我需要将 Cosmos 中的数据保存在 SQL 表而不是 HDFS 文件中。
我在 FI-Lab 的 Cloud 部分部署了一个 VM，在那里我安装了 0.14.0 Orion 版本和 Cygnus 0.3。我已经将 Cygnus 配置为将数据存储在 HDFS 和 SQL 中......问题是，HDFS 文件中的持久性工作正常，但在 SQL 表中这是不可能的，尽管过去我得到了它。这就是为什么我很困惑
我猜如果 HDFS 持久化有效，那应该是 cygnus.config 文件的问题。所以我在下面展示它：
# APACHE_FLUME_HOME/conf/cygnus.conf
# The next tree fields set the sources, sinks and channels used by Cygnus. You could use different names than the
# ones suggested below, but in that case make sure you keep coherence in properties names along the configuration file.
# Regarding sinks, you can use multiple ones at the same time; the only requirement is to provide a channel for each
# one of them (this example shows how to configure 3 sinks at the same time).
cygnusagent.sources = http-source
cygnusagent.sinks = hdfs-sink mysql-sink
cygnusagent.channels = hdfs-channel mysql-channel
#=============================================
# source configuration
# channel name where to write the notification events
cygnusagent.sources.http-source.channels = hdfs-channel mysql-channel
# source class, must not be changed
cygnusagent.sources.http-source.type = org.apache.flume.source.http.HTTPSource
# listening port the Flume source will use for receiving incoming notifications
cygnusagent.sources.http-source.port = 5050
# Flume handler that will parse the notifications, must not be changed
cygnusagent.sources.http-source.handler = es.tid.fiware.fiwareconnectors.cygnus.handlers.OrionRestHandler
# URL target
cygnusagent.sources.http-source.handler.notification_target = /notify
# Default organization (organization semantic depend on the persistence sink)
cygnusagent.sources.http-source.handler.default_organization = org42
# ============================================
# OrionHDFSSink configuration
# channel name from where to read notification events
cygnusagent.sinks.hdfs-sink.channel = hdfs-channel
# sink class, must not be changed
cygnusagent.sinks.hdfs-sink.type = es.tid.fiware.fiwareconnectors.cygnus.sinks.OrionHDFSSink
# The FQDN/IP address of the Cosmos deployment where the notification events will be persisted
cygnusagent.sinks.hdfs-sink.cosmos_host = 130.206.80.46
# port of the Cosmos service listening for persistence operations; 14000 for httpfs, 50070 for webhdfs and free choice for inifinty
cygnusagent.sinks.hdfs-sink.cosmos_port = 14000
# default username allowed to write in HDFS
cygnusagent.sinks.hdfs-sink.cosmos_default_username = quiquehz
# default password for the default username
cygnusagent.sinks.hdfs-sink.cosmos_default_password = 'password'
# HDFS backend type (webhdfs, httpfs or infinity)
cygnusagent.sinks.hdfs-sink.hdfs_api = httpfs
# how the attributes are stored, either per row either per column (row, column)
cygnusagent.sinks.hdfs-sink.attr_persistence = column
# prefix for the database and table names, empty if no prefix is desired
cygnusagent.sinks.hdfs-sink.naming_prefix =
# Hive port for Hive external table provisioning
cygnusagent.sinks.hdfs-sink.hive_port = 10000
# ============================================
# OrionMySQLSink configuration
# channel name from where to read notification events
cygnusagent.sinks.mysql-sink.channel = mysql-channel
# sink class, must not be changed
cygnusagent.sinks.mysql-sink.type = es.tid.fiware.fiwareconnectors.cygnus.sinks.OrionMySQLSink
# the FQDN/IP address where the MySQL server runs
cygnusagent.sinks.mysql-sink.mysql_host = 130.206.80.46
# the port where the MySQL server listes for incomming connections
cygnusagent.sinks.mysql-sink.mysql_port = 3306
# a valid user in the MySQL server
cygnusagent.sinks.mysql-sink.mysql_username = quiquehz
# password for the user above
cygnusagent.sinks.mysql-sink.mysql_password = 'password'
# how the attributes are stored, either per row either per column (row, column)
cygnusagent.sinks.mysql-sink.attr_persistence = column
# prefix for the database and table names, empty if no prefix is desired
cygnusagent.sinks.mysql-sink.naming_prefix =
#=============================================
# hdfs-channel configuration
# channel type (must not be changed)
cygnusagent.channels.hdfs-channel.type = memory
# capacity of the channel
cygnusagent.channels.hdfs-channel.capacity = 1000
# amount of bytes that can be sent per transaction
cygnusagent.channels.hdfs-channel.transactionCapacity = 100
#=============================================
# mysql-channel configuration
# channel type (must not be changed)
cygnusagent.channels.mysql-channel.type = memory
# capacity of the channel
cygnusagent.channels.mysql-channel.capacity = 1000
# amount of bytes that can be sent per transaction
cygnusagent.channels.mysql-channel.transactionCapacity = 100