We are developing our own tailer now, but I want to find out what happened with gnu tail or oracle java.
On Feb 8, 2013, at 10:03 PM, Cryptographrix <[email protected]> wrote: > I do not know what limitations STDIN has on it in java offhand, but it sounds > like this is what you are trying to do: > > http://www.informit.com/guides/content.aspx?g=java&seqNum=226 > > > > > On Thu, Feb 7, 2013 at 11:52 PM, Liu Haifeng <[email protected]> wrote: > Hi > > I have a log transport agent written in java which creates a sub process that > executing "tail -F a.log" to tail log file,and the output is piped to the > main java process,thus I can read and transport log content using java. > > This worked fine in the past 30 days,but now it seams the java process can't > read any data. I checked java thread stack, it's blocked on > Java.io.FileInputStream.readBytes. > > The log file I am tailing is rotated every one hour,and the fault happened at > the moment the rotating script is supposed to run. > > Currently I have no idea about this fault. Here following by some status of > the tail process, not more as I don't have the root privilege. > > #cat /proc/28195/status > > Name: tail > State: S (sleeping) > SleepAVG: 78% > Tgid: 28195 > Pid: 28195 > PPid: 28143 > TracerPid: 0 > Uid: 0 0 0 0 > Gid: 0 0 0 0 > FDSize: 256 > Groups: 0 1 2 3 4 6 10 > VmPeak: 3828 kB > VmSize: 3828 kB > VmLck: 0 kB > VmHWM: 524 kB > VmRSS: 524 kB > VmData: 180 kB > VmStk: 88 kB > VmExe: 36 kB > VmLib: 1468 kB > VmPTE: 36 kB > StaBrk: 198b3000 kB > Brk: 198d4000 kB > StaStk: 7fff7679c1d0 kB > Threads: 1 > SigQ: 0/32768 > SigPnd: 0000000000000000 > ShdPnd: 0000000000000000 > SigBlk: 0000000000000004 > SigIgn: 0000000000000003 > SigCgt: 0000000000000000 > CapInh: 0000000000000000 > CapPrm: 00000000fffffeff > CapEff: 00000000fffffeff > Cpus_allowed: > 00000000,00000000,00000000,00000000,00000000,00000000,ffffffff,ffffffff > Mems_allowed: 00000000,00000001 > > #cat /proc/28195/stat > 28195 (tail) S 28143 28138 27881 0 -14202496 141 0 1 0 10328 53939 0 0 18 0 1 > 0 214643641 3919872 131 18446744073709551615 1 1 0 0 0 0 4 3 0 > 18446744073709551615 0 0 17 2 0 0 1 > > #yum list|grep coreutils > coreutils.x86_64 5.97-34.el5_8.1 > installed > policycoreutils.x86_64 1.33.12-14.8.el5 > installed > policycoreutils-gui.x86_64 1.33.12-14.8.el5 base > policycoreutils-newrole.x86_64 1.33.12-14.8.el5 base > > >
