[ https://issues.apache.org/jira/browse/HBASE-9642?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Devaraj Das updated HBASE-9642: ------------------------------- Attachment: 9642-1.txt Sorry about this one. I have fixed this so that the maps are null under the non-test situations, and the updates don't happen to the maps then.. (imo this is good enough for now). > AM ZK Workers stuck doing 100% CPU on HashMap.put > ------------------------------------------------- > > Key: HBASE-9642 > URL: https://issues.apache.org/jira/browse/HBASE-9642 > Project: HBase > Issue Type: Bug > Affects Versions: 0.96.0 > Reporter: Jean-Daniel Cryans > Assignee: Devaraj Das > Priority: Blocker > Fix For: 0.98.0, 0.96.0 > > Attachments: 9642-1.txt > > > I just noticed on my test cluster that my master is using all my CPUs even > though it's completely idle. 5 threads are doing this: > {noformat} > "AM.ZK.Worker-pool2-t34" daemon prio=10 tid=0x00007f68ac176800 nid=0x5251 > runnable [0x00007f688cc83000] > java.lang.Thread.State: RUNNABLE > at java.util.HashMap.put(HashMap.java:374) > at > org.apache.hadoop.hbase.master.AssignmentManager.handleRegion(AssignmentManager.java:954) > at > org.apache.hadoop.hbase.master.AssignmentManager$6.run(AssignmentManager.java:1419) > at > org.apache.hadoop.hbase.master.AssignmentManager$3.run(AssignmentManager.java:1247) > at > java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439) > at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) > at java.util.concurrent.FutureTask.run(FutureTask.java:138) > at > java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) > {noformat} > Looking at the code, I see HBASE-9095 introduced two HashMaps *for tests > only* but they end up being used concurrently in the AM _and_ are never > cleaned up. It seems to me that any master running since that patch was > committed has a time bomb in it. > I'm marking this as a blocker. [~devaraj] and [~jxiang], you guys wanna take > a look at this? -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira