This will work, but I don't think that this is a good way to go, since you will be treating the symptom and not the actual problem, which is an overloaded node.
Igal. On Tue, May 1, 2012 at 6:57 PM, Andrew Purtell <[email protected]> wrote: > Does it make sense to include the below in ./bin/hbase and ./bin/hadoop: > > echo -17 > /proc/$PID/oom_adj > > -17 is OOM_DISABLE: http://linux-mm.org/OOM_Killer > > Best regards, > > - Andy > > Problems worthy of attack prove their worth by hitting back. - Piet Hein > (via Tom White) > > > > ----- Original Message ----- > > From: Alex Baranau <[email protected]> > > To: [email protected] > > Cc: > > Sent: Tuesday, May 1, 2012 8:27 AM > > Subject: Re: RegionServer silently stops (only "issue": > CMS-concurrent-mark ~80sec) > > > > Yep, that is what I thought (OOM). Our monitoring tool (sematext.com/spm > ) > > says that everything was OK with theregard to JVM memory consumption at > the > > time process stopped. But found that oom killer is one who killed it (on > > this cluster we have HBASE_HEAPSIZE=4000): > > > > /var/log/kern.log.1:Apr 30 18:59:04 ip-10-88-231-73 kernel: > > [32076201.925847] Out of memory: Kill process 15227 (java) score 573 or > > sacrifice child > > /var/log/kern.log.1-Apr 30 18:59:04 ip-10-88-231-73 kernel: > > [32076201.925881] Killed process 15227 (java) total-vm:4716576kB, > > anon-rss:4364780kB, file-rss:12020kB > > > > All clear, thanx! > > > > Alex Baranau > > ------ > > Sematext :: http://blog.sematext.com/ > > > > On Tue, May 1, 2012 at 9:02 AM, Dhaval Shah > > <[email protected]>wrote: > > > >> > >> > >> Not sure if its related (or even helpful) but we were using cdh3b4 > (which > >> is 0.90.1) and we saw similar issues with region servers going down.. > we > >> didn't look at GC logs but we had very high zookeeper leases so its > >> unlikely that the GC could have caused the issue.. this problem went > away > >> when we upgraded to cdh3u3 which is rock steady in terms of region > >> servers.. (havent had a single region server crash in a month where on > the > >> older version I used to have 1 crash every couple of days).. the only > other > >> difference between the two is that we use snappy on the newer one and > gz on > >> the old > >> > >> We also noticed that having replication enabled also contributed to the > >> issues.. > >> > >> > >> ------------------------------ > >> On Tue 1 May, 2012 3:15 PM IST N Keywal wrote: > >> > >> >Hi Alex, > >> > > >> >On the same idea, note that hbase is launched with > >> >-XX:OnOutOfMemoryError="kill -9 %p". > >> > > >> >N. > >> > > >> >On Tue, May 1, 2012 at 10:41 AM, Igal Shilman <[email protected]> > > wrote: > >> > > >> >> Hi Alex, just to rule out, oom killer, > >> >> Try this: > >> >> > >> >> > >> > > > http://stackoverflow.com/questions/624857/finding-which-process-was-killed-by-linux-oom-killer > >> >> > >> >> > >> >> On Mon, Apr 30, 2012 at 10:48 PM, Alex Baranau < > >> [email protected] > >> >> >wrote: > >> >> > >> >> > Hello, > >> >> > > >> >> > During recent weeks I constantly see some RSs *silently* > > dying on our > >> >> HBase > >> >> > cluster. By "silently" I mean that process stops, > > but no errors in > >> logs > >> >> > [1]. > >> >> > > >> >> > The only thing I can relate to it is long > > CMS-concurrent-mark: almost > >> 80 > >> >> > seconds. But this should not cause issues as it is not a > >> "stop-the-world" > >> >> > process. > >> >> > > >> >> > Any advice? > >> >> > > >> >> > HBase: hbase-0.90.4-cdh3u3 > >> >> > Hadoop: 0.20.2-cdh3u3 > >> >> > > >> >> > Thank you, > >> >> > Alex Baranau > >> >> > > >> >> > [1] > >> >> > > >> >> > last lines from RS log (no errors before too, and nothing > > written in > >> >> *.out > >> >> > file): > >> >> > > >> >> > 2012-04-30 18:52:11,806 DEBUG > >> >> > org.apache.hadoop.hbase.regionserver.CompactSplitThread: > > Compaction > >> >> > requested for agg-sa-1.3,0011| > >> >> > > >> >> > > >> >> > >> > > > te|dtc|\x00\x00\x00\x00\x00\x00<\x1E\x002\x00\x00\x00\x015\x9C_n\x00\x00\x00\x00\x00\x00\x00\x00\x00,1334852280902.4285f9339b520ee617c087c0fd0dbf65. > >> >> > because regionserver60020.cacheFlusher; priority=-1, > > compaction queue > >> >> > size=0 > >> >> > 2012-04-30 18:54:58,779 DEBUG > >> >> > > > org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogWriter: using > >> new > >> >> > createWriter -- HADOOP-6840 > >> >> > 2012-04-30 18:54:58,779 DEBUG > >> >> > > > org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogWriter: > >> >> > > >> >> > > >> >> > >> > > > Path=hdfs://xxx.ec2.internal/hbase/.logs/xxx.ec2.internal,60020,1335706613397/xxx.ec2.internal%3A60020.1335812098651, > >> >> > syncFs=true, hflush=false > >> >> > 2012-04-30 18:54:58,874 INFO > >> >> org.apache.hadoop.hbase.regionserver.wal.HLog: > >> >> > Roll > >> >> > > >> >> > > >> >> > >> > > > /hbase/.logs/xxx.ec2.internal,60020,1335706613397/xxx.ec2.internal%3A60020.1335811856672, > >> >> > entries=73789, filesize=63773934. New hlog > >> >> > > >> >> > > >> >> > >> > > > /hbase/.logs/xxx.ec2.internal,60020,1335706613397/xxx.ec2.internal%3A60020.1335812098651 > >> >> > 2012-04-30 18:56:31,867 INFO > >> >> > org.apache.hadoop.hbase.regionserver.MemStoreFlusher: Flush > > thread > >> woke > >> >> up > >> >> > with memory above low water. > >> >> > 2012-04-30 18:56:31,867 INFO > >> >> > org.apache.hadoop.hbase.regionserver.MemStoreFlusher: Flush > > of region > >> >> > agg-sa-1.3,s_00I4| > >> >> > > >> >> > > >> >> > >> > > > tdqc\x00docs|mrtdocs|\x00\x00\x00\x00\x00\x03\x11\xF4\x00none\x00|1334692562\x00\x0D\xE0\xB6\xB3\xA7c\xFF\xBC|26837373\x00\x00\x00\x016\xC1\xE0D\xBE\x00\x00\x00\x00\x00\x00\x00\x00,1335761291026.30b127193485342359eadf1586819805. > >> >> > due to global heap pressure > >> >> > 2012-04-30 18:56:31,867 DEBUG > >> >> org.apache.hadoop.hbase.regionserver.HRegion: > >> >> > Started memstore flush for agg-sa-1.3,s_00I4| > >> >> > > >> >> > > >> >> > >> > > > tdqc\x00docs|mrtdocs|\x00\x00\x00\x00\x00\x03\x11\xF4\x00none\x00|1334692562\x00\x0D\xE0\xB6\xB3\xA7c\xFF\xBC|26837373\x00\x00\x00\x016\xC1\xE0D\xBE\x00\x00\x00\x00\x00\x00\x00\x00,1335761291026.30b127193485342359eadf1586819805., > >> >> > current region memstore size 138.1m > >> >> > 2012-04-30 18:56:31,867 DEBUG > >> >> org.apache.hadoop.hbase.regionserver.HRegion: > >> >> > Finished snapshotting, commencing flushing stores > >> >> > 2012-04-30 18:56:56,303 DEBUG > >> >> > org.apache.hadoop.hbase.io.hfile.LruBlockCache: LRU Stats: > >> total=322.84 > >> >> MB, > >> >> > free=476.34 MB, max=799.17 MB, blocks=5024, > > accesses=12189396, > >> >> hits=127592, > >> >> > hitRatio=1.04%%, cachingAccesses=132480, cachingHits=126949, > >> >> > cachingHitsRatio=95.82%%, evictions=0, evicted=0, > > evictedPerRun=NaN > >> >> > 2012-04-30 18:56:59,026 INFO > >> org.apache.hadoop.hbase.regionserver.Store: > >> >> > Renaming flushed file at > >> >> > > >> >> > > >> >> > >> > > > hdfs://zzz.ec2.internal/hbase/agg-sa-1.3/30b127193485342359eadf1586819805/.tmp/391890051647401997 > >> >> > to > >> >> > > >> >> > > >> >> > >> > > > hdfs://zzz.ec2.internal/hbase/agg-sa-1.3/30b127193485342359eadf1586819805/a/1139737908876846168 > >> >> > 2012-04-30 18:56:59,034 INFO > >> org.apache.hadoop.hbase.regionserver.Store: > >> >> > Added > >> >> > > >> >> > > >> >> > >> > > > hdfs://zzz.ec2.internal/hbase/agg-sa-1.3/30b127193485342359eadf1586819805/a/1139737908876846168, > >> >> > entries=476418, sequenceid=880198761, memsize=138.1m, > > filesize=5.7m > >> >> > 2012-04-30 18:56:59,097 INFO > >> >> org.apache.hadoop.hbase.regionserver.HRegion: > >> >> > Finished memstore flush of ~138.1m for region > > agg-sa-1.3,s_00I4| > >> >> > > >> >> > > >> >> > >> > > > tdqc\x00docs|mrtdocs|\x00\x00\x00\x00\x00\x03\x11\xF4\x00none\x00|1334692562\x00\x0D\xE0\xB6\xB3\xA7c\xFF\xBC|26837373\x00\x00\x00\x016\xC1\xE0D\xBE\x00\x00\x00\x00\x00\x00\x00\x00,1335761291026.30b127193485342359eadf1586819805. > >> >> > in 27230ms, sequenceid=880198761, compaction requested=false > >> >> > ~ > >> >> > > >> >> > [2] > >> >> > > >> >> > last lines from GC log: > >> >> > > >> >> > 2012-04-30T18:58:46.683+0000: 105717.791: [GC 105717.791: > > [ParNew: > >> >> > 35638K->1118K(38336K), 0.0548970 secs] > > 3145651K->3111412K(4091776K) > >> >> > icms_dc=6 , 0.0550360 secs] [Times: user=0.08 sys=0.00, > > real=0.09 > >> secs] > >> >> > 2012-04-30T18:58:46.961+0000: 105718.069: [GC 105718.069: > > [ParNew: > >> >> > 35230K->2224K(38336K), 0.0802440 secs] > > 3145524K->3112533K(4091776K) > >> >> > icms_dc=6 , 0.0803810 secs] [Times: user=0.06 sys=0.00, > > real=0.13 > >> secs] > >> >> > 2012-04-30T18:58:47.114+0000: 105718.222: > > [CMS-concurrent-mark: > >> >> > 8.770/80.230 secs] [Times: user=61.34 sys=5.69, real=80.23 > > secs] > >> >> > 2012-04-30T18:58:47.114+0000: 105718.222: > >> [CMS-concurrent-preclean-start] > >> >> > 2012-04-30T18:58:47.183+0000: 105718.291: [GC 105718.291: > > [ParNew: > >> >> > 36336K->3895K(38336K), 0.0272610 secs] > > 3146645K->3114281K(4091776K) > >> >> > icms_dc=6 , 0.0274040 secs] [Times: user=0.05 sys=0.00, > > real=0.03 > >> secs] > >> >> > 2012-04-30T18:58:47.452+0000: 105718.560: [GC 105718.560: > > [ParNew: > >> >> > 37990K->3082K(38336K), 0.0504660 secs] > > 3148376K->3114329K(4091776K) > >> >> > icms_dc=6 , 0.0506020 secs] [Times: user=0.06 sys=0.00, > > real=0.05 > >> secs] > >> >> > 2012-04-30T18:58:47.823+0000: 105718.930: [GC 105718.931: > > [ParNew: > >> >> > 37194K->3340K(38336K), 0.0419660 secs] > > 3148441K->3115727K(4091776K) > >> >> > icms_dc=6 , 0.0421110 secs] [Times: user=0.05 sys=0.00, > > real=0.04 > >> secs] > >> >> > 2012-04-30T18:58:48.099+0000: 105719.207: [GC 105719.207: > > [ParNew: > >> >> > 37351K->3249K(38336K), 0.0695950 secs] > > 3149738K->3115636K(4091776K) > >> >> > icms_dc=6 , 0.0697320 secs] [Times: user=0.07 sys=0.00, > > real=0.07 > >> secs] > >> >> > 2012-04-30T18:58:48.447+0000: 105719.555: [GC 105719.555: > > [ParNew: > >> >> > 37361K->2512K(38336K), 0.0510560 secs] > > 3149748K->3116166K(4091776K) > >> >> > icms_dc=6 , 0.0512050 secs] [Times: user=0.05 sys=0.00, > > real=0.00 > >> secs] > >> >> > 2012-04-30T18:58:48.794+0000: 105719.902: [GC 105719.902: > > [ParNew: > >> >> > 36624K->2616K(38336K), 0.1986770 secs] > > 3150278K->3116270K(4091776K) > >> >> > icms_dc=6 , 0.1988160 secs] [Times: user=0.05 sys=0.00, > > real=0.20 > >> secs] > >> >> > 2012-04-30T18:58:49.614+0000: 105720.722: [GC 105720.722: > > [ParNew: > >> >> > 36728K->3450K(38336K), 0.1099190 secs] > > 3150382K->3117103K(4091776K) > >> >> > icms_dc=6 , 0.1100650 secs] [Times: user=0.05 sys=0.00, > > real=0.11 > >> secs] > >> >> > 2012-04-30T18:58:50.631+0000: 105721.739: [GC 105721.739: > > [ParNew: > >> >> > 37546K->3176K(38336K), 0.2096280 secs] > > 3151199K->3117154K(4091776K) > >> >> > icms_dc=6 , 0.2097770 secs] [Times: user=0.10 sys=0.00, > > real=0.21 > >> secs] > >> >> > 2012-04-30T18:58:51.300+0000: 105722.408: [GC 105722.408: > > [ParNew: > >> >> > 37288K->3928K(38336K), 0.0873820 secs] > > 3151266K->3117907K(4091776K) > >> >> > icms_dc=6 , 0.0875310 secs] [Times: user=0.05 sys=0.00, > > real=0.08 > >> secs] > >> >> > 2012-04-30T18:58:52.109+0000: 105723.217: [GC 105723.217: > > [ParNew: > >> >> > 38040K->2095K(38336K), 0.0791560 secs] > > 3152019K->3116839K(4091776K) > >> >> > icms_dc=6 , 0.0792970 secs] [Times: user=0.05 sys=0.00, > > real=0.08 > >> secs] > >> >> > 2012-04-30T18:58:53.132+0000: 105724.240: [GC 105724.240: > > [ParNew: > >> >> > 36207K->2581K(38336K), 0.1651210 secs] > > 3150951K->3117700K(4091776K) > >> >> > icms_dc=6 , 0.1652650 secs] [Times: user=0.06 sys=0.00, > > real=0.16 > >> secs] > >> >> > 2012-04-30T18:58:55.402+0000: 105726.510: [GC 105726.510: > > [ParNew: > >> >> > 36693K->2297K(38336K), 0.1262480 secs] > > 3151812K->3117742K(4091776K) > >> >> > icms_dc=6 , 0.1264420 secs] [Times: user=0.06 sys=0.00, > > real=0.13 > >> secs] > >> >> > 2012-04-30T18:58:56.103+0000: 105727.211: [GC 105727.211: > > [ParNew: > >> >> > 36409K->4224K(38336K), 0.3658760 secs] > > 3151854K->3120205K(4091776K) > >> >> > icms_dc=6 , 0.3660220 secs] > >> >> > > >> >> > >> > >> > > >
