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 Elser<[email protected]> > *收件人:* user<[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:* user<[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: > > > > List<Range> 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 > >
