Yes,I received all results what I want when the program end. But I do not know why the scan received 0 result when I ensure a exists row id? I config the table.cache.block.enable=true,but I do not found distinct change. Thanks
原始邮件 发件人:Eric [email protected] 收件人:[email protected][email protected] 发送时间:2015年1月14日(周三) 00:17 主题:Re: 回复：how can i optimize scan speed when use batch scan ? You should have received at least 1390 Key/Value pairs (#results=1390). If your application has many exact RowID look-ups, you may want to investigate Bloom filters. Consider turning on data block caching to reduce latency on future look-ups. -Eric On Mon, Jan 12, 2015 at 8:15 PM, 覃璐 [email protected] wrote: i am sorry i do not know about the image. the log is this: [17:50:38] TRACE [org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator] [org.apache.accumulo.core.util.OpTimer.start(OpTimer.java:39)] [21521] - tid=65 oid=675 Continuing multi scan, scanid=-152589127623326551 [17:50:38] TRACE [org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator] [org.apache.accumulo.core.util.OpTimer.stop(OpTimer.java:49)] [21544] - tid=65 oid=675 Got more multi scan results, #results=1390 scanID=-152589127623326551 in 0.023 secs [17:50:38] TRACE [org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator] [org.apache.accumulo.core.util.OpTimer.start(OpTimer.java:39)] [21546] - tid=65 oid=676 Continuing multi scan, scanid=-152589127623326551 [17:50:38] TRACE [org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator] [org.apache.accumulo.core.util.OpTimer.stop(OpTimer.java:49)] [21555] - tid=45 oid=644 Got more multi scan results, #results=0 scanID=-4477962012178388198 in 1.002 secs [17:50:38] TRACE [org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator] [org.apache.accumulo.core.util.OpTimer.start(OpTimer.java:39)] [21555] - tid=45 oid=677 Continuing multi scan, scanid=-4477962012178388198 [17:50:38] TRACE [org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator] [org.apache.accumulo.core.util.OpTimer.stop(OpTimer.java:49)] [21596] - tid=57 oid=645 Got more multi scan results, #results=0 scanID=-8718025066902358141 in 1.003 secs [17:50:38] TRACE [org.apache.accumulo.core.client.impl.TabletServerBatchReaderIterator] [org.apache.accumulo.core.util.OpTimer.start(OpTimer.java:39)] [21596] - tid=57 oid=678 Continuing multi scan, scanid=-8718025066902358141 the scan spend long time but has no result. i use 1.6.1,and the config output is this: default | table.balancer ............................ | org.apache.accumulo.server.master.balancer.DefaultLoadBalancer default | table.bloom.enabled ....................... | false default | table.bloom.error.rate .................... | 0.5% default | table.bloom.hash.type ..................... | murmur default | table.bloom.key.functor ................... | org.apache.accumulo.core.file.keyfunctor.RowFunctor default | table.bloom.load.threshold ................ | 1 default | table.bloom.size .......................... | 1048576 default | table.cache.block.enable .................. | false default | table.cache.index.enable .................. | true default | table.classpath.context ................... | default | table.compaction.major.everything.idle .... | 1h default | table.compaction.major.ratio .............. | 3 default | table.compaction.minor.idle ............... | 5m default | table.compaction.minor.logs.threshold ..... | 3 table | table.constraint.1 ........................ | org.apache.accumulo.core.constraints.DefaultKeySizeConstraint default | table.failures.ignore ..................... | false default | table.file.blocksize ...................... | 0B default | table.file.compress.blocksize ............. | 100K default | table.file.compress.blocksize.index ....... | 128K default | table.file.compress.type .................. | gz default | table.file.max ............................ | 15 default | table.file.replication .................... | 0 default | table.file.type ........................... | rf default | table.formatter ........................... | org.apache.accumulo.core.util.format.DefaultFormatter default | table.groups.enabled ...................... | default | table.interepreter ........................ | org.apache.accumulo.core.util.interpret.DefaultScanInterpreter table | table.iterator.majc.vers .................. | 20,org.apache.accumulo.core.iterators.user.VersioningIterator table | table.iterator.majc.vers.opt.maxVersions .. | 1 table | table.iterator.minc.vers .................. | 20,org.apache.accumulo.core.iterators.user.VersioningIterator table | table.iterator.minc.vers.opt.maxVersions .. | 1 table | table.iterator.scan.vers .................. | 20,org.apache.accumulo.core.iterators.user.VersioningIterator table | table.iterator.scan.vers.opt.maxVersions .. | 1 default | table.majc.compaction.strategy ............ | org.apache.accumulo.tserver.compaction.DefaultCompactionStrategy default | table.scan.max.memory ..................... | 512K default | table.security.scan.visibility.default .... | default | table.split.threshold ..................... | 1G default | table.walog.enabled ....................... | true and my tablet server is 4 core,32G. Thanks 原始邮件 发件人:Josh [email protected] 收件人:[email protected] 发送时间:2015年1月12日(周一) 23:52 主题:Re: 回复：how can i optimize scan speed when use batch scan ? FYI, images don't (typically) come across on the mailing list. Use some external hosting and provide the link if it's important, please. How many tabletservers do you have? What version of Accumulo are you running? Can you share the output of `config -t your_table_name`? Thanks. 覃璐 wrote: i look the trace log why it receive 0 result and spend so long? 原始邮件 *发件人:* 覃璐[email protected] *收件人:* [email protected] *发送时间:* 2015年1月12日(周一) 17:05 *主题:* how can i optimize scan speed when use batch scan ? hi all. now i have code like this: ListRange rangeList=…..; BatchScanner bs=conn.createBatchScanner(); bs.setRanges(rangeList); the rangeList has many ranges about 1000,and every range has a random row id when i use Range.exact(new Text(…)), but the speed is so slowly,it maybe spend 2-3s,how can i optimize it ? thanks
