【hbase】使用thrift with python 访问HBase

时间：2021-04-01 17:14:09

HBase 版本： 0.98.6

thrift   版本： 0.9.0

使用 thrift client with python 连接 HBase 报错：

 Traceback (most recent call last):

   File "D:\workspace\Python\py\helloworld.py", line 27, in <module>

     tables = client.getTableNames()

   File "E:\mazhongsoft\python\lib\hbase\Hbase.py", line 788, in getTableNames

     return self.recv_getTableNames()

   File "E:\mazhongsoft\python\lib\hbase\Hbase.py", line 798, in recv_getTableNames

     (fname, mtype, rseqid) = self._iprot.readMessageBegin()

   File "E:\mazhongsoft\python\lib\thrift\protocol\TBinaryProtocol.py", line 126, in readMessageBegin

     sz = self.readI32()

   File "E:\mazhongsoft\python\lib\thrift\protocol\TBinaryProtocol.py", line 203, in readI32

     buff = self.trans.readAll(4)

   File "E:\mazhongsoft\python\lib\thrift\transport\TTransport.py", line 58, in readAll

     chunk = self.read(sz-have)

   File "E:\mazhongsoft\python\lib\thrift\transport\TTransport.py", line 155, in read

     self.__rbuf = StringIO(self.__trans.read(max(sz, self.DEFAULT_BUFFER)))

   File "E:\mazhongsoft\python\lib\thrift\transport\TSocket.py", line 94, in read

     raise TTransportException('TSocket read 0 bytes')

 thrift.transport.TTransport.TTransportException: None

查找原因，过程如下：
1） 客户端代码

1 transport = TTransport.TBufferedTransport(TSocket('192.168.0.10', 9090))

 protocol = TBinaryProtocol.TBinaryProtocol(transport)

 client = Hbase.Client(protocol)

 transport.open()

2） hbase-site.xml 配置如下

   <property>

      <name>hbase.regionserver.thrift.framed</name>

      <value>true</value>

   </property>

   <property>

      <name>hbase.regionserver.thrift.compact</name>

      <value>true</value>

   </property>

3） thrift server日志如下：（/var/log/hbase/hbase-hbase-thrift-<hostname>.log）

 Wed Jan 14 14:54:43 CST 2015 Starting thrift on <hostname>

 core file size          (blocks, -c) 0

 data seg size           (kbytes, -d) unlimited

 scheduling priority             (-e) 0

 file size               (blocks, -f) unlimited

 pending signals                 (-i) 191956

 max locked memory       (kbytes, -l) unlimited

 max memory size         (kbytes, -m) unlimited

 open files                      (-n) 32768

 pipe size            (512 bytes, -p) 8

 POSIX message queues     (bytes, -q) 819200

 real-time priority              (-r) 0

 stack size              (kbytes, -s) 10240

 cpu time               (seconds, -t) unlimited

 max user processes              (-u) 1024

 virtual memory          (kbytes, -v) unlimited

 file locks                      (-x) unlimited

 INFO  [main] util.VersionInfo: HBase 0.98.6-cdh5.3.0

 INFO  [main] util.VersionInfo: Subversion file:///data/jenkins/workspace/generic-package-rhel64-6-0/topdir/BUILD/hbase-0.98.6-cdh5.3.0 -r Unknown

 INFO  [main] util.VersionInfo: Compiled by jenkins on Tue Dec 16 19:13:29 PST 2014

 INFO  [main] thrift.ThriftServerRunner: Using default thrift server type

 INFO  [main] thrift.ThriftServerRunner: Using thrift server type threadpool

 INFO  [main] impl.MetricsConfig: loaded properties from hadoop-metrics2-hbase.properties

 INFO  [main] impl.MetricsSystemImpl: Scheduled snapshot period at 10 second(s).

 INFO  [main] impl.MetricsSystemImpl: HBase metrics system started

 INFO  [main] mortbay.log: Logging to org.slf4j.impl.Log4jLoggerAdapter(org.mortbay.log) via org.mortbay.log.Slf4jLog

 INFO  [main] http.HttpServer: Added global filter 'safety' (class=org.apache.hadoop.http.HttpServer$QuotingInputFilter)

28 INFO  [main] http.HttpServer: Added filter static_user_filter (class=org.apache.hadoop.http.lib.StaticUserWebFilter$StaticUserFilter) to context thrift

 INFO  [main] http.HttpServer: Added filter static_user_filter (class=org.apache.hadoop.http.lib.StaticUserWebFilter$StaticUserFilter) to context static

 INFO  [main] http.HttpServer: Jetty bound to port 9095

 INFO  [main] mortbay.log: jetty-6.1.26.cloudera.4

 INFO  [main] mortbay.log: Started HttpServer$SelectChannelConnectorWithSafeStartup@0.0.0.0:9095

 DEBUG [main] thrift.ThriftServerRunner: Using compact protocol

 DEBUG [main] thrift.ThriftServerRunner: Using framed transport

 INFO  [main] thrift.ThriftServerRunner: starting TBoundedThreadPoolServer on /0.0.0.0:9090; min worker threads=16, max worker threads=1000, max queued requests=1000

由以上红色文字部分可知，是因为thrift 的server端和client端的协议不匹配造成的。

解决方案有如下两个：
方案一：修改hbase-site.xml，禁用TFramedTransport和TCompactProtocol功能，即：

   <property>

      <name>hbase.regionserver.thrift.framed</name>

      <value>false</value>

   </property>

   <property>

      <name>hbase.regionserver.thrift.compact</name>

      <value>false</value>

   </property>

重启thrift 服务器： service hbase-thrift restart

方案二：修改客户端代码

 transport = TFramedTransport(TSocket('192.168.0.10', 9090))

 protocol = TCompactProtocol.TCompactProtocol(transport)

 client = Hbase.Client(protocol)

 transport.open()

如果报错未找到TFramedTransport和TCompactProtocol，请查看/usr/lib/python2.6/site-packages/thrift目录下有没有protocol/TCompactProtocol.py文件，检查transport/TTransport.py文件中有没有类TFramedTransport。如果没有，可以在thrift官网下载源码包 thrift-0.9.2.tar.gz，用其中的lib/py/src/覆盖/usr/lib/python2.6/site-packages/thrift/目录即可。

相关文章