{"id":2018,"date":"2017-12-07T08:42:42","date_gmt":"2017-12-07T08:42:42","guid":{"rendered":"http:\/\/www.scmgalaxy.com\/tutorials\/?p=2018"},"modified":"2020-01-09T09:44:06","modified_gmt":"2020-01-09T09:44:06","slug":"suddenly-started-hanging","status":"publish","type":"post","link":"https:\/\/www.devopsschool.com\/blog\/suddenly-started-hanging\/","title":{"rendered":"Suddenly started hanging"},"content":{"rendered":"

pasupuleti2 created the topic: Suddenly started hanging<\/strong>
\nSuddenly jenkins started hanging. that keeps hanging every second. We have many projects in Jenkins. The jobs were running fine in the past. Yesterday I installed Perl plugins in jenkins and suddenly it started hanging. Nothing is dispalying.<\/p>\n

Please help me to resolve this issue without loosing old Jenkins projects, Script, configurations and build history.<\/p>\n

-Saritha<\/p>\n

rajeshkumar replied the topic: Suddenly started hanging<\/strong>
\nFirst, check if Jenkins responds to the HTTP requests. For example, if it does but it always shows “Please wait while Jenkins is getting ready to work…”, please tell that to us. If it doesn’t respond to requests at all, please tell that to us, too.<\/p>\n

The most common forms of hangups are:<\/p>\n

Jenkins shows “Please wait while Jenkins is getting ready to work…” for long time and it never comes up.
\nJenkins is not picking up HTTP requests, so all attempts to connect hang and no page is ever rendered. This is often caused by a dead lock.
\nJenkins runs out of heap space and goes into a fatal GC spiral.<\/p>\n

Either case, check the following steps to obtain further details:<\/p>\n

1. See Obtaining a thread dump and obtain a thread dump.
\nwiki.jenkins-ci.org\/display\/JENKINS\/Obtaining+a+thread+dump
\n2. Use jmap -heap to obtain the heap summary information. This is primarily to see if the system is in the GC spiral. If possible, add the -dump:format=b,file=heap.hprof option to obtain the full heap dump, or use kill -SIGABRT to generate the core dump. Send that to us and it’ll be lot easier for us to understand what’s going on.
\ndownload.oracle.com\/javase\/1,5.0\/docs\/tooldocs\/share\/jmap.html <\/a><\/p>\n

Similarly, if the hang is the “Please wait while Jenkins is getting ready to work…” kind of hang, please repeat this process a few times with several minutes (or longer) interval and report them all.<\/p>\n

Source – wiki.jenkins-ci.org\/display\/JENKINS\/Jenkins+is+hanging<\/a>
\nRegards,
\nRajesh Kumar
\nTwitt me @ twitter.com\/RajeshKumarIn<\/a><\/p>\n

pasupuleti2 replied the topic: Suddenly started hanging<\/strong>
\nRajesh,<\/p>\n

Tried jmap command. I got below message.<\/p>\n

C:\\Program Files\\Java\\jre7\\bin>jmap -dump:format=b,file=heapJMap.bin 7540
\n‘jmap’ is not recognized as an internal or external command,
\noperable program or batch file.<\/p>\n

C:\\Program Files\\Java\\jre7\\bin>JMap
\n‘JMap’ is not recognized as an internal or external command,
\noperable program or batch file.<\/p>\n

C:\\Program Files\\Java\\jre7\\bin>java -version
\njava version “1.7.0_51”
\nJava(TM) SE Runtime Environment (build 1.7.0_51-b13)
\nJava HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)<\/p>\n","protected":false},"excerpt":{"rendered":"

pasupuleti2 created the topic: Suddenly started hanging Suddenly jenkins started hanging. that keeps hanging every second. We have many projects in Jenkins. The jobs were running fine in the past…. <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[42],"tags":[434],"class_list":["post-2018","post","type-post","status-publish","format-standard","hentry","category-jenkins","tag-hanging"],"_links":{"self":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/2018","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/comments?post=2018"}],"version-history":[{"count":2,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/2018\/revisions"}],"predecessor-version":[{"id":5341,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/2018\/revisions\/5341"}],"wp:attachment":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/media?parent=2018"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/categories?post=2018"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/tags?post=2018"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}