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] >> >> > >> >> >> >> >
