1）SecureCRT 7.3出現亂碼或者删除不掉資料，免安裝版的SecureCRT 解除安裝或者用虛拟機直接操作或者換安裝版的SecureCRT

2）連接配接不上mysql資料庫

（1）導錯驅動包，應該把mysql-connector-java-5.1.27-bin.jar導入/opt/module/hive/lib的不是這個包。錯把mysql-connector-java-5.1.27.tar.gz導入hive/lib包下。

（2）修改user表中的主機名稱沒有都修改為%，而是修改為localhost

3）hive預設的輸入格式處理是CombineHiveInputFormat，會對小檔案進行合并。

hive (default)> set hive.input.format;

hive.input.format=org.apache.hadoop.hive.ql.io.CombineHiveInputFormat

可以采用HiveInputFormat就會根據分區數輸出相應的檔案。

hive (default)> set hive.input.format=org.apache.hadoop.hive.ql.io.HiveInputFormat;

4）不能執行mapreduce程式

可能是hadoop的yarn沒開啟。

5）啟動mysql服務時，報MySQL server PID file could not be found! 異常。

在/var/lock/subsys/mysql路徑下建立hadoop102.pid，并在檔案中添加内容：4396

6）報service mysql status MySQL is not running, but lock file (/var/lock/subsys/mysql[失敗])異常。

解決方案：在/var/lib/mysql 目錄下建立： -rw-rw----. 1 mysql mysql 5 12月 22 16:41 hadoop102.pid 檔案，并修改權限為 777。

7）JVM堆記憶體溢出

描述：java.lang.OutOfMemoryError: Java heap space

解決：在yarn-site.xml中加入如下代碼

yarn.scheduler.maximum-allocation-mb 2048 yarn.scheduler.minimum-allocation-mb 2048 yarn.nodemanager.vmem-pmem-ratio 2.1 mapred.child.java.opts -Xmx1024m

8、執行/usr/bin/hive指令進入hive時遇到如下錯誤：

Logging initialized using configuration in jar:file:/opt/cloudera/parcels/CDH-5.7.3-1.cdh5.7.3.p0.5/jars/hive-common-1.1.0-cdh5.7.3.jar!/hive-log4j.properties

Exception in thread “main” java.lang.RuntimeException: java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient

at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:540)

at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:689)

at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:628)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:606)

at org.apache.hadoop.util.RunJar.run(RunJar.java:221)

at org.apache.hadoop.util.RunJar.main(RunJar.java:136)

Caused by: java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient

at org.apache.hadoop.hive.metastore.MetaStoreUtils.newInstance(MetaStoreUtils.java:1493)

at org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.(RetryingMetaStoreClient.java:67)

at org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.getProxy(RetryingMetaStoreClient.java:82)

at org.apache.hadoop.hive.ql.metadata.Hive.createMetaStoreClient(Hive.java:2935)

at org.apache.hadoop.hive.ql.metadata.Hive.getMSC(Hive.java:2954)

at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:513)

… 8 more

Caused by: java.lang.reflect.InvocationTargetException

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

at java.lang.reflect.Constructor.newInstance(Constructor.java:526)

at org.apache.hadoop.hive.metastore.MetaStoreUtils.newInstance(MetaStoreUtils.java:1491)

… 13 more

Caused by: MetaException(message:Could not connect to meta store using any of the URIs provided. Most recent failure: org.apache.thrift.transport.TTransportException: java.net.ConnectException: Connection refused

at org.apache.thrift.transport.TSocket.open(TSocket.java:187)

at org.apache.hadoop.hive.metastore.HiveMetaStoreClient.open(HiveMetaStoreClient.java:427)

at org.apache.hadoop.hive.metastore.HiveMetaStoreClient.(HiveMetaStoreClient.java:237)

at org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient.(SessionHiveMetaStoreClient.java:74)