Thanks Ted, For scenario #1, can not see any clues in regionserver log file that denotes "kill -9" command was executed. Meanwhile, i think when JVM inspects regionserver process OOME, it will create a new thread to execute "kill -9 %p", the new thread should not write regionserver log, so the fact, there is not any clues in regionserver log, is normal. Right? For scenario #2, dmesg also did not provide any clues. But some clues were seen in /var/log/messages: ...... May 14 12:00:38 localhost kernel: Out of memory: Kill process 22827 (java) score 497 or sacrifice child May 14 12:00:38 localhost kernel: Killed process 22827, UID 483, (java) total-vm:17569220kB, anon-rss:16296276kB, file-rss:240kB ...... The 22827 above is regionserver PID. It looks like regionserver itself OOM(total-vm:17569220kB, anon-rss:16296276kB, the max-heap-size set is 15G), so was killed. Right? But hbase has no heavy load in the cluster, so i don't think it was killed because of itself OOME, instead i think because of lack of memory for other applications, so OS kill regionserver to run more applications. I currently has no evidence to prove my idea, so hope more helps. Thanks.
At 2015-05-20 10:04:19, "Ted Yu" <yuzhih...@gmail.com> wrote: >For scenario #1, you would see in the regionserver.out file that "kill -9 " >command was applied due to OOME. > >For scenario #2, can you see if dmesg provides some clue ? > >Cheers > >On Tue, May 19, 2015 at 6:32 PM, David chen <c77...@163.com> wrote: > >> Thanks for guys reply, its indeed helped me. >> Another question, I think there are two possibilities to kill RegionServer >> process: >> 1. When JVM inspects that the memory, RegionServer has occupied, exceed >> the max-heap-size, then JVM calls positively the command configured by >> option "-XX:OnOutOfMemoryError=kill -9 %p" to kill RegionServer process. >> 2. RegionServer process does not reach the max-heap-size, but new >> application need to allocation memory, if lack of memory, OS will choose >> to kill some processes, RegionServer unfortunately becomes the first >> choice, so it is killed by OS. >> Is my understanding right? If so, how to know which possibility my scene >> is? >> Any ideas can be appreciated! >>
