Submit jobs to run in background using Perl -


this question has answer here:

i have perl script submitting hadoop command run in background, in while loop each record in input file. scenario , have fire hadoop commands unix , make run background, not wait background process finish , go next record in input file , fire next one. code below submits hadoop command in background , waits complete dont want to.

open(my $data, '<', $file) or die "could not open '$file' $!\n";  while (my $line = <$data>) {   chomp $line;   @fields = split "," , $line;   if( $fields[7] == 'y' ) { `nohup sqoop export --connect "jdbc:sqlserver://sqlserver:1433;database=$fields[0];user=sa;password=pwd" --table $fields[2] --export-dir $src_dir --input-fields-terminated-by '$fields[3]' --input-lines-terminated-by '$fields[4]' --m $fields[5] --staging-table $fields[6] --clear-staging-table --batch > $tgt_dir/$fields[2].out & `; echo $! > $pid_file; }  else {    next; } }

please let me know how can it..

also,the hadoop command can run more few minutes. have make script wait background commands ,with of pid, fired , give report based on stdout files hadoop commands.

need on how accomplish this....

i think problem nohup [command] & inside perl isn't working intended. see here (something stdout. echo should inside backticks).

for example:

perl -e 'say `nohup sleep 30 & echo \$! > foo.pid &`'

does not run in background me.

but:

perl -e 'say `nohup sleep 30 > /dev/null & echo \$! > foo.pid`'

will work. having said comments saying should google more background processes in perl warranted. using fork() (or cpan module using it) , managing child processes there.


Comments

Post a Comment

Popular posts from this blog

php - failed to open stream: HTTP request failed! HTTP/1.0 400 Bad Request -

this code i'm using find latitude , longitude of place: function coords($address){ echo $url="http://maps.googleapis.com/maps/api/geocode/json?address=".$address; $json = file_get_contents(urlencode($url)); $data = json_decode($json, true); print_r($data['results'][0]['geometry']['location']['lat']); print_r($data['results'][0]['geometry']['location']['lng']); } however returns warning: failed open stream: http request failed! http/1.0 400 bad request if use above code in simple procedure works fine not in function. note: have tried curl_init()... method produced same result? instead of encoding whole url encode address part. following code work fine $add='jamshoro phase 2'; $url="http://maps.googleapis.com/maps/api/geocode/json?address=".urlencode($add); $json = file_get_contents($url); $data = json_decode($json, true); print_r($data['r
Read more

java - How to filter a backspace keyboard input -

i have code gives message when key number pressed: txtvalueofclause.addeventfilter(keyevent.key_typed, new eventhandler<keyevent>() { @override public void handle(keyevent t) { char ar[] = t.getcharacter().tochararray(); char ch = ar[t.getcharacter().tochararray().length - 1]; if (!(ch >= '0' && ch <= '9')) { system.out.println("the char entered not number"); t.consume(); } } }); now if press on wrong button , press backspace remove it, error message. how can add backspace input if statement? i have found answer: txtvalueofclause.addeventfilter(keyevent.key_typed, new eventhandler<keyevent>() { @override public void handle(keyevent t) { char ar[] = t.getcharacter().tochararray(); char ch = ar[t.getcharacter().tochar
Read more

java - Show Soft Keyboard when EditText Appears -

i have code in android app, alert dialog , keyboard, , when dialog shown want keyboard appear. not , not sure why? here code: final alertdialog.builder alert = new alertdialog.builder(this); alert.settitle("title"); alert.setmessage("message"); final edittext input = new edittext(this); input.setinputtype(inputtype.type_class_number); alert.setview(input); input.setonfocuschangelistener(new view.onfocuschangelistener() { @override public void onfocuschange(view v, boolean hasfocus) { if (hasfocus) { log.i(tag, "in focus"); inputmethodmanager inputmethodmanager = (inputmethodmanager) getsystemservice(context.input_method_service); inputmethodmanager.showsoftinput(input, inputmethodmanager.show_implicit); } } }); but keyboard not appear though edit text in focus, , tell appear why, doesn't come up? thanks in advance.
Read more