【hbase】使用thrift with python 访问HBase

HBase 版本： 0.98.6

thrift   版本： 0.9.0

使用 thrift client with python 连接 HBase 报错：

 1 Traceback (most recent call last):
 2   File "D:\workspace\Python\py\helloworld.py", line 27, in <module>
 3     tables = client.getTableNames()
 4   File "E:\mazhongsoft\python\lib\hbase\Hbase.py", line 788, in getTableNames
 5     return self.recv_getTableNames()
 6   File "E:\mazhongsoft\python\lib\hbase\Hbase.py", line 798, in recv_getTableNames
 7     (fname, mtype, rseqid) = self._iprot.readMessageBegin()
 8   File "E:\mazhongsoft\python\lib\thrift\protocol\TBinaryProtocol.py", line 126, in readMessageBegin
 9     sz = self.readI32()
10   File "E:\mazhongsoft\python\lib\thrift\protocol\TBinaryProtocol.py", line 203, in readI32
11     buff = self.trans.readAll(4)
12   File "E:\mazhongsoft\python\lib\thrift\transport\TTransport.py", line 58, in readAll
13     chunk = self.read(sz-have)
14   File "E:\mazhongsoft\python\lib\thrift\transport\TTransport.py", line 155, in read
15     self.__rbuf = StringIO(self.__trans.read(max(sz, self.DEFAULT_BUFFER)))
16   File "E:\mazhongsoft\python\lib\thrift\transport\TSocket.py", line 94, in read
17     raise TTransportException(‘TSocket read 0 bytes‘)
18 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))
2 protocol = TBinaryProtocol.TBinaryProtocol(transport)
3 client = Hbase.Client(protocol)
4 transport.open()

2） hbase-site.xml 配置如下

1   <property>
2      <name>hbase.regionserver.thrift.framed</name>
3      <value>true</value>
4   </property>
5   <property>
6      <name>hbase.regionserver.thrift.compact</name>
7      <value>true</value>
8   </property>

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

 1 Wed Jan 14 14:54:43 CST 2015 Starting thrift on <hostname>
 2 core file size          (blocks, -c) 0
 3 data seg size           (kbytes, -d) unlimited
 4 scheduling priority             (-e) 0
 5 file size               (blocks, -f) unlimited
 6 pending signals                 (-i) 191956
 7 max locked memory       (kbytes, -l) unlimited
 8 max memory size         (kbytes, -m) unlimited
 9 open files                      (-n) 32768
10 pipe size            (512 bytes, -p) 8
11 POSIX message queues     (bytes, -q) 819200
12 real-time priority              (-r) 0
13 stack size              (kbytes, -s) 10240
14 cpu time               (seconds, -t) unlimited
15 max user processes              (-u) 1024
16 virtual memory          (kbytes, -v) unlimited
17 file locks                      (-x) unlimited
18 INFO  [main] util.VersionInfo: HBase 0.98.6-cdh5.3.0
19 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
20 INFO  [main] util.VersionInfo: Compiled by jenkins on Tue Dec 16 19:13:29 PST 2014
21 INFO  [main] thrift.ThriftServerRunner: Using default thrift server type
22 INFO  [main] thrift.ThriftServerRunner: Using thrift server type threadpool
23 INFO  [main] impl.MetricsConfig: loaded properties from hadoop-metrics2-hbase.properties
24 INFO  [main] impl.MetricsSystemImpl: Scheduled snapshot period at 10 second(s).
25 INFO  [main] impl.MetricsSystemImpl: HBase metrics system started
26 INFO  [main] mortbay.log: Logging to org.slf4j.impl.Log4jLoggerAdapter(org.mortbay.log) via org.mortbay.log.Slf4jLog
27 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
29 INFO  [main] http.HttpServer: Added filter static_user_filter (class=org.apache.hadoop.http.lib.StaticUserWebFilter$StaticUserFilter) to context static
30 INFO  [main] http.HttpServer: Jetty bound to port 9095
31 INFO  [main] mortbay.log: jetty-6.1.26.cloudera.4
32 INFO  [main] mortbay.log: Started [email protected]:9095
33 DEBUG [main] thrift.ThriftServerRunner: Using compact protocol
34 DEBUG [main] thrift.ThriftServerRunner: Using framed transport
35 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：

1   <property>
2      <name>hbase.regionserver.thrift.framed</name>
3      <value>false</value>
4   </property>
5   <property>
6      <name>hbase.regionserver.thrift.compact</name>
7      <value>false</value>
8   </property>

重启thrift 服务器： service hbase-thrift restart

方案二：修改客户端代码

1 transport = TFramedTransport(TSocket(‘192.168.0.10‘, 9090))
2 protocol = TCompactProtocol.TCompactProtocol(transport)
3 client = Hbase.Client(protocol)
4 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。