这是用于连接我们的配置单元数据库的代码，一周前运行良好，但现在似乎连打开会话和获取游标来执行查询都失败了。当我显式添加cursor.close（）方法时，这个问题暂时得到了解决，但现在又回来了。我无法使用python访问配置单元数据库
我尝试过使用pyhs2和pyhive这两个库都无法连接到hive数据库。到目前为止，集群没有任何变化。为什么会这样？
我知道hive不是关系数据库，所以游标的概念没有意义，但是hive数据库有没有办法记住使用pyhive库创建的游标？？如果是这样，我如何删除当前未使用的光标？？
下面是它在执行时引发的代码和异常

from pyhive import hive
import contextlib

class Hive():
    def __init__(self,host="[hostnamehere]",db="default",port="10000",auth="KERBEROS",kerberos_service_name="hive"):
        self.host = host
        self.db = db
        self.port = port
        self.auth = auth
        self.kerberos_service_name = kerberos_service_name

    def connect(self):
        return(hive.connect(host=self.host, port=self.port, database=self.db, auth=self.auth, kerberos_service_name=self.kerberos_service_name))

    def query_one(self,sql):
        with contextlib.closing(self.connect()) as connection:
            with contextlib.closing(connection.cursor()) as cursor:
                cursor.execute(sql)
                result = cursor.fetch_one()
                cursor.close()
        return(result)

if __name__ == "__main__":
    connector = Hive()
    print("running query")
    print(connector.query_one("SELECT * FROM [tablenamehere]"))

raise operationalerror（response）pyhive.exc.operationalerror:topensessionresp（状态=tstatus（状态码=3，信息消息=['*org.apache.hive.service.cli.hivesqlexception:failed to 打开新会话：java.lang.runtimeexception:java.lang.runtimeexception:无法示例化org.apache.hadoop.hive.ql.metadata.sessionhivemetastoreclient:13:12','org.apache.hive.service.cli.session.sessionmanager:opensession：会话管理器。java:289'，'org.apache.hive.service.cli.cliservice:opensession：cliservice。java:199'，'org.apache.hive.service.cli.thrift.thriftcliservice:getsessionhandle：节俭服务。java:427','org.apache.hive.service.cli.thrift.thriftcliservice:opensession：节俭服务。java:319'，'org.apache.hive.service.cli.thrift.tcliservice$processor$opensession:getresult：t仪器。java:1257'，'org.apache.hive.service.cli.thrift.tcliservice$processor$opensession:getresult：t仪器。java:1242','org.apache.thrift.proces.'sfunction:process：processfunction。java:39'，'org.apache.thrift.tbaseprocessor:process：t基础处理器。java:39'，'org.apache.hadoop.hive.thrift.hadoopthriftauthbridge$server$tugiasumingprocessor:process：hadoopthriftauthbridge。java:562','org.apache.thrift.server.tthreadpoolserver$工作erprocess:run：t线程池服务器。java:286'，'java.util.concurrent.threadpoolexecutor:runworker：threadpoolexecutor。java:1149'，'java.util.concurrent.threadpoolexecutor$worker:run：threadpoolexecutor。java:624'，'java.lang。thread:run：线程。java:748','*java.lang.runtimeexception:java.lang.runtimeexception：无法示例化org.apache.hadoop.hive.ql.metadata.sessionhivemetastoreclient:15：2'，org.apache.hadoop.hive.ql.session.sessionstate:start：会话状态。java:547'，'org.apache.hive.service.cli.session.hivesessionimpl:open：hivesessionimpl。java:144','org.apache.hive.service.cli.session.sessionmanager:opensession：会话管理器。java:281'，'*java.lang.runtimeexception:unable to 示例化org.apache.hadoop.hive.ql.metadata.sessionhivemetastoreclient:21：6'，'org.apache.hadoop.hive.metastore.metastoreutils:newinstance：metastoreutils。java:1566','org.apache.hadoop.hive.metastore.retryingmetastoreclient:：retryingmetastoreclient。java:92'，'org.apache.hadoop.hive.metastore.retryingmetastoreclient:getproxy：正在重试MetaStoreClient。java:138'，'org.apache.hadoop.hive.metastore.retryingmetastoreclient:getproxy：正在重试MetaStoreClient。java:110','org.apache.hadoop.hive.ql.metadata。hive:createmetastoreclient：Hive。java:3510'，'org.apache.hadoop.hive.ql.metadata。hive:getmsc：Hive。java:3542'，'org.apache.hadoop.hive.ql.session.sessionstate:start：会话状态。java:528'，'*java.lang.reflect.invocationtargetexception:null:25:4','sun.reflect.nativeconstructoracc'essorimpl:newinstance0：NativeConstructor附件模板。java:-2'，'sun.reflect.nativeconstructoraccessorimpl:newinstance：NativeConstructor附件模板。java:62'，'sun.reflect.delegatingconstructoraccessorimpl:newinstance：delegatingconstructoraccessorimpl。java:45','java.lang.reflect.constructor:newinstance：构造函数。java:423'，'org.apache.hadoop.hive.metastore.metastoreutils:newinstance：metastoreutils。java:1564'，'*org.apache.hadoop.hive.metastore.api.metaexception:gc overhead 限制exceeded:30：4'，org.apache.hadoop.hive.metastore.retryinghmshandler:：retryinghmshandler。java:82','org.apache.hadoop.hive.metastore.retryingh'mshandler:getproxy：重试hmshandler。java:91'，'org.apache.hadoop.hive.metastore.hivemetastore:newretryinghmshandler：hivemetastore。java:6463'，'org.apache.hadoop.hive.metastore.hivemetastoreclient:：hivemetastoreclient。java:206','org.apache.hadoop.hive.ql.metadata.sessionhivemetastoreclient:：sessionhivemetastoreclient。java:76'，'*java.lang.outofmemoryerror:gc overhead 限制exceeded:0：-1']，sqlstate=none，errorcode=0，errormessage='failed to open new session:java.lang.runtimeexception:java.lang.runtimeexception:unable to instantiate org.apache.hadoop.hive.ql.metadata.sessionhivemetastoreclient'），serverprotocolversion=7，sessionhandle=none，configuration=none）