python 调用HBase的简单实例
发布时间:2020-12-16 19:52:32 所属栏目:Python 来源:网络整理
导读:新来的一个工程师不懂HBase,java不熟,python还行,我建议他那可以考虑用HBase的thrift调用,完成目前的工作。 首先,安装thrift 下载thrift,这里,我用的是thrift-0.7.0-dev.tar.gz 这个版本 tar xzf thrift-0.7.0-dev.tar.gzcd thrift-0.7.0-devsudo ./c
新来的一个工程师不懂HBase,java不熟,python还行,我建议他那可以考虑用HBase的thrift调用,完成目前的工作。 首先,安装thrift 下载thrift,这里,我用的是thrift-0.7.0-dev.tar.gz 这个版本 tar xzf thrift-0.7.0-dev.tar.gz cd thrift-0.7.0-dev sudo ./configure --with-cpp=no --with-ruby=no sudo make sudo make install 然后,到HBase的源码包里,找到 src/main/resources/org/apache/hadoop/hbase/thrift/ 执行 thrift --gen py Hbase.thrift 我这里写了些调用的脚本,供大家参考 from unittest import TestCase,main from thrift import Thrift from thrift.transport import TSocket from thrift.transport import TTransport from thrift.protocol import TBinaryProtocol from hbase import Hbase from hbase.ttypes import ColumnDescriptor,Mutation,BatchMutation class HBaseTester: def __init__(self,netloc,port,table="staftesttable"): self.tableName = table self.transport = TTransport.TBufferedTransport( TSocket.TSocket(netloc,port)) self.protocol = TBinaryProtocol.TBinaryProtocol(self.transport) self.client = Hbase.Client(self.protocol) self.transport.open() tables = self.client.getTableNames() if self.tableName not in tables: self.__createTable() def __del__(self): self.transport.close() def __createTable(self): name = ColumnDescriptor(name='name') foo = ColumnDescriptor(name='foo') self.client.createTable(self.tableName,[name,foo]) def put(self,key,name,foo): name = Mutation(column="name:v",value=name) foo = Mutation(column="foo:v",value=foo) self.client.mutateRow(self.tablename,foo]) def scanner(self,column): scanner = client.scannerOpen(self.tablename,"",[column]) r = client.scannerGet(scanner) result= [] while r: print r[0] result.append(r[0]) r = client.scannerGet(scanner) print "Scanner finished" return result class TestHBaseTester(TestCase): def setUp(self): self.writer = HBaseTester("localhost",9090) def tearDown(self): name = self.writer.tableName client = self.writer.client client.disableTable(name) client.deleteTable(name) def testCreate(self): tableName = self.writer.tableName client = self.writer.client self.assertTrue(self.writer.tableName in client.getTableNames()) columns =['name:','foo:'] for i in client.getColumnDescriptors(tableName): self.assertTrue(i in columns) def testPut(self): self.writer.put("r1","n1","f1") self.writer.put("r2","n2","f2") self.writer.put("r3","n3","") self.writer.scanner("name:") if __name__ == "__main__": main() 以上这篇python 调用HBase的简单实例就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持编程小技巧。 (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |