java - JNI application hanging -


please how approach debugging jni application.

used jps pid of process that's running jvm:

$ jps 8248                <- pid of process span c++ application run jni stuff ...  8335 jps

now can attach gdb stack.

$ gdb -p 8248 gnu gdb (gdb) red hat enterprise linux 7.6.1-94.el7 ....  /cut/    (gdb) (gdb) bt #0  0x00007fddd9f141bd in __lll_lock_wait () /lib64/libpthread.so.0 #1  0x00007fddd9f0fd02 in _l_lock_791 () /lib64/libpthread.so.0 #2  0x00007fddd9f0fc08 in pthread_mutex_lock () /lib64/libpthread.so.0 #3  0x00007fddda9f3e26 in mutexlock () /opt/cloudera/parcels/cdh/lib64/libhdfs.so.0.0.0 #4  0x00007fddda9ed6f1 in settlsexceptionstrings () /opt/cloudera/parcels/cdh/lib64/libhdfs.so.0.0.0 #5  0x00007fddda9ec38c in printexceptionandfreev () /opt/cloudera/parcels/cdh/lib64/libhdfs.so.0.0.0 #6  0x00007fddda9ec52d in printexceptionandfree () /opt/cloudera/parcels/cdh/lib64/libhdfs.so.0.0.0 #7  0x00007fddda9ed46b in getjnienv () /opt/cloudera/parcels/cdh/lib64/libhdfs.so.0.0.0 #8  0x00007fddda9eee94 in hdfsbuilderconnect () /opt/cloudera/parcels/cdh/lib64/libhdfs.so.0.0.0 #9  0x0000000000400950 in main ()

notice it's hanging in sort of global mutex lock

i think gdb backtrace stack should useful identify root cause of issue.

this should generic jni debugging question? if if you're interested here's c code spans jvm jni interaction - https://gist.github.com/tagar/7c42f82f5538004bda2f4ea0b0e0adc5

java version "1.8.0_141" gcc version 4.8.5 20150623 (red hat 4.8.5-11) (gcc)

runtime environment:

export ld_library_path=$cdh/lib64:$java_home/jre/lib/$os_arch/server export classpath=`hadoop classpath`  export _java_options=-xss1280m

thanks leads.

also, based on hanging stack trying fail 

#6  0x00007fddda9ec52d in printexceptionandfree () /opt/cloudera/parcels/cdh/lib64/libhdfs.so.0.0.0 #7  0x00007fddda9ed46b in getjnienv () /opt/cloudera/parcels/cdh/lib64/libhdfs.so.0.0.0

but hangs on attempt printexceptionandfreev () -> settlsexceptionstrings () -> mutexlock () lock..

root cause found https://issues.apache.org/jira/browse/hdfs-11851

thanks.


Comments

Post a Comment

Popular posts from this blog

angular - Ionic slides - dynamically add slides before and after -

hi i'm using ngfor create set of 3 slides while starting in middle i'm guaranteed able slide left or right on start. when slide right can simple listen reachedend , push slide array i'm looping. but have problem adding slide beginning. if same above , use e.g. array.unshift() or spread add item beginning, view think it's on position 0 , snaps view new slide. the code below work animates slide change index 1. slide = [0,1,2] //example loop slidechanged(event) { if(this.slides.isbeginning()){ this.slide = [this.slide[0]-1, ...this.slide]; this.slides.update(); this.slides.slideto(1) } } <ion-slides [initialslide]="1" (ionslidedidchange)="slidechanged($event)"> <ion-slide *ngfor="let item of slide"> <h1>slide {{item}}</h1> </ion-slide> </ion-slides> any appreciated! you can using ionslidenextend , ionslideprevend events slides . please
Read more

minify - Minimizing css files -

i want know how css files can minimized. currently, using external sites css minifier compress css files. however, after removing whitespaces, comments, etc, file sizes reduced 10-15%. how frameworks bootstrap manage make minimized versions kilobytes. as example, css is: body { background-color: #ff0; } the reduction goes 28 bytes 22 bytes other css files have lot more characters still smaller this. actually minifying code means it's remove thing code white space characters new line characters comments block delimiters it reduces amount of code has transferred on web , speed site load fastly.but unreadable format.
Read more

Add a dynamic header in angular 2 http provider -

i have http interceptor built via tutorial https://scotch.io/@kashyapmukkamala/using-http-interceptor-with-angular2 the problem need have dynamic header changes automatically once changes 'mode' in app. service able tell interceptor change header, or have interceptor pull header (which string)from service each request. able throwing away patch method, call http.patch('new header string') set header string. call in service controls 'mode' setting. wondering if there way interceptor pull recent value service each request or if can add method http provider via interceptor? i've tried call service in interceptor each request returns undefined. because creating new instance of service or copying value before service fired , loaded/changed data. i don't want pass header string every http provider call because defeats purpose of having interceptor, id able set once changes or have provider fetch service before makes request. tl;dr : need add autom
Read more