Hi
I'm attempting to checkpoint a Java application. I'm using "dmtcp_launch
--ckpt-open-files java -jar ..." to start the application and setting the
checkpoint directory to a networked file system.
Everything seems to work as expected, but restarts are failing:
$ /scratch/dmtcp_restart_script.sh
dmtcp_coordinator starting...
Host: ****** (***.***.***.***)
Port: 7779
Checkpoint Interval: disabled (checkpoint manually instead)
Exit on last client: 1
Backgrounding...
[22895] mtcp_restart.c:1248 read_shared_memory_area_from_file:
mapping current version of /app/BEAST/1.8.2/lib/beast.jar into memory;
_not_ file as it existed at time of checkpoint.
(Or this may be a file shared by multiple processes.)
Change mtcp_restart.c:1248 and re-compile, if you want different behavior.
[40000] ERROR at fileconnection.cpp:943 in areFilesEqual;
REASON='JASSERT(Util::readAll(fd, buf2, readBytes) == readBytes) failed'
java (40000): Terminating...
It seems very similar to an issue reported here:
http://sourceforge.net/p/dmtcp/mailman/message/32939254/
I have tried the patch attached in final update to that. Restart still
fails, but the message changes:
$ dmtcp_restart_script.sh
dmtcp_coordinator starting...
Host: ****** (***.***.***.***)
Port: 7779
Checkpoint Interval: disabled (checkpoint manually instead)
Exit on last client: 1
Backgrounding...
[23895] mtcp_restart.c:1248 read_shared_memory_area_from_file:
mapping current version of /app/BEAST/1.8.2/lib/beast.jar into memory;
_not_ file as it existed at time of checkpoint.
(Or this may be a file shared by multiple processes.)
Change mtcp_restart.c:1248 and re-compile, if you want different behavior.
[40000] ERROR at fileconnection.cpp:985 in writeFileFromFd;
REASON='JASSERT(_real_lseek(fd, 0, SEEK_SET) == 0) failed'
fd = -1
(strerror((*__errno_location ()))) = Bad file descriptor
java (40000): Terminating...
Without checkpointing files the restart works fine. Regrettably, I need to
have those files checkpointed. Any advice would be appreciated.
Thanks
Michael
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