[Gluster-users] Extra line of ^@^@^@ at the end of the file

[Patrice Linel]

Hi all,

When running a program on a distribute volume with sharding, sometimes
the files get created with an extra line of special characters ^@^@^@ at
the end. This happen under load with multiple nodes access the same
folders with job creating files and reading them very shortly on another
node (>0.5 sec later).
I did an strace and the major difference is an Inappropriate ioctl
followed by an lseek like below.


When running the same workload on a panfs filesystem , the strace is the
same but no extra line get created at the end.


Thanks for any advice on further debugging or resolution on this.

Patrice.


ioctl(1, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS,
{B38400 opost isig icanon echo ...}) = 0
fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 32), ...}) = 0
readlink("/proc/self/fd/1", "/dev/pts/32", 4095) = 11
stat("/dev/pts/32", {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 32),
...}) = 0
ioctl(1, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS,
{B38400 opost isig icanon echo ...}) = 0
fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 32), ...}) = 0
ioctl(1, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS,
{B38400 opost isig icanon echo ...}) = 0
write(1, " Done reading parameter file for"..., 57) = 57


VS

ioctl(1, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS,
0x7fffffff6410) = -1 ENOTTY (Inappropriate ioctl for device)
ioctl(1, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS,
0x7fffffffa630) = -1 ENOTTY (Inappropriate ioctl for device)
fstat(1, {st_mode=S_IFREG|0664, st_size=22753, ...}) = 0
ioctl(1, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS,
0x7fffffffa630) = -1 ENOTTY (Inappropriate ioctl for device)
write(1, " Done reading parameter file for"..., 57 Done reading
parameter file for chromosome            7
) = 57
lseek(1, 0, SEEK_CUR^@^@^@^@^@^@^@^@^@^@^@^@^@)


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