加载中…impala常见错误小结
(2016-09-28 11:51:43)
标签：
impala |
分类： 大数据 |
部署常见问题：
1.mysql
jar错误
Caused by:
org.datanucleus.exceptions.NucleusException: Attempt to invoke the
"DBCP" plugin to create a ConnectionPool gave an error : The
specified datastore driver ("com.mysql.jdbc.Driver") was not found
in the CLASSPATH. Please check your CLASSPATH specification, and
the name of the driver.
拷贝hive的mysql-connector-
2.hdfs
namenode错误
E0127
19:48:16.708744 31675 impala-server.cc:339] Could not read the HDFS
root directory at hdfs://bipcluster. Error was:
Operation category READ is not supported in state standby
Operation category READ is not supported in state standby
namenode
ha没有自动开启，导致两个namenode都在standby状态。
手动设置为active状态即可。
3.impala特性支持
E0127
19:28:25.289991 13469 impala-server.cc:339] ERROR: short-circuit
local reads is disabled because
ERROR: block location tracking is not properly enabled because
E0127 19:28:25.290117 13469 impala-server.cc:341] Aborting Impala Server startup due to improper configuration
hdfs的配置文件hdfs-site.xml增加如下内容：
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<</code>
<</code>
<</code>
</</code>
<</code>
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使用常见错误：
4.创建表错误
impala默认使用impala用户运行，创建表时，会由于hdfs权限导致创建报错
Query:
create table nginx_test (line string) STORED AS TEXTFILE
ERROR: MetaException: Got exception: org.apache.hadoop.security.AccessControlException Permission denied: user=impala, access=WRITE, inode="/bip/hive_warehouse/cdnlog.db":hdfs:hdfs:drwxr-xr-x
ERROR: MetaException: Got exception: org.apache.hadoop.security.AccessControlException Permission denied: user=impala, access=WRITE, inode="/bip/hive_warehouse/cdnlog.db":hdfs:hdfs:drwxr-xr-x
5.查询出错
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ERROR: Failed to open HDFS file hdfs://bipcluster/bip/hive_warehouse/cdnlog.db/dd_log/dt=20140117/data.file
Error(255):
Unknown error 255
hdfsOpenFile(hdfs://bipcluster/bip/hive_warehouse/cdnlog.db/dd_log/dt=20140117/data.file):
FileSystem#open((Lorg/apache/hadoop/fs/Path;I)Lorg/apache/hadoop/fs/FSDataInputStream;)
error:
java.io.IOException: Filesystem closed
at
org.apache.hadoop.hdfs.DFSClient.checkOpen(DFSClient.java:565)
at
org.apache.hadoop.hdfs.DFSClient.open(DFSClient.java:1115)
at
org.apache.hadoop.hdfs.DistributedFileSystem.open(DistributedFileSystem.java:249)
at
org.apache.hadoop.hdfs.DistributedFileSystem.open(DistributedFileSystem.java:82) |
报hdfs文件打开错误，通过hadoop
fs -cat可以查看文件内容，即impala和datanode通讯出错，重启impala进程即可
6.
1)hive有隐式转换的功能，可以直接avg(string字段)（如果是数字型的值），impala的话需要手动cast
比如下面这个：
[10.19.111.106:21000]
> select avg(status) from dd_log where dt='20140117';
Query: select avg(status) from dd_log where dt='20140117'
ERROR: AnalysisException: AVG requires a numeric or timestamp parameter: AVG(status)
Query: select avg(status) from dd_log where dt='20140117'
ERROR: AnalysisException: AVG requires a numeric or timestamp parameter: AVG(status)
可以通过下面的方式运行：
select
avg(cast(status as DOUBLE)) from dd_log where
dt='20140117';
2)ERROR:
NotImplementedException: ORDER BY without LIMIT currently not
supported
impala中order
by 需要limit的限制才可以运行，否则报错，可以通过limit一个很大的值来查看所有的数据，另外limit不支持 limit
a,b这种格式。
select
ip,count(1) as cnt from cdnlog.dd_log group by ip order by cnt desc
limit 100000000;
7.impala
1.0升级到1.1.1的问题
1)1.0的客户端和1.1的服务端不兼容，用1.0的客户端连接1.1的server后执行refresh会报错ERROR:
ExecPlanRequest rpcERROR
2)1.1的Refresh行为改变了，1.0的Refresh等同于1.1的Invalid
Metadata [Tablename]，而1.1的Refresh后面必须加表名
可以在impala-shell中使用-r参数refresh
metadata.
3)1.1的客户端-o选项的默认行为也发生改变了，1.0输出到文件的格式是value逗号value，而在1.1必须显示指定-B
--output_delimiter=,
4)1.1的server端与1.0的statestore不兼容，无法注册成功
8.Could
not resolve host for clientsocket
datanode的hosts解析问题
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