【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。