            Reporter: ori
>             Fix For: 1.3
>
>
> I think I've traced an exception to DBCP's code.
> Communication with the database is hanging sporadically in a production environment.
If I don't set the socketTimeout property on the underlying connection, it will hang forever.
With the socketTimeout property, I get the following exception:
> -------
> com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying
exception:
> ** BEGIN NESTED EXCEPTION **
> java.net.SocketTimeoutException
> MESSAGE: Read timed out
> STACKTRACE:
> java.net.SocketTimeoutException: Read timed out
>        at java.net.SocketInputStream.socketRead0(Native Method)
>        at java.net.SocketInputStream.read(SocketInputStream.java:129)
>        at com.mysql.jdbc.util.ReadAheadInputStream.fill(ReadAheadInputStream.java:113)
>        at com.mysql.jdbc.util.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:160)
>        at com.mysql.jdbc.util.ReadAheadInputStream.read(ReadAheadInputStream.java:188)
>        at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1994)
>        at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2411)
>        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2916)
>        at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1631)
>        at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1723)
>        at com.mysql.jdbc.Connection.execSQL(Connection.java:3250)
>        at com.mysql.jdbc.Statement.executeUpdate(Statement.java:1355)
>        at com.mysql.jdbc.Statement.executeUpdate(Statement.java:1270)
>        at org.apache.commons.dbcp.DelegatingStatement.executeUpdate(DelegatingStatement.java:228)
> ...
> -------
> It always happens in an infrequently used JVM (not an app server handling frequent connections).
So it's likely the offending connection was asleep for a long time before the exception occurs.

> I've confirmed that this issue only occurs using 1.2.2 and not 1.2.1. I've been looking
through the changelogs but can't find anything that would cause this behavior.
> Does somebody familiar with the codebase have any idea what change (1.2.1->1.2.2)
could be causing this behavior? 
> Thanks

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