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Posted to derby-user@db.apache.org by Pavel Bortnovskiy <PB...@Jefferies.com> on 2010/08/02 21:49:23 UTC
Socket Closed Exception when pinging NetworkServerControl
Hello:
I am getting intermittent (rare, but causing fatal shutdown) exceptions
when pinging NetworkServerControl:
2010-08-02 15:31:25,491 [ApacheDerbyServer] INFO
components.DerbyServerComponent - 2010-08-02 19:31:25.491 GMT : Error on
client socket:Socket closed
2010-08-02 15:31:25,492 [ApacheDerbyServer] INFO
components.DerbyServerComponent - 2010-08-02 19:31:25.492 GMT : Socket
closed
2010-08-02 15:31:25,492 [ApacheDerbyServer] INFO
components.DerbyServerComponent - java.net.SocketException: Socket closed
2010-08-02 15:31:25,492 [ApacheDerbyServer] INFO
components.DerbyServerComponent - at
java.net.SocketInputStream.socketRead0(Native Method)
2010-08-02 15:31:25,493 [ApacheDerbyServer] INFO
components.DerbyServerComponent - at
java.net.SocketInputStream.read(SocketInputStream.java:129)
2010-08-02 15:31:25,493 [ApacheDerbyServer] INFO
components.DerbyServerComponent - at
java.net.SocketInputStream.read(SocketInputStream.java:90)
2010-08-02 15:31:25,493 [ApacheDerbyServer] INFO
components.DerbyServerComponent - at
org.apache.derby.impl.drda.NetworkServerControlImpl.fillReplyBuffer(Unknown
Source)
2010-08-02 15:31:25,494 [ApacheDerbyServer] INFO
components.DerbyServerComponent - at
org.apache.derby.impl.drda.NetworkServerControlImpl.readResult(Unknown
Source)
2010-08-02 15:31:25,494 [ApacheDerbyServer] INFO
components.DerbyServerComponent - at
org.apache.derby.impl.drda.NetworkServerControlImpl.pingWithNoOpen(Unknown
Source)
2010-08-02 15:31:25,494 [ApacheDerbyServer] INFO
components.DerbyServerComponent - at
org.apache.derby.impl.drda.NetworkServerControlImpl.ping(Unknown Source)
2010-08-02 15:31:25,495 [ApacheDerbyServer] INFO
components.DerbyServerComponent - at
org.apache.derby.drda.NetworkServerControl.ping(Unknown Source)
2010-08-02 15:31:25,495 [ApacheDerbyServer] INFO
components.DerbyServerComponent - at
com.jefco.fi.geni.components.DerbyServerComponent.run(DerbyServerComponent.java:142)
2010-08-02 15:31:25,495 [ApacheDerbyServer] INFO
components.DerbyServerComponent - at
java.lang.Thread.run(Thread.java:619)
2010-08-02 15:31:25,496 [ApacheDerbyServer] ERROR
components.DerbyServerComponent - Error while pinging
NetworkServerControl:
java.net.SocketException: Socket closed
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at java.net.SocketInputStream.read(SocketInputStream.java:90)
at
org.apache.derby.impl.drda.NetworkServerControlImpl.fillReplyBuffer(Unknown
Source)
at
org.apache.derby.impl.drda.NetworkServerControlImpl.readResult(Unknown
Source)
at
org.apache.derby.impl.drda.NetworkServerControlImpl.pingWithNoOpen(Unknown
Source)
at
org.apache.derby.impl.drda.NetworkServerControlImpl.ping(Unknown Source)
at org.apache.derby.drda.NetworkServerControl.ping(Unknown Source)
My code pings the NSC in two places - there is one thread which implements
run() method like this:
final public void run() {
final Thread currentThread = Thread.currentThread();
try {
m_server = new NetworkServerControl(m_host, m_port);
m_server.start(new PrintWriter(new LoggingOutputStream(logger,
Level.INFO), true));
try {
while (m_thread == currentThread) {
try {
Thread.sleep(m_sleep);
if (logger.isTraceEnabled()) {
logger.trace("Pinging NetworkServerControl on
[" + m_host + ":" + m_port + "]");
}
---> m_server.ping(); <--- Exception Thrown
} catch (InterruptedException e) {
logger.info(toString() + " sleep has been
interrupted");
}
}
} catch (Exception e) {
logger.error("Error while pinging NetworkServerControl:",
e);
}
logger.info("Stopping NetworkServerControl on [" + m_host +
":" + m_port + "]");
m_server.shutdown();
} catch (Exception e) {
logger.error("Error while starting/stopping
NetworkServerControl:", e);
}
}
And another "validating" thread calls this method at regular intervals:
final public String isRuntimeValid() {
final StringBuilder builder = new StringBuilder();
builder.append(super.isRuntimeValid());
if (m_server == null) builder.append("\n\t").append("Server is
null");
if (m_thread == null) builder.append("\n\t").append("Thread is
null");
try {
m_server.ping();
} catch (Exception e) {
builder.append("\n\t").append("Server cannot be pinged");
}
return builder.toString();
}
Can there be any problem if those two are called at around the same time?
This is probably the only scenario which could, I imagine, cause a
problem...
Would anyone have any other thoughts or suspicions?
Much appreciated,
Pavel.
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