Does the wiki really recommend that? Got a link handy? On Thu, Feb 3, 2011 at 10:20 PM, charan kumar <charan.ku...@gmail.com>wrote:
> Todd, > > That did the trick. I think the wiki should be updated as well, no point > in recommending ParNew 6M or is it? > > Thanks, > Charan. > > On Thu, Feb 3, 2011 at 2:06 PM, Charan K <charan.ku...@gmail.com> wrote: > > > Thanks Todd.. I will try it out .. > > > > > > On Feb 3, 2011, at 1:43 PM, Todd Lipcon <t...@cloudera.com> wrote: > > > > > Hi Charan, > > > > > > Your GC settings are way off - 6m newsize will promote way too much to > > the > > > oldgen. > > > > > > Try this: > > > > > > -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -Xmn256m > > > -XX:CMSInitiatingOccupancyFraction=70 > > > > > > -Todd > > > > > > On Thu, Feb 3, 2011 at 12:28 PM, charan kumar <charan.ku...@gmail.com > > >wrote: > > > > > >> HI Jonathan, > > >> > > >> Thanks for you quick reply.. > > >> > > >> Heap is set to 4G. > > >> > > >> Following are the JVM opts. > > >> export HBASE_OPTS="$HBASE_OPTS -XX:+HeapDumpOnOutOfMemoryError > > >> -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:NewSize=6m > > >> -XX:MaxNewSize=6m" > > >> > > >> Are there any other options apart from increasing the RAM? > > >> > > >> I am adding some more info about the app. > > >> > > >>> We are storing web page data in HBase. > > >>> Row key is Hashed URL, for random distribution, since we dont plan to > > do > > >> scan's.. > > >>> We have LZOCompression Set on this column family. > > >>> We were noticing 1500 Reads, when reading the page content. > > >>> We have a column family, which stores just metadata of the page > "title" > > >> etc... When reading this the performance is whopping 12000 TPS. > > >> > > >> We though the issue could be because of N/w bandwidth used between > HBase > > >> and Clients. So we disable LZO Compression on Column Family and > started > > >> doing the compression of the raw page on the client and decompress it > > when > > >> readind (LZO). > > >> > > >>> With this my write performance jumped up from 2000 to 5000 at peak. > > >>> With this approach, the servers are crashing... Not sure , why only > > >> after > > >> turning of LZO... and doing the same from client. > > >> > > >> > > >> > > >> On Thu, Feb 3, 2011 at 12:13 PM, Jonathan Gray <jg...@fb.com> wrote: > > >> > > >>> How much heap are you running on your RegionServers? > > >>> > > >>> 6GB of total RAM is on the low end. For high throughput > applications, > > I > > >>> would recommend at least 6-8GB of heap (so 8+ GB of RAM). > > >>> > > >>>> -----Original Message----- > > >>>> From: charan kumar [mailto:charan.ku...@gmail.com] > > >>>> Sent: Thursday, February 03, 2011 11:47 AM > > >>>> To: user@hbase.apache.org > > >>>> Subject: Region Servers Crashing during Random Reads > > >>>> > > >>>> Hello, > > >>>> > > >>>> I am using hbase 0.90.0 with hadoop-append. h/w ( Dell 1950, 2 CPU, > 6 > > >> GB > > >>>> RAM) > > >>>> > > >>>> I had 9 Region Servers crash (out of 30) in a span of 30 minutes > > during > > >> a > > >>> heavy > > >>>> reads. It looks like a GC, ZooKeeper Connection Timeout thingy to > me. > > >>>> I did all recommended configuration from the Hbase wiki... Any other > > >>>> suggestions? > > >>>> > > >>>> > > >>>> 2011-02-03T09:43:07.890-0800: 70693.632: [GC 70693.632: [ParNew > > >>>> (promotion > > >>>> failed): 5555K->5540K(5568K), 0.0280950 secs]70693.660: > > >>>> [CMS2011-02-03T09:43:16.864-0800: 70702.606: [CMS-concurrent-mark: > > >>>> 12.549/69.323 secs] [Times: user=11.90 sys=1.26, real=69.31 secs] > > >>>> > > >>>> 2011-02-03T09:53:35.165-0800: 71320.785: [GC 71320.785: [ParNew > > >>>> (promotion > > >>>> failed): 5568K->5568K(5568K), 0.4384530 secs]71321.224: > > >>>> [CMS2011-02-03T09:53:45.111-0800: 71330.731: [CMS-concurrent-mark: > > >>>> 17.511/51.564 secs] [Times: user=38.72 sys=5.67, real=51.60 secs] > > >>>> > > >>>> 2011-02-03T09:43:07.890-0800: 70693.632: [GC 70693.632: [ParNew > > >>>> (promotion > > >>>> failed): 5555K->5540K(5568K), 0.0280950 secs]70693.660: > > >>>> [CMS2011-02-03T09:43:16.864-0800: 70702.606: [CMS-concurrent-mark: > > >>>> 12.549/69.323 secs] [Times: user=11.90 sys=1.26, real=69.31 secs] > > >>>> > > >>>> > > >>>> The following is the log entry in region Server > > >>>> > > >>>> 2011-02-03 10:37:43,946 INFO org.apache.zookeeper.ClientCnxn: Client > > >>>> session timed out, have not heard from server in 47172ms for > sessionid > > >>>> 0x12db9f722421ce3, closing socket connection and attempting > reconnect > > >>>> 2011-02-03 10:37:43,947 INFO org.apache.zookeeper.ClientCnxn: Client > > >>>> session timed out, have not heard from server in 48159ms for > sessionid > > >>>> 0x22db9f722501d93, closing socket connection and attempting > reconnect > > >>>> 2011-02-03 10:37:44,401 INFO org.apache.zookeeper.ClientCnxn: > Opening > > >>>> socket connection to server XXXXXXXXXXXXXXXX > > >>>> 2011-02-03 10:37:44,402 INFO org.apache.zookeeper.ClientCnxn: Socket > > >>>> connection established to XXXXXXXXX, initiating session > > >>>> 2011-02-03 10:37:44,709 INFO org.apache.zookeeper.ClientCnxn: > Opening > > >>>> socket connection to server XXXXXXXXXXXXXXX > > >>>> 2011-02-03 10:37:44,709 INFO org.apache.zookeeper.ClientCnxn: Socket > > >>>> connection established to XXXXXXXXXXXXXXXXXXXXX, initiating session > > >>>> 2011-02-03 10:37:44,767 DEBUG > > >>>> org.apache.hadoop.hbase.io.hfile.LruBlockCache: Block cache LRU > > >> eviction > > >>>> started; Attempting to free 81.93 MB of total=696.25 MB > > >>>> 2011-02-03 10:37:44,784 DEBUG > > >>>> org.apache.hadoop.hbase.io.hfile.LruBlockCache: Block cache LRU > > >> eviction > > >>>> completed; freed=81.94 MB, total=614.81 MB, single=379.98 MB, > > >>>> multi=309.77 MB, memory=0 KB > > >>>> 2011-02-03 10:37:45,205 INFO org.apache.zookeeper.ClientCnxn: Unable > > to > > >>>> reconnect to ZooKeeper service, session 0x22db9f722501d93 has > expired, > > >>>> closing socket connection > > >>>> 2011-02-03 10:37:45,206 INFO > > >>>> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplem > > >>>> entation: > > >>>> This client just lost it's session with ZooKeeper, trying to > > reconnect. > > >>>> 2011-02-03 10:37:45,453 INFO > > >>>> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplem > > >>>> entation: > > >>>> Trying to reconnect to zookeeper > > >>>> 2011-02-03 10:37:45,206 INFO org.apache.zookeeper.ClientCnxn: Unable > > to > > >>>> reconnect to ZooKeeper service, session 0x12db9f722421ce3 has > expired, > > >>>> closing socket connection > > >>>> gionserver:60020-0x22db9f722501d93 regionserver:60020- > > >>>> 0x22db9f722501d93 > > >>>> received expired from ZooKeeper, aborting > > >>>> org.apache.zookeeper.KeeperException$SessionExpiredException: > > >>>> KeeperErrorCode = Session expired > > >>>> at > > >>>> org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.connectionEvent( > > >>>> ZooKeeperWatcher.java:328) > > >>>> at > > >>>> org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.process(ZooKeep > > >>>> erWatcher.java:246) > > >>>> at > > >>>> > org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.ja > > >>>> va:530) > > >>>> at > > >>>> org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:506) > > >>>> handled exception: org.apache.hadoop.hbase.YouAreDeadException: > Server > > >>>> REPORT rejected; currently processing > XXXXXXXXXXXX,60020,1296684296172 > > >>>> as dead server > > >>>> org.apache.hadoop.hbase.YouAreDeadException: > > >>>> org.apache.hadoop.hbase.YouAreDeadException: Server REPORT rejected; > > >>>> currently processing XXXXXXXXXXXX,60020,1296684296172 as dead server > > >>>> at > > >> sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native > > >>>> Method) > > >>>> at > > >>>> > > sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructor > > >>>> AccessorImpl.java:39) > > >>>> at > > >>>> > > sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingCon > > >>>> structorAccessorImpl.java:27) > > >>>> at > > >>> java.lang.reflect.Constructor.newInstance(Constructor.java:513) > > >>>> at > > >>>> > org.apache.hadoop.ipc.RemoteException.instantiateException(RemoteExce > > >>>> ption.java:96) > > >>>> at > > >>>> org.apache.hadoop.ipc.RemoteException.unwrapRemoteException(Remote > > >>>> Exception.java:80) > > >>>> at > > >>>> > org.apache.hadoop.hbase.regionserver.HRegionServer.tryRegionServerRep > > >>>> ort(HRegionServer.java:729) > > >>>> at > > >>>> > org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.j > > >>>> ava:586) > > >>>> at java.lang.Thread.run(Thread.java:619) > > >>>> > > >>>> > > >>>> 2011-02-03T09:53:35.165-0800: 71320.785: [GC 71320.785: [ParNew > > >>>> (promotion > > >>>> failed): 5568K->5568K(5568K), 0.4384530 secs]71321.224: > > >>>> [CMS2011-02-03T09:53:45.111-0800: 71330.731: [CMS-concurrent-mark: > > >>>> 17.511/51.564 secs] [Times: user=38.72 sys=5.67, real=51.60 secs] > > >>>> > > >>>> > > >>>> > > >>>> Thanks, > > >>>> Charan > > >>> > > >> > > > > > > > > > > > > -- > > > Todd Lipcon > > > Software Engineer, Cloudera > > > -- Todd Lipcon Software Engineer, Cloudera
