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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2026) Setting a login timeout in client driver can lead to query timeout
Date Wed, 11 Aug 2010 20:37:17 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12897438#action_12897438
] 

Kathey Marsden commented on DERBY-2026:
---------------------------------------

DriverManager is pretty vague, but I am getting pretty confused on the various timeout options
in DataSources and Sockets. For DataSource I see:

setLoginTimeout
 A value of zero specifies that the timeout is the default system timeout if there is one;
otherwise, it specifies that there is no timeout. When a DataSource object is created, the
login timeout is initially zero.

On Socket setSoTimout I see:
The timeout must be > 0. A timeout of zero is interpreted as an infinite timeout. 

So I guess according to spec with  setLoginTimeout set, after we make the connection, it should
restore things to the system default, not call setSoTimeout(0) to make it infinite but I don't
actually see an option to do that with setSoTimeout on the socket.  

Furthermore, I have a report from a user using the existing code that is seeing timeouts on
queries after calling setLoginTimeout(0) which I think should change things to an 
infinite timeout but does not appear to be doing so.  Of course if that is the case, neither
Mamta's fix nor restoring to the default after the connection would help them.  

Sorry for the rambling. I will do some experiments on my machine and hopefully get access
to the user's to try and  understand all this better.   Any comments of pearls of wisdom in
this area are welcome.




> Setting a login timeout in client driver can lead to query timeout
> ------------------------------------------------------------------
>
>                 Key: DERBY-2026
>                 URL: https://issues.apache.org/jira/browse/DERBY-2026
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC, Network Client
>    Affects Versions: 10.3.1.4
>         Environment: Client driver on most platforms
>            Reporter: Olav Sandstaa
>            Assignee: Mamta A. Satoor
>            Priority: Minor
>         Attachments: DERBY2026_LoginTimeout_diff_patch1.txt, LoginTimeout.java
>
>
> Setting the login timeout by using DriverManager.setLoginTimeout(int
> seconds) also affects the amount of time the client driver is waiting
> for a query to finish. For instance, setting the login timeout to 10
> seconds will result in any queries taking more than 10 seconds to fail
> with the following exception:
> Exception thrown: java.sql.SQLException: A communications error has been detected: Read
timed out.
> java.sql.SQLException: A communications error has been detected: Read timed out.
>         at org.apache.derby.client.am.SQLExceptionFactory.getSQLException(SQLExceptionFactory.java:46)
>         at org.apache.derby.client.am.SqlException.getSQLException(SqlException.java:345)
>         at org.apache.derby.client.am.Statement.executeQuery(Statement.java:414)
>         at LoginTimeout.main(LoginTimeout.java:53)
> Caused by: org.apache.derby.client.am.DisconnectException: A communications error has
been detected: Read timed out.
>         at org.apache.derby.client.net.NetAgent.throwCommunicationsFailure(NetAgent.java:408)
>         at org.apache.derby.client.net.Reply.fill(Reply.java:176)
>         at org.apache.derby.client.net.Reply.ensureALayerDataInBuffer(Reply.java:215)
>         at org.apache.derby.client.net.Reply.readDssHeader(Reply.java:317)
>         at org.apache.derby.client.net.Reply.startSameIdChainParse(Reply.java:1147)
>         at org.apache.derby.client.net.NetStatementReply.readPrepareDescribeOutput(NetStatementReply.java:51)
>         at org.apache.derby.client.net.StatementReply.readPrepareDescribeOutput(StatementReply.java:40)
>         at org.apache.derby.client.net.NetStatement.readPrepareDescribeOutput_(NetStatement.java:139)
>         at org.apache.derby.client.am.Statement.readPrepareDescribeOutput(Statement.java:1341)
>         at org.apache.derby.client.am.Statement.flowExecute(Statement.java:1977)
>         at org.apache.derby.client.am.Statement.executeQueryX(Statement.java:420)
>         at org.apache.derby.client.am.Statement.executeQuery(Statement.java:405)
>         ... 1 more
> Caused by: java.net.SocketTimeoutException: Read timed out
>         at java.net.SocketInputStream.socketRead0(Native Method)
>         at java.net.SocketInputStream.read(SocketInputStream.java:129)
>         at org.apache.derby.client.net.Reply.fill(Reply.java:174)
>         ... 11 more

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