exception while collecting data java.io.IOException: Read failed, file xyz not mapped for I/O

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Long time production application running 
2. Some "Out of disk space errors" 

What is the expected output? What do you see instead?

No warning and no 'empty' files, I can see this warnings, and referenced files 
are 0 length
ls -l 
-rw-r--r-- 1 tomcat users 0 2011-09-07 11:30 
temp/javamelody/_XYZ.xyz/http61d116e9f3af92c3c4e2a211cf5c80b3987ad0e6.rrd

21 Sep 2011 10:14:29 [javamelody] [] WARN  javamelody      - exception while 
collecting data
java.io.IOException: Read failed, file 
temp/javamelody/_xyz.xyz/http61d116e9f3af92c3c4e2a211cf5c80b3987ad0e6.rrd not 
mapped for I/O
        at org.jrobin.core.RrdNioBackend.read(RrdNioBackend.java:132)
 .................................

What version of the product are you using? On what application server, JDK,
operating system?
Using JavaMelody 1.26.0 
OS:     OS Linux unknown, amd64/64 (8 cores)
Java:   Java(TM) SE Runtime Environment, 1.6.0_23-b05
JVM:    Java HotSpot(TM) 64-Bit Server VM, 19.0-b09, mixed mode
Server:     Server Apache Tomcat/6.0.32 


Please provide any additional information below.

StackTrace:
21 Sep 2011 10:14:29 [javamelody] [] WARN  javamelody      - exception while 
collecting data
java.io.IOException: Read failed, file 
temp/javamelody/_xyz.xyz/http61d116e9f3af92c3c4e2a211cf5c80b3987ad0e6.rrd not 
mapped for I/O
        at org.jrobin.core.RrdNioBackend.read(RrdNioBackend.java:132)
        at org.jrobin.core.RrdBackend.readString(RrdBackend.java:258)
        at org.jrobin.core.RrdPrimitive.readString(RrdPrimitive.java:107)
        at org.jrobin.core.RrdString.get(RrdString.java:53)
        at org.jrobin.core.Header.isJRobinHeader(Header.java:199)
        at org.jrobin.core.Header.validateHeader(Header.java:203)
        at org.jrobin.core.RrdDb.<init>(RrdDb.java:233)
        at org.jrobin.core.RrdDb.<init>(RrdDb.java:203)
        at org.jrobin.core.RrdDb.<init>(RrdDb.java:266)
        at org.jrobin.core.RrdDbPool.requestRrdDb(RrdDbPool.java:103)
        at net.bull.javamelody.JRobin.addValue(JRobin.java:294)
        at net.bull.javamelody.Collector.collectCounterRequestData(Collector.java:619)
        at net.bull.javamelody.Collector.collectCounterRequestsAndErrorsData(Collector.java:579)
        at net.bull.javamelody.Collector.collectCounterData(Collector.java:556)
        at net.bull.javamelody.Collector.collect(Collector.java:267)
        at net.bull.javamelody.Collector.collectWithoutErrors(Collector.java:242)
        at net.bull.javamelody.Collector.collectLocalContextWithoutErrors(Collector.java:232)
        at net.bull.javamelody.FilterContext$CollectTimerTask.run(FilterContext.java:52)
        at java.util.TimerThread.mainLoop(Timer.java:512)
        at java.util.TimerThread.run(Timer.java:462)

Original issue reported on code.google.com by nico.go...@codeoscopic.com on 21 Sep 2011 at 10:17

[GoogleCodeExporter]

Thanks for the issue.
Now, when javamelody opens a file which has a length of 0, it will recreate the 
file.
It is fixed and committed in trunk of svn (revision 2143) and ready for the 
next release (1.32).

If you want to try it, I have made a new build from the current trunk and it is 
available at:
http://javamelody.googlecode.com/files/javamelody-20110925.jar

Otherwise you could simply delete the 0 length files. The files will then be 
created correctly if you have enough space.

Original comment by evernat@free.fr on 25 Sep 2011 at 2:59

• Changed state: Fixed

[GoogleCodeExporter]

I have faced the same issue and the workaround resolved this issue. Command to 
delete 0 length RRD

find -maxdepth 1 -type f -size 0 -print0 | xargs -0 rm -f

I am going to upgrade javameloody to latest soon

Original comment by siva.b...@gmail.com on 30 May 2012 at 11:17