Local mode is fast. In particular older version pf hadoop take a lot of time scheduling tasks and a delay betwen map and reduce phase.
Local mode really helps with those little delays. On Monday, July 1, 2013, Guillaume Allain <guillau...@blinkbox.com> wrote: > Hi all, > > Would anybody have any comments or feedback about the hive local mode execution? It is advertised as providing a boost to performance for small data sets. It seem to fit nicely when running unit/integration tests on single node or virtual machine. > > My exact questions are the following : > > - How significantly diverge the local mode execution of queries compared to distributed mode? Do the results may be different in some way? > > - I have had encountered error when running complex queries (with several joins/distinct/groupbys) that seem to relate to configuration (see below). I got no exact answers from the ML and I am kind of ready to dive into the source code. > > Any idea where I should aim in order to solve that particular problem? > > Thanks in advance, > > Guillaume > > ________________________________ > From: Guillaume Allain > Sent: 18 June 2013 12:14 > To: user@hive.apache.org > Subject: FileNotFoundException when using hive local mode execution style > > Hi all, > > I plan to use hive local in order to speed-up unit testing on (very) small data sets. (Data is still on hdfs). I switch the local mode by setting the following variables : > > SET hive.exec.mode.local.auto=true; > SET mapred.local.dir=/user; > SET mapred.tmp.dir=file:///tmp; > (plus creating needed directories and permissions) > > Simple GROUP BY, INNER and OUTER JOIN queries work just fine (with up to 3 jobs) with nice performance improvements. > > Unfortunately I ran into a FileNotFoundException:/tmp/vagrant/hive_2013-06-17_16-10-05_614_7672774118904458113/-mr-10000/1/emptyFile) on some more complex query (4 jobs, distinct on top of several joins, see below logs if needed). > > Any idea about that error? What other option I am missing to have a fully fonctional local mode? > > Thanks in advance, Guillaume > > $ tail -50 /tmp/vagrant/vagrant_20130617171313_82baad8b-1961-4055-a52e-d8865b2cd4f8.lo > > 2013-06-17 16:10:05,669 INFO exec.ExecDriver (ExecDriver.java:execute(320)) - Using org.apache.hadoop.hive.ql.io.CombineHiveInputFormat > 2013-06-17 16:10:05,688 INFO exec.ExecDriver (ExecDriver.java:execute(342)) - adding libjars: file:///opt/events-warehouse/build/jars/joda-time.jar,file:///opt/events-warehouse/build/jars/we7-hive-udfs.jar,file:///usr/lib/hive/lib/hive-json-serde-0.2.jar,file:///usr/lib/hive/lib/hive-builtins-0.9.0-cdh4.1.2.jar,file:///opt/events-warehouse/build/jars/guava.jar > 2013-06-17 16:10:05,688 INFO exec.ExecDriver (ExecDriver.java:addInputPaths(840)) - Processing alias dc > 2013-06-17 16:10:05,688 INFO exec.ExecDriver (ExecDriver.java:addInputPaths(858)) - Adding input file hdfs://localhost/user/hive/warehouse/events_super_mart_test.db/dim_cohorts > 2013-06-17 16:10:05,689 INFO exec.Utilities (Utilities.java:isEmptyPath(1807)) - Content Summary not cached for hdfs://localhost/user/hive/warehouse/events_super_mart_test.db/dim_cohorts > 2013-06-17 16:10:06,185 INFO exec.ExecDriver (ExecDriver.java:addInputPath(789)) - Changed input file to file:/tmp/vagrant/hive_2013-06-17_16-10-05_614_7672774118904458113/-mr-10000/1 > 2013-06-17 16:10:06,226 INFO exec.ExecDriver (ExecDriver.java:addInputPaths(840)) - Processing alias $INTNAME > 2013-06-17 16:10:06,226 INFO exec.ExecDriver (ExecDriver.java:addInputPaths(858)) - Adding input file hdfs://localhost/tmp/hive-vagrant/hive_2013-06-17_16-09-42_560_4077294489999242367/-mr-10004 > 2013-06-17 16:10:06,226 INFO exec.Utilities (Utilities.java:isEmptyPath(1807)) - Content Summary not cached for hdfs://localhost/tmp/hive-vagrant/hive_2013-06-17_16-09-42_560_4077294489999242367/-mr-10004 > 2013-06-17 16:10:06,681 WARN conf.Configuration (Configuration.java:warnOnceIfDeprecated(808)) - session.id is deprecated. Instead, use dfs.metrics.session-id > 2013-06-17 16:10:06,682 INFO jvm.JvmMetrics (JvmMetrics.java:init(76)) - Initializing JVM Metrics with processName=JobTracker, sessionId= > 2013-06-17 16:10:06,688 INFO exec.ExecDriver (ExecDriver.java:createTmpDirs(215)) - Making Temp Directory: hdfs://localhost/tmp/hive-vagrant/hive_2013-06-17_16-09-42_560_4077294489999242367/-mr-10002 > 2013-06-17 16:10:06,706 WARN mapred.JobClient (JobClient.java:copyAndConfigureFiles(704)) - Use GenericOptionsParser for parsing the arguments. Applications should implement Tool for the same. > 2013-06-17 16:10:06,942 INFO io.CombineHiveInputFormat (CombineHiveInputFormat.java:getSplits(370)) - CombineHiveInputSplit creating pool for file:/tmp/vagrant/hive_2013-06-17_16-10-05_614_7672774118904458113/-mr-10000/1; using filter path file:/tmp/vagrant/hive_2013-06-17_16-10-05_614_7672774118904458113/-mr-10000/1 > 2013-06-17 16:10:06,943 INFO io.CombineHiveInputFormat (CombineHiveInputFormat.java:getSplits(370)) - CombineHiveInputSplit creating pool for hdfs://localhost/tmp/hive-vagrant/hive_2013-06-17_16-09-42_560_4077294489999242367/-mr-10004; using filter path hdfs://localhost/tmp/hive-vagrant/hive_2013-06-17_16-09-42_560_4077294489999242367/-mr-10004 > 2013-06-17 16:10:06,951 INFO mapred.FileInputFormat (FileInputFormat.java:listStatus(196)) - Total input paths to process : 2 > 2013-06-17 16:10:06,953 INFO mapred.JobClient (JobClient.java:run(982)) - Cleaning up the staging area file:/user/vagrant2000733611/.staging/job_local_0001 > 2013-06-17 16:10:06,953 ERROR security.UserGroupInformation (UserGroupInformation.java:doAs(1335)) - PriviledgedActionException as:vagrant (auth:SIMPLE) cause:java.io.FileNotFoundException: File does not exist: /tmp/vagrant/hive_2013-06-17_16-10-05_614_7672774118904458113/-mr-10000/1/emptyFile > 2013-06-17 16:10:06,956 ERROR exec.ExecDriver (SessionState.java:printError(403)) - Job Submission failed with exception 'java.io.FileNotFoundException(File does not exist: /tmp/vagrant/hive_2013-06-17_16-10-05_614_7672774118904458113/-mr-10000/1/emptyFile)' > java.io.FileNotFoundException: File does not exist: /tmp/vagrant/hive_2013-06-17_16-10-05_614_7672774118904458113/-mr-10000/1/emptyFile > at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:787) > at org.apache.hadoop.mapred.lib.CombineFileInputFormat$OneFileInfo.<init>(CombineFileInputFormat.java:462) > at org.apache.hadoop.mapred.lib.CombineFileInputFormat.getMoreSplits(CombineFileInputFormat.java:256) > at org.apache.hadoop.mapred.lib.CombineFileInputFormat.getSplits(CombineFileInputFormat.java:212) > at org.apache.hadoop.hive.shims.HadoopShimsSecure$CombineFileInputFormatShim.getSplits(HadoopShimsSecure.java:392) > at org.apache.hadoop.hive.shims.HadoopShimsSecure$CombineFileInputFormatShim.getSplits(HadoopShimsSecure.java:358) > at org.apache.hadoop.hive.ql.io.CombineHiveInputFormat.getSplits(CombineHiveInputFormat.java:387) > at org.apache.hadoop.mapred.JobClient.writeOldSplits(JobClient.java:1041) > at org.apache.hadoop.mapred.JobClient.writeSplits(JobClient.java:1033) > at org.apache.hadoop.mapred.JobClient.access$600(JobClient.java:172) > at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:943) > at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:896) > at java.security.AccessController.doPrivileged(Native Method) > at javax.security.auth.Subject.doAs(Subject.java:396) > at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1332) > at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:896) > at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:870) > at org.apache.hadoop.hive.ql.exec.ExecDriver.execute(ExecDriver.java:435) > at org.apache.hadoop.hive.ql.exec.ExecDriver.main(ExecDriver.java:677) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) > at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) > at java.lang.reflect.Method.invoke(Method.java:597) > at org.apache.hadoop.util.RunJar.main(RunJar.java:208) > > Installation detail: > > vagrant@hadoop:/opt/events-warehouse$ hadoop version > Hadoop 2.0.0-cdh4.1.2 > > vagrant@hadoop:/opt/events-warehouse$ ls /usr/lib/hive/lib/ | grep hive > hive-builtins-0.9.0-cdh4.1.2.jar > hive-cli-0.9.0-cdh4.1.2.jar > hive-common-0.9.0-cdh4.1.2.jar > hive-contrib-0.9.0-cdh4.1.2.jar > hive_contrib.jar > hive-exec-0.9.0-cdh4.1.2.jar > hive-hbase-handler-0.9.0-cdh4.1.2.jar > hive-hwi-0.9.0-cdh4.1.2.jar > hive-jdbc-0.9.0-cdh4.1.2.jar > hive-json-serde-0.2.jar > hive-metastore-0.9.0-cdh4.1.2.jar > hive-pdk-0.9.0-cdh4.1.2.jar > hive-serde-0.9.0-cdh4.1.2.jar > hive-service-0.9.0-cdh4.1.2.jar > hive-shims-0.9.0-cdh4.1.2.jar > > > > Guillaume Allain > Senior Development Engineer > t: +44 20 7117 0809 > m: > blinkbox music - the easiest way to listen to the music you love, for free > www.blinkboxmusic.com > >
