我想通过fiware-cygnus将一些数据保存在蜂巢中，
我设置了conf文件，
cygnus-ngsi.sources = http-source
cygnus-ngsi.sinks = hdfs-sink
cygnus-ngsi.channels = hdfs-channel
cygnus-ngsi.sources.http-source.channels = hdfs-channel
cygnus-ngsi.sources.http-source.type = org.apache.flume.source.http.HTTPSource
cygnus-ngsi.sources.http-source.port = 5050
cygnus-ngsi.sources.http-source.handler = com.telefonica.iot.cygnus.handlers.NGSIRestHandler
cygnus-ngsi.sources.http-source.handler.notification_target = /notify
cygnus-ngsi.sources.http-source.handler.default_service = def_serv
cygnus-ngsi.sources.http-source.handler.default_service_path = /def_servpath
cygnus-ngsi.sources.http-source.handler.events_ttl = 2
cygnus-ngsi.sources.http-source.interceptors = ts gi
cygnus-ngsi.sources.http-source.interceptors.ts.type = timestamp
cygnus-ngsi.sources.http-source.interceptors.gi.type = com.telefonica.iot.cygnus.interceptors.NGSIGroupingInterceptor$Builder
cygnus-ngsi.sources.http-source.interceptors.gi.grouping_rules_conf_file = /Applications/apache-flume-1.4.0-bin/conf/grouping_rules.confi
cygnus-ngsi.channels.hdfs-channel.type = memory
cygnus-ngsi.channels.hdfs-channel.capacity = 1000
cygnus-ngsi.channels.hdfs-channel.transactionCapacity = 100
cygnus-ngsi.sinks.hdfs-sink.type = com.telefonica.iot.cygnus.sinks.NGSIHDFSSink
cygnus-ngsi.sinks.hdfs-sink.channel = hdfs-channel
cygnus-ngsi.sinks.hdfs-sink.enable_encoding = true
cygnus-ngsi.sinks.hdfs-sink.enable_grouping = false
cygnus-ngsi.sinks.hdfs-sink.enable_lowercase = false
cygnus-ngsi.sinks.hdfs-sink.enable_name_mappings = false
cygnus-ngsi.sinks.hdfs-sink.data_model = dm-by-entity
cygnus-ngsi.sinks.hdfs-sink.file_format = json-row
cygnus-ngsi.sinks.hdfs-sink.backend.impl = rest
cygnus-ngsi.sinks.hdfs-sink.backend.max_conns = 500
cygnus-ngsi.sinks.hdfs-sink.backend.max_conns_per_route = 100
cygnus-ngsi.sinks.hdfs-sink.hdfs_host = [hdfs_host]
cygnus-ngsi.sinks.hdfs-sink.hdfs_port = 50070
cygnus-ngsi.sinks.hdfs-sink.hdfs_username = [username]
cygnus-ngsi.sinks.hdfs-sink.hdfs_password = [password]
cygnus-ngsi.sinks.hdfs-sink.oauth2_token = [token]
cygnus-ngsi.sinks.hdfs-sink.service_as_namespace = false
cygnus-ngsi.sinks.hdfs-sink.batch_size = 100
cygnus-ngsi.sinks.hdfs-sink.batch_timeout = 30
cygnus-ngsi.sinks.hdfs-sink.batch_ttl = 10
cygnus-ngsi.sinks.hdfs-sink.batch_retry_intervals = 5000
cygnus-ngsi.sinks.hdfs-sink.hive = true
cygnus-ngsi.sinks.hdfs-sink.hive.server_version = 2
cygnus-ngsi.sinks.hdfs-sink.hive.host = [hive_host]
cygnus-ngsi.sinks.hdfs-sink.hive.port = 10000
cygnus-ngsi.sinks.hdfs-sink.hive.db_type = default-db
cygnus-ngsi.sinks.hdfs-sink.krb5_auth = false
我发现创建了HDFS文件，
{"recvx0054imex0054s":"1556776186","recvx0054ime":"2019-05-02T05:49:46.771Z","fiwarex0053ervicex0050ath":"/LightInfo","entityx0049d":"bedroom3_light","entityx0054ype":"Light","attrx004eame":"lux","attrx0054ype":"Float","attrx0056alue":"7","attrx004dd":[]}
{"recvx0054imex0054s":"1556776186","recvx0054ime":"2019-05-02T05:49:46.771Z","fiwarex0053ervicex0050ath":"/LightInfo","entityx0049d":"bedroom3_light","entityx0054ype":"Light","attrx004eame":"status","attrx0054ype":"string","attrx0056alue":"off","attrx004dd":[]}
{"recvx0054imex0054s":"1556776989","recvx0054ime":"2019-05-02T06:03:09.962Z","fiwarex0053ervicex0050ath":"/LightInfo","entityx0049d":"bedroom3_light","entityx0054ype":"Light","attrx004eame":"lux","attrx0054ype":"Float","attrx0056alue":"7","attrx004dd":[]}
{"recvx0054imex0054s":"1556776989","recvx0054ime":"2019-05-02T06:03:09.962Z","fiwarex0053ervicex0050ath":"/LightInfo","entityx0049d":"bedroom3_light","entityx0054ype":"Light","attrx004eame":"status","attrx0054ype":"string","attrx0056alue":"off","attrx004dd":[]}
但是，在配置单元中，所有数据都显示空值。
hive> select * from ngsi_x004cightx002fx004cightx0049nfox002fbedroom_light_x004cight_row;
chmod: changing permissions of 'hdfs://hadoop01:9000/tmp/hive/hive/ae8cd691-6e96-428d-8ece-02f6e6fbf527/hive_2019-05-02_16-37-44_821_8122085527913292696-1/-mr-10001': Permission denied: user=hive, access=EXECUTE, inode="/tmp":hadoop:supergroup:drwx-w----
OK
ngsi_x004cightx002fx004cightx0049nfox002fbedroom_light_x004cight_row.recvx0054imex0054s ngsi_x004cightx002fx004cightx0049nfox002fbedroom_light_x004cight_row.recvx0054ime ngsi_x004cightx002fx004cightx0049nfox002fbedroom_light_x004cight_row.fiwarex0053ervicex0050ath ngsi_x004cightx002fx004cightx0049nfox002fbedroom_light_x004cight_row.entityx0049d ngsi_x004cightx002fx004cightx0049nfox002fbedroom_light_x004cight_row.entityx0054ype ngsi_x004cightx002fx004cightx0049nfox002fbedroom_light_x004cight_row.attrx004eame ngsi_x004cightx002fx004cightx0049nfox002fbedroom_light_x004cight_row.attrx0054ype ngsi_x004cightx002fx004cightx0049nfox002fbedroom_light_x004cight_row.attrx0056alue ngsi_x004cightx002fx004cightx0049nfox002fbedroom_light_x004cight_row.attrx004dd
NULL NULL NULL NULL NULL NULL NULL NULL NULL
NULL NULL NULL NULL NULL NULL NULL NULL NULL
NULL NULL NULL NULL NULL NULL NULL NULL NULL
NULL NULL NULL NULL NULL NULL NULL NULL NULL
Time taken: 0.26 seconds, Fetched: 4 row(s)
Cygnus调试控制台消息中的外部表创建查询是
create external table
if not exists default.ngsi_x004cightx002fx004cightx0049nfox002fbedroom_light_x004cight_row
(recvx0054imex0054s bigint,
recvx0054ime string,
fiwarex0053ervicex0050ath string,
entityx0049d string,
entityx0054ype string,
attrx004eame string,
attrx0054ype string,
attrx0056alue string,
attrx004dd array<struct<name:string,type:string,value:string>>)
row format serde 'org.openx.data.jsonserde.JsonSerDe' with serdeproperties ("dots.in.keys" = "true")
location '/user/ngsi/Light/LightInfo/bedroom_light_Light'
我猜蜂巢表列名称和HDFS文件属性名称之间的区别是问题。 配置单元表列名称使用编码名称，但hdfs文件属性名称使用不编码名称。（例如：recvTimeTs-recvx0054imex0054s）
所以我创建了外部表并进行了测试。
create external table if not exists default.test01 (
recvTimeTs bigint,
recvTime string,
fiwareServicePath string,
entityId string,
entityType string,
attrName string,
attrType string,
attrValue string,
attrMd array<struct<name:string,type:string,value:string>>)
row format serde 'org.openx.data.jsonserde.JsonSerDe' with serdeproperties ("dots.in.keys" = "true")
location '/user/ngsi/Light/LightInfo/bedroom_light_Light'
结果，显示正确的值。
hive> select * from test01;
chmod: changing permissions of 'hdfs://hadoop01:9000/tmp/hive/hive/bec8d67d-7d94-4cdc-a577-14d990ca342c/hive_2019-05-02_16-42-59_290_896718721577759467-1/-mr-10001': Permission denied: user=hive, access=EXECUTE, inode="/tmp":hadoop:supergroup:drwx-w----
OK
1556776186 2019-05-02T05:49:46.771Z /LightInfo bedroom3_light Light lux Float 7 []
1556776186 2019-05-02T05:49:46.771Z /LightInfo bedroom3_light Light status string off []
1556776989 2019-05-02T06:03:09.962Z /LightInfo bedroom3_light Light lux Float 7 []
1556776989 2019-05-02T06:03:09.962Z /LightInfo bedroom3_light Light status string off []
Time taken: 2.329 seconds, Fetched: 4 row(s)
如何在Hive表列名称和HDFS文件属性名称之间进行匹配？
或如何以其他方式使用天鹅座和蜂巢？