测试flume，将数据送到hive表中，首先建表。
create table order_flume( order_id string, user_id string, eval_set string, order_number string, order_dow string, order_hour_of_day string, days_since_prior_order string) clustered by (order_id) into 5 buckets stored as orc; # 记得加 orc，不然后面会出错
flume conf 配置如下：
# Name the components on this agent a1.sources = r1 a1.sinks = k1 a1.channels = c1 # Describe/configure the source a1.sources.r1.type = exec a1.sources.r1.command = tail -f /root/code/flume_exec_test.txt # Describe the sink a1.sinks.k1.type = hive a1.sinks.k1.hive.metastore = thrift://master:9083 a1.sinks.k1.hive.database = hw a1.sinks.k1.hive.table = order_flume a1.sinks.k1.serializer = DELIMITED a1.sinks.k1.serializer.delimiter = "," a1.sinks.k1.serializer.serdeSeparator = ',' a1.sinks.k1.serializer.fieldnames = order_id,user_id,eval_set,order_number,order_dow,order_hour_of_day,days_since_prior_order # Use a channel which buffers events in memory a1.channels.c1.type = memory a1.channels.c1.capacity = 10000 # 设置大一点，默认是1000 a1.channels.c1.transactionCapacity = 1000 # 设置大一点，默认是100 # Bind the source and sink to the channel a1.sources.r1.channels = c1 a1.sinks.k1.channel = c1
这个时候如果启动flume的话会报错，需要将hive中的jar包移动到flume 中。
/usr/local/src/apache-hive-1.2.2-bin/hcatalog/share/hcatalog/* $FLUME_HOME/lib /usr/local/src/apache-hive-1.2.2-bin/lib/* $FLUME_HOME/lib
此时，在修改修改 hive-site.xml，将下面的值进行修改。
<property> <name>hive.support.concurrency</name> <value>true</value> </property> <property> <name>hive.exec.dynamic.partition.mode</name> <value>nonstrict</value> </property> <property> <name>hive.txn.manager</name> <value>org.apache.hadoop.hive.ql.lockmgr.DbTxnManager</value> </property> <property> <name>hive.compactor.initiator.on</name> <value>true</value> </property> <property> <name>hive.compactor.worker.threads</name> <value>1</value> </property>
上面的配置完成之后，先启动 hive metastore，在启动 flume。
# 一定要重启 # 先重启 mysql # 再重启 hadoop # 再启动 hive metstore # 再启动 flume service mysql restart start-dfs.sh start-yarn.sh hive --service metastore flume-ng agent -c conf -f conf/hive.conf -n a1 -Dflume.root.logger=INFO,console
一开始调试的时候，配置的都是对的，无论怎么跑都是连不上，都提示失败。
org.apache.flume.sink.hive.HiveWriter$ConnectException: Failed connecting to EndPoint {metaStoreUri='thrift://master:9083', database='hw', table='order_flume', partitionVals=[] }
at org.apache.flume.sink.hive.HiveWriter.<init>(HiveWriter.java:99)
at org.apache.flume.sink.hive.HiveSink.getOrCreateWriter(HiveSink.java:343)
at org.apache.flume.sink.hive.HiveSink.drainOneBatch(HiveSink.java:295)
at org.apache.flume.sink.hive.HiveSink.process(HiveSink.java:253)
at org.apache.flume.sink.DefaultSinkProcessor.process(DefaultSinkProcessor.java:67)
at org.apache.flume.SinkRunner$PollingRunner.run(SinkRunner.java:145)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.flume.sink.hive.HiveWriter$TxnBatchException: Failed acquiring Transaction Batch from EndPoint: {metaStoreUri='thrift://master:9083', database='hw', table='oreder_flume', partitionVals=[] }
at org.apache.flume.sink.hive.HiveWriter.nextTxnBatch(HiveWriter.java:400)
at org.apache.flume.sink.hive.HiveWriter.<init>(HiveWriter.java:90)
... 6 more
Caused by: org.apache.hive.hcatalog.streaming.TransactionBatchUnAvailable: Unable to acquire transaction batch on end point: {metaStoreUri='thrift://master:9083', database='hw', table='order_flume', partitionVals=[] }
at org.apache.hive.hcatalog.streaming.HiveEndPoint$TransactionBatchImpl.<init>(HiveEndPoint.java:514)
at org.apache.hive.hcatalog.streaming.HiveEndPoint$TransactionBatchImpl.<init>(HiveEndPoint.java:464)
at org.apache.hive.hcatalog.streaming.HiveEndPoint$ConnectionImpl.fetchTransactionBatchImpl(HiveEndPoint.java:351)
at org.apache.hive.hcatalog.streaming.HiveEndPoint$ConnectionImpl.fetchTransactionBatch(HiveEndPoint.java:331)
at org.apache.flume.sink.hive.HiveWriter$9.call(HiveWriter.java:395)
at org.apache.flume.sink.hive.HiveWriter$9.call(HiveWriter.java:392)
at org.apache.flume.sink.hive.HiveWriter$11.call(HiveWriter.java:428)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
... 1 more
Caused by: org.apache.thrift.TApplicationException: Internal error processing open_txns
at org.apache.thrift.TApplicationException.read(TApplicationException.java:111)
at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:79)
at org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore$Client.recv_open_txns(ThriftHiveMetastore.java:4195)
at org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore$Client.open_txns(ThriftHiveMetastore.java:4182)
at org.apache.hadoop.hive.metastore.HiveMetaStoreClient.openTxns(HiveMetaStoreClient.java:1988)
at org.apache.hive.hcatalog.streaming.HiveEndPoint$TransactionBatchImpl.openTxnImpl(HiveEndPoint.java:523)
at org.apache.hive.hcatalog.streaming.HiveEndPoint$TransactionBatchImpl.<init>(HiveEndPoint.java:507)
... 10 more
重启了几次还是同样的错误，后面尝试先启动 hive，去看一下其中表的情况，发现启动hive失败。
FAILED: LockException [Error 10280]: Error communicating with the metastore
再次尝试重启 metastore，在尝试启动 hive，一开始尝试2次，发现还是同样的错误，结果过了几分钟，再次重新启动后，发现它自己好了，一直没有弄明白为什么，可能是之前没重启成功，重新编辑一下 hive-site.xml文件，在次保存退出，在重启可能会好。
最终flume 链接 hive 成功，信息如下。
2019-07-20 12:26:28,968 (SinkRunner-PollingRunner-DefaultSinkProcessor) [INFO - org.apache.flume.sink.hive.HiveSink.getOrCreateWriter(HiveSink.java:342)] k1: Creating Writer to Hive end point : {metaStoreUri='thrift://master:9083', database='hw', table='order_flume', partitionVals=[] }
2019-07-20 12:26:30,747 (hive-k1-call-runner-0) [INFO - org.apache.hadoop.hive.metastore.HiveMetaStoreClient.open(HiveMetaStoreClient.java:377)] Trying to connect to metastore with URI thrift://master:9083
2019-07-20 12:26:30,865 (hive-k1-call-runner-0) [INFO - org.apache.hadoop.hive.metastore.HiveMetaStoreClient.open(HiveMetaStoreClient.java:473)] Connected to metastore.
2019-07-20 12:26:31,494 (SinkRunner-PollingRunner-DefaultSinkProcessor) [INFO - org.apache.hadoop.hive.metastore.HiveMetaStoreClient.open(HiveMetaStoreClient.java:377)] Trying to connect to metastore with URI thrift://master:9083
2019-07-20 12:26:31,516 (SinkRunner-PollingRunner-DefaultSinkProcessor) [INFO - org.apache.hadoop.hive.metastore.HiveMetaStoreClient.open(HiveMetaStoreClient.java:473)] Connected to metastore.
2019-07-20 12:26:35,677 (SinkRunner-PollingRunner-DefaultSinkProcessor) [INFO - org.apache.flume.sink.hive.HiveWriter.nextTxnBatch(HiveWriter.java:335)] Acquired Txn Batch TxnIds=[1...100] on endPoint = {metaStoreUri='thrift://master:9083', database='hw', table='order_flume', partitionVals=[] }. Switching to first txn
2019-07-20 12:26:38,808 (SinkRunner-PollingRunner-DefaultSinkProcessor) [INFO - org.apache.flume.sink.hive.HiveWriter.commitTxn(HiveWriter.java:275)] Committing Txn 1 on EndPoint: {metaStoreUri='thrift://master:9083', database='hw', table='order_flume', partitionVals=[] }