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From Louis Hust <louis.h...@gmail.com>
Subject Re: Frequent flush and small compactions, region server load is very high
Date Wed, 20 May 2015 03:04:25 GMT
Hi, ted

hbase(main):001:0> describe 'ttsi_order:ttsi_order_process'
DESCRIPTION
       ENABLED
 'ttsi_order:ttsi_order_process', {NAME => 'orderinfo', DATA_BLOCK_ENCODING
=> 'NO true
 NE', BLOOMFILTER => 'ROW', REPLICATION_SCOPE => '0', VERSIONS => '1',
COMPRESSION
  => 'NONE', MIN_VERSIONS => '0', TTL => 'FOREVER', KEEP_DELETED_CELLS =>
'FALSE',
  BLOCKSIZE => '65536', IN_MEMORY => 'false', BLOCKCACHE => 'true'}
1 row(s) in 1.0260 seconds


2015-05-20 10:59 GMT+08:00 Ted Yu <yuzhihong@gmail.com>:

> How many column families does your table have ?
>
> Can you show us the output of " describe 'ttsi_order:ttsi_order_process' "
> ?
>
> Thanks
>
> On Tue, May 19, 2015 at 4:56 AM, Louis Hust <louis.hust@gmail.com> wrote:
>
> > Hi, all
> >
> > My cluster is cdh5.2.0 with hbase 0.98.6, and recently some region server
> > load is very high,
> > about 50, and the  CPU usage is about 2400%(with 24 core).
> >
> > I check the log in region server, and found frequent memstore flush and
> > compactions, is this the reason for the high load?
> >
> > {log}
> > 2015-05-19 08:40:21,749 INFO  [MemStoreFlusher.0] regionserver.HRegion:
> > Started memstore flush for
> >
> >
> ttsi_order:ttsi_order_process,fceaa9d2804f005B,1431599229048.378c4f2ebc93770ef6cbf956de60d093.,
> > current region memstore size 1.1 M
> > 2015-05-19 08:40:21,917 INFO  [MemStoreFlusher.0]
> > regionserver.DefaultStoreFlusher: Flushed, sequenceid=11905428,
> memsize=1.1
> > M, hasBloomFilter=true, into tmp file
> >
> >
> hdfs://mycluster:8020/hbase/airfare/data/ttsi_order/ttsi_order_process/378c4f2ebc93770ef6cbf956de60d093/.tmp/6fab6457782048898b1547c422fc0c82
> > 2015-05-19 08:40:21,934 DEBUG [MemStoreFlusher.0]
> > regionserver.HRegionFileSystem: Committing store file
> >
> >
> hdfs://mycluster:8020/hbase/airfare/data/ttsi_order/ttsi_order_process/378c4f2ebc93770ef6cbf956de60d093/.tmp/6fab6457782048898b1547c422fc0c82
> > as
> >
> >
> hdfs://mycluster:8020/hbase/airfare/data/ttsi_order/ttsi_order_process/378c4f2ebc93770ef6cbf956de60d093/orderinfo/6fab6457782048898b1547c422fc0c82
> > 2015-05-19 08:40:21,941 INFO  [MemStoreFlusher.0] regionserver.HStore:
> > Added
> >
> >
> hdfs://mycluster:8020/hbase/airfare/data/ttsi_order/ttsi_order_process/378c4f2ebc93770ef6cbf956de60d093/orderinfo/6fab6457782048898b1547c422fc0c82,
> > entries=1441, sequenceid=11905428, filesize=847.8 K
> > 2015-05-19 08:40:21,941 INFO  [MemStoreFlusher.0] regionserver.HRegion:
> > Finished memstore flush of ~1.1 M/1126904, currentsize=0/0 for region
> >
> >
> ttsi_order:ttsi_order_process,fceaa9d2804f005B,1431599229048.378c4f2ebc93770ef6cbf956de60d093.
> > in 192ms, sequenceid=11905428, compaction requested=true
> > 2015-05-19 08:40:21,941 DEBUG [MemStoreFlusher.0]
> > regionserver.CompactSplitThread: Small Compaction requested: system;
> > Because: MemStoreFlusher.0; compaction_queue=(0:0), split_queue=0,
> > merge_queue=0
> > 2015-05-19 08:40:21,941 DEBUG
> > [regionserver60020-smallCompactions-1431261234450]
> > compactions.RatioBasedCompactionPolicy: Selecting compaction from 4 store
> > files, 0 compacting, 4 eligible, 30 blocking
> > 2015-05-19 08:40:21,941 DEBUG
> > [regionserver60020-smallCompactions-1431261234450]
> > compactions.ExploringCompactionPolicy: Exploring compaction algorithm has
> > selected 3 files of size 36749798 starting at candidate #1 after
> > considering 3 permutations with 1 in ratio
> > 2015-05-19 08:40:21,941 DEBUG
> > [regionserver60020-smallCompactions-1431261234450] regionserver.HStore:
> > 378c4f2ebc93770ef6cbf956de60d093 - orderinfo: Initiating minor compaction
> > 2015-05-19 08:40:21,941 INFO
> >  [regionserver60020-smallCompactions-1431261234450] regionserver.HRegion:
> > Starting compaction on orderinfo in region
> >
> >
> ttsi_order:ttsi_order_process,fceaa9d2804f005B,1431599229048.378c4f2ebc93770ef6cbf956de60d093.
> > 2015-05-19 08:40:21,942 INFO
> >  [regionserver60020-smallCompactions-1431261234450] regionserver.HStore:
> > Starting compaction of 3 file(s) in orderinfo of
> >
> >
> ttsi_order:ttsi_order_process,fceaa9d2804f005B,1431599229048.378c4f2ebc93770ef6cbf956de60d093.
> > into
> >
> >
> tmpdir=hdfs://mycluster:8020/hbase/airfare/data/ttsi_order/ttsi_order_process/378c4f2ebc93770ef6cbf956de60d093/.tmp,
> > totalSize=35.0 M
> > 2015-05-19 08:40:21,942 DEBUG
> > [regionserver60020-smallCompactions-1431261234450] compactions.Compactor:
> > Compacting
> >
> >
> hdfs://mycluster:8020/hbase/airfare/data/ttsi_order/ttsi_order_process/378c4f2ebc93770ef6cbf956de60d093/orderinfo/a89297d7bbc34db7aa9f23e42789e2bd,
> > keycount=22628, bloomtype=ROW, size=33.8 M, encoding=NONE,
> seqNum=11902843
> > 2015-05-19 08:40:21,942 DEBUG
> > [regionserver60020-smallCompactions-1431261234450] compactions.Compactor:
> > Compacting
> >
> >
> hdfs://mycluster:8020/hbase/airfare/data/ttsi_order/ttsi_order_process/378c4f2ebc93770ef6cbf956de60d093/orderinfo/d1f8531b00fa4f77ad901001ebe39644,
> > keycount=512, bloomtype=ROW, size=468.8 K, encoding=NONE, seqNum=11903863
> > 2015-05-19 08:40:21,942 DEBUG
> > [regionserver60020-smallCompactions-1431261234450] compactions.Compactor:
> > Compacting
> >
> >
> hdfs://mycluster:8020/hbase/airfare/data/ttsi_order/ttsi_order_process/378c4f2ebc93770ef6cbf956de60d093/orderinfo/6fab6457782048898b1547c422fc0c82,
> > keycount=597, bloomtype=ROW, size=847.8 K, encoding=NONE, seqNum=11905428
> > {/log}
> >
> > Why the flush so small memstore which just  1.1 M, and many other flush
> > even small than 1M。
> >
> >
> > My configuration:
> >
> > RegionServer: MaxHeap: 64G
> > hbase.hregion.memstore.flush.size = 128M
> > hbase.regionserver.global.memstore.upperLimit=0.4
> > hbase.regionserver.global.memstore.lowerLimit=0.38
> > hbase.hregion.memstore.block.multiplier=4
> > hbase.hregion.memstore.mslab.enabled=true
> > hbase.hregion.max.filesize = 10G
> > hbase.hstore.compaction.max=10
> > hbase.hstore.compactionThreshold=3
> > hbase.hstore.compaction.kv.max=10
> >
> > And the region server has 223 regions.
> >
>

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