问题导读1.测试insert报错,该如何解决?2.hive delete和update报错,该如何解决?3.什么情况下才允许delete和update?首先用最普通的建表语句建一个表: hive>create table test(id int,name string)row format delimited fields terminated by ',';复制代码测试insert: insert into table test values (1,'row1'),(2,'row2');复制代码结果报错: java.io.FileNotFoundException: File does not exist: hdfs://127.0.0.1:9000/home/hadoop/git/hive/packaging/target/apache-hive-0.14.0-SNAPSHOT-bin/ apache-hive-0.14.0-SNAPSHOT-bin/lib/curator-client-2.6.0.jar at org.apache.hadoop.hdfs.DistributedFileSystem$17.doCall(DistributedFileSystem.java:1128) at org.apache.hadoop.hdfs.DistributedFileSystem$17.doCall(DistributedFileSystem.java:1120) at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81) at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1120) at org.apache.hadoop.mapreduce.filecache.ClientDistributedCacheManager.getFileStatus(ClientDistributedCacheManager.java:288) at org.apache.hadoop.mapreduce.filecache.ClientDistributedCacheManager.getFileStatus(ClientDistributedCacheManager.java:224) at org.apache.hadoop.mapreduce.filecache.ClientDistributedCacheManager.determineTimestamps(ClientDistributedCacheManager.java:99) at org.apache.hadoop.mapreduce.filecache.ClientDistributedCacheManager.determineTimestampsAndCacheVisibilities(ClientDistributedCacheManager.java:57) at org.apache.hadoop.mapreduce.JobSubmitter.copyAndConfigureFiles(JobSubmitter.java:265) at org.apache.hadoop.mapreduce.JobSubmitter.copyAndConfigureFiles(JobSubmitter.java:301) at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:389) at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1285) at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1282) at java.security.AccessController.doPrivileged(Native Method) ......复制代码貌似往hdfs上找jar包了,小问题,直接把lib下的jar包上传到hdfs hadoop fs -mkdir -p /home/hadoop/git/hive/packaging/target/apache-hive-0.14.0-SNAPSHOT-bin/apache-hive-0.14.0-SNAPSHOT-bin/lib/ hadoop fs -put $HIVE_HOME/lib/* /home/hadoop/git/hive/packaging/target/apache-hive-0.14.0-SNAPSHOT-bin/apache-hive-0.14.0-SNAPSHOT-bin/lib/ 复制代码接着运行insert,没有问题,接下来测试delete hive>delete from test where id = 1;复制代码报错!:FAILED: SemanticException [Error 10294]: Attempt to do update or delete using transaction manager that does not support these operations.说是在使用的转换管理器不支持update跟delete操作。原来要支持update操作跟delete操作,必须额外再配置一些东西,见:https://cwiki.apache.org/conflue ... tersforTransactions根据提示配置hive-site.xml: hive.support.concurrency – true hive.enforce.bucketing – true hive.exec.dynamic.partition.mode – nonstrict hive.txn.manager – org.apache.hadoop.hive.ql.lockmgr.DbTxnManager hive.compactor.initiator.on – true hive.compactor.worker.threads – 1复制代码配置完以为能够顺利运行了,谁知开始报下面这个错误: FAILED: LockException [Error 10280]: Error communicating with the metastore复制代码与元数据库出现了问题,修改log为DEBUG查看具体错误: 4-11-04 14:20:14,367 DEBUG [Thread-8]: txn.CompactionTxnHandler (CompactionTxnHandler.java:findReadyToClean(265)) - Going to execute query <select cq_id, cq_database, cq_table, cq_partition, cq_type, cq_run_as from COMPACTION_QUEUE where cq_state = 'r'> 2014-11-04 14:20:14,367 ERROR [Thread-8]: txn.CompactionTxnHandler (CompactionTxnHandler.java:findReadyToClean(285)) - Unable to select next element for cleaning, Table 'hive.COMPACTION_QUEUE' doesn't exist 2014-11-04 14:20:14,367 DEBUG [Thread-8]: txn.CompactionTxnHandler (CompactionTxnHandler.java:findReadyToClean(287)) - Going to rollback 2014-11-04 14:20:14,368 ERROR [Thread-8]: compactor.Cleaner (Cleaner.java:run(143)) - Caught an exception in the main loop of compactor cleaner, MetaException(message :Unable to connect to transaction database com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'hive.COMPACTION_QUEUE' doesn't exist at sun.reflect.GeneratedConstructorAccessor19.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:526) at com.mysql.jdbc.Util.handleNewInstance(Util.java:409)复制代码在元数据库中找不到COMPACTION_QUEUE这个表,赶紧去mysql中查看,确实没有这个表。怎么会没有这个表呢?找了很久都没找到什么原因,查源码吧。在org.apache.hadoop.hive.metastore.txn下的TxnDbUtil类中找到了建表语句,顺藤摸瓜,找到了下面这个方法会调用建表语句: private void checkQFileTestHack() { boolean hackOn = HiveConf.getBoolVar(conf, HiveConf.ConfVars.HIVE_IN_TEST) || HiveConf.getBoolVar(conf, HiveConf.ConfVars.HIVE_IN_TEZ_TEST); if (hackOn) { LOG.info("Hacking in canned values for transaction manager"); // Set up the transaction/locking db in the derby metastore TxnDbUtil.setConfValues(conf); try { TxnDbUtil.prepDb(); } catch (Exception e) { // We may have already created the tables and thus don't need to redo it. if (!e.getMessage().contains("already exists")) { throw new RuntimeException("Unable to set up transaction database for" + " testing: " + e.getMessage()); } } } }复制代码什么意思呢,就是说要运行建表语句还有一个条件:HIVE_IN_TEST或者HIVE_IN_TEZ_TEST.只有在测试环境中才能用delete,update操作,也可以理解,毕竟还没有开发完全。终于找到原因,解决方法也很简单:在hive-site.xml中添加下面的配置: <property> <name>hive.in.test</name> <value>true</value> </property>复制代码OK,再重新启动服务,再运行delete: hive>delete from test where id = 1;复制代码又报错: FAILED: SemanticException [Error 10297]: Attempt to do update or delete on table default.test that does not use an AcidOutputFormat or is not bucketed复制代码说是要进行delete操作的表test不是AcidOutputFormat或没有分桶。估计是要求输出是AcidOutputFormat然后必须分桶网上查到确实如此,而且目前只有ORCFileformat支持AcidOutputFormat,不仅如此建表时必须指定参数('transactional' = true)。感觉太麻烦了。。。。于是按照网上示例建表: hive>create table test(id int ,name string )clustered by (id) into 2 buckets stored as orc TBLPROPERTIES('transactional'='true');复制代码insert hive>insert into table test values (1,'row1'),(2,'row2'),(3,'row3');复制代码delete hive>delete from test where id = 1;复制代码update hive>update test set name = 'Raj' where id = 2;复制代码OK!全部顺利运行,不过貌似效率太低了,基本都要30s左右,估计应该可以优化,再研究研究...