Re: [HTCondor-users] condor_history with named pipes w/o seek?

[Carsten Aulbert <carsten.aulbert@xxxxxxxxxx>]

Hi

On 14.10.21 12:01, Thomas Hartmann wrote:
> Probably condor_history is doing a seek - which probably does not really 
> harmonize with the pipe's stream, or?

it does as

strace -f condor_history -file <(zcat history.gz)

ends with

openat(AT_FDCWD, "/proc/self/fd/11", O_RDONLY) = 3
fcntl(3, F_GETFL)                       = 0x8000 (flags 
O_RDONLY|O_LARGEFILE)
fstat(3, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
fstat(3, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
lseek(3, 0, SEEK_END)                   = -1 ESPIPE (Illegal seek)
lseek(3, 0, SEEK_CUR)                   = -1 ESPIPE (Illegal seek)
lseek(3, -4096, SEEK_SET)               = -1 ESPIPE (Illegal seek)
lseek(3, 0, SEEK_SET)                   = -1 ESPIPE (Illegal seek)
close(3)                                = 0

unfortunately, I don't know of any method to make named pipes seek-able 
or condor_history work on compressed files :(

Just uncompress to /dev/shm, work on it and remove it again?

Sorry, for not being really helpful

Carsten
--
Dr. Carsten Aulbert, Max Planck Institute for Gravitational Physics,
CallinstraÃe 38, 30167 Hannover, Germany, Phone +49 511 762 17185

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