添加种子\u提供程序时，Cassandra.yaml出现无效错误

我只是尝试将ip添加到cassandra.yaml中的seed_provider选项中，但只要我这样做并且不更改任何其他内容，我就会得到以下错误：

The document is not valid YAML:
while parsing a block mapping
  in "", line 10, column 1:
    cluster_name: 'Test Cluster'
    ^
expected , but found ''
  in "", line 223, column 5:
        - class_name: org.apache.cassand ... 

这是我能容纳的尽可能多的cassandra.yaml：

# Cassandra storage config YAML 

# NOTE:
#   See http://wiki.apache.org/cassandra/StorageConfiguration for
#   full explanations of configuration directives
# /NOTE

# The name of the cluster. This is mainly used to prevent machines in
# one logical cluster from joining another.
cluster_name: 'Test Cluster'

# This defines the number of tokens randomly assigned to this node on the ring
# The more tokens, relative to other nodes, the larger the proportion of data
# that this node will store. You probably want all nodes to have the same number
# of tokens assuming they have equal hardware capability.
#
# If you leave this unspecified, Cassandra will use the default of 1 token for legacy compatibility,
# and will use the initial_token as described below.
#
# Specifying initial_token will override this setting.
#
# If you already have a cluster with 1 token per node, and wish to migrate to 
# multiple tokens per node, see http://wiki.apache.org/cassandra/Operations
num_tokens: 256

# initial_token allows you to specify tokens manually.  While you can use # it with
# vnodes (num_tokens > 1, above) -- in which case you should provide a 
# comma-separated list -- it's primarily used when adding nodes # to legacy clusters 
# that do not have vnodes enabled.
# initial_token:

# May either be "true" or "false" to enable globally, or contain a list
# of data centers to enable per-datacenter.
# hinted_handoff_enabled: DC1,DC2
# See http://wiki.apache.org/cassandra/HintedHandoff
hinted_handoff_enabled: true
# this defines the maximum amount of time a dead host will have hints
# generated.  After it has been dead this long, new hints for it will not be
# created until it has been seen alive and gone down again.
max_hint_window_in_ms: 10800000 # 3 hours
# Maximum throttle in KBs per second, per delivery thread.  This will be
# reduced proportionally to the number of nodes in the cluster.  (If there
# are two nodes in the cluster, each delivery thread will use the maximum
# rate; if there are three, each will throttle to half of the maximum,
# since we expect two nodes to be delivering hints simultaneously.)
hinted_handoff_throttle_in_kb: 1024
# Number of threads with which to deliver hints;
# Consider increasing this number when you have multi-dc deployments, since
# cross-dc handoff tends to be slower
max_hints_delivery_threads: 2

# Maximum throttle in KBs per second, total. This will be
# reduced proportionally to the number of nodes in the cluster.
batchlog_replay_throttle_in_kb: 1024

# Authentication backend, implementing IAuthenticator; used to identify users
# Out of the box, Cassandra provides org.apache.cassandra.auth.{AllowAllAuthenticator,
# PasswordAuthenticator}.
#
# - AllowAllAuthenticator performs no checks - set it to disable authentication.
# - PasswordAuthenticator relies on username/password pairs to authenticate
#   users. It keeps usernames and hashed passwords in system_auth.credentials table.
#   Please increase system_auth keyspace replication factor if you use this authenticator.
authenticator: AllowAllAuthenticator

# Authorization backend, implementing IAuthorizer; used to limit access/provide permissions
# Out of the box, Cassandra provides org.apache.cassandra.auth.{AllowAllAuthorizer,
# CassandraAuthorizer}.
#
# - AllowAllAuthorizer allows any action to any user - set it to disable authorization.
# - CassandraAuthorizer stores permissions in system_auth.permissions table. Please
#   increase system_auth keyspace replication factor if you use this authorizer.
authorizer: AllowAllAuthorizer

# Validity period for permissions cache (fetching permissions can be an
# expensive operation depending on the authorizer, CassandraAuthorizer is
# one example). Defaults to 2000, set to 0 to disable.
# Will be disabled automatically for AllowAllAuthorizer.
permissions_validity_in_ms: 2000

# The partitioner is responsible for distributing groups of rows (by
# partition key) across nodes in the cluster.  You should leave this
# alone for new clusters.  The partitioner can NOT be changed without
# reloading all data, so when upgrading you should set this to the
# same partitioner you were already using.
#
# Besides Murmur3Partitioner, partitioners included for backwards
# compatibility include RandomPartitioner, ByteOrderedPartitioner, and
# OrderPreservingPartitioner.
#
partitioner: org.apache.cassandra.dht.Murmur3Partitioner

# Directories where Cassandra should store data on disk.  Cassandra
# will spread data evenly across them, subject to the granularity of
# the configured compaction strategy.
data_file_directories:
    - /var/lib/cassandra/data

# commit log
commitlog_directory: /var/lib/cassandra/commitlog

# policy for data disk failures:
# stop_paranoid: shut down gossip and Thrift even for single-sstable errors.
# stop: shut down gossip and Thrift, leaving the node effectively dead, but
#       can still be inspected via JMX.
# best_effort: stop using the failed disk and respond to requests based on
#              remaining available sstables.  This means you WILL see obsolete
#              data at CL.ONE!
# ignore: ignore fatal errors and let requests fail, as in pre-1.2 Cassandra
disk_failure_policy: stop

# policy for commit disk failures:
# stop: shut down gossip and Thrift, leaving the node effectively dead, but
#       can still be inspected via JMX.
# stop_commit: shutdown the commit log, letting writes collect but 
#              continuing to service reads, as in pre-2.0.5 Cassandra
# ignore: ignore fatal errors and let the batches fail
commit_failure_policy: stop

# Maximum size of the key cache in memory.
#
# Each key cache hit saves 1 seek and each row cache hit saves 2 seeks at the
# minimum, sometimes more. The key cache is fairly tiny for the amount of
# time it saves, so it's worthwhile to use it at large numbers.
# The row cache saves even more time, but must contain the entire row,
# so it is extremely space-intensive. It's best to only use the
# row cache if you have hot rows or static rows.
#
# NOTE: if you reduce the size, you may not get you hottest keys loaded on startup.
#
# Default value is empty to make it "auto" (min(5% of Heap (in MB), 100MB)). Set to 0 to disable key cache.
key_cache_size_in_mb:

# Duration in seconds after which Cassandra should
# save the key cache. Caches are saved to saved_caches_directory as
# specified in this configuration file.
#
# Saved caches greatly improve cold-start speeds, and is relatively cheap in
# terms of I/O for the key cache. Row cache saving is much more expensive and
# has limited use.
#
# Default is 14400 or 4 hours.
key_cache_save_period: 14400

# Number of keys from the key cache to save
# Disabled by default, meaning all keys are going to be saved
# key_cache_keys_to_save: 100

# Maximum size of the row cache in memory.
# NOTE: if you reduce the size, you may not get you hottest keys loaded on startup.
#
# Default value is 0, to disable row caching.
row_cache_size_in_mb: 0

# Duration in seconds after which Cassandra should
# safe the row cache. Caches are saved to saved_caches_directory as specified
# in this configuration file.
#
# Saved caches greatly improve cold-start speeds, and is relatively cheap in
# terms of I/O for the key cache. Row cache saving is much more expensive and
# has limited use.
#
# Default is 0 to disable saving the row cache.
row_cache_save_period: 0

# Number of keys from the row cache to save
# Disabled by default, meaning all keys are going to be saved
# row_cache_keys_to_save: 100

# The off-heap memory allocator.  Affects storage engine metadata as
# well as caches.  Experiments show that JEMAlloc saves some memory
# than the native GCC allocator (i.e., JEMalloc is more
# fragmentation-resistant).
# 
# Supported values are: NativeAllocator, JEMallocAllocator
#
# If you intend to use JEMallocAllocator you have to install JEMalloc as library and
# modify cassandra-env.sh as directed in the file.
#
# Defaults to NativeAllocator
# memory_allocator: NativeAllocator

# saved caches
saved_caches_directory: /var/lib/cassandra/saved_caches

# commitlog_sync may be either "periodic" or "batch." 
# When in batch mode, Cassandra won't ack writes until the commit log
# has been fsynced to disk.  It will wait up to
# commitlog_sync_batch_window_in_ms milliseconds for other writes, before
# performing the sync.
#
# commitlog_sync: batch
# commitlog_sync_batch_window_in_ms: 50
#
# the other option is "periodic" where writes may be acked immediately
# and the CommitLog is simply synced every commitlog_sync_period_in_ms
# milliseconds.  By default this allows 1024*(CPU cores) pending
# entries on the commitlog queue.  If you are writing very large blobs,
# you should reduce that; 16*cores works reasonably well for 1MB blobs.
# It should be at least as large as the concurrent_writes setting.
commitlog_sync: periodic
commitlog_sync_period_in_ms: 10000
# commitlog_periodic_queue_size:

# The size of the individual commitlog file segments.  A commitlog
# segment may be archived, deleted, or recycled once all the data
# in it (potentially from each columnfamily in the system) has been
# flushed to sstables.  
#
# The default size is 32, which is almost always fine, but if you are
# archiving commitlog segments (see commitlog_archiving.properties),
# then you probably want a finer granularity of archiving; 8 or 16 MB
# is reasonable.
commitlog_segment_size_in_mb: 32

# any class that implements the SeedProvider interface and has a
# constructor that takes a Map<String, String> of parameters will do.
seed_provider: "123.456.7.8"
    # Addresses of hosts that are deemed contact points. 
    # Cassandra nodes use this list of hosts to find each other and learn
    # the topology of the ring.  You must change this if you are running
    # multiple nodes!
    - class_name: org.apache.cassandra.locator.SimpleSeedProvider
      parameters:
          # seeds is actually a comma-delimited list of addresses.
          # Ex: "<ip1>,<ip2>,<ip3>"
           - seeds: "172.0.0.1"

# For workloads with more data than can fit in memory, Cassandra's
# bottleneck will be reads that need to fetch data from
# disk. "concurrent_reads" should be set to (16 * number_of_drives) in
# order to allow the operations to enqueue low enough in the stack
# that the OS and drives can reorder them.
#
# On the other hand, since writes are almost never IO bound, the ideal
# number of "concurrent_writes" is dependent on the number of cores in
# your system; (8 * number_of_cores) is a good rule of thumb.
concurrent_reads: 32
concurrent_writes: 32

# Total memory to use for sstable-reading buffers.  Defaults to
# the smaller of 1/4 of heap or 512MB.
# file_cache_size_in_mb: 512

# Total memory to use for memtables.  Cassandra will flush the largest
# memtable when this much memory is used.
# If omitted, Cassandra will set it to 1/4 of the heap.
# memtable_total_space_in_mb: 2048

# Total space to use for commitlogs.  Since commitlog segments are
# mmapped, and hence use up address space, the default size is 32
# on 32-bit JVMs, and 1024 on 64-bit JVMs.
#
# If space gets above this value (it will round up to the next nearest
# segment multiple), Cassandra will flush every dirty CF in the oldest
# segment and remove it.  So a small total commitlog space will tend
# to cause more flush activity on less-active columnfamilies.
# commitlog_total_space_in_mb: 4096

# This sets the amount of memtable flush writer threads.  These will
# be blocked by disk io, and each one will hold a memtable in memory
# while blocked. If you have a large heap and many data directories,
# you can increase this value for better flush performance.
# By default this will be set to the amount of data directories defined.
#memtable_flush_writers: 1

# the number of full memtables to allow pending flush, that is,
# waiting for a writer thread.  At a minimum, this should be set to
# the maximum number of secondary indexes created on a single CF.
memtable_flush_queue_size: 4

# Whether to, when doing sequential writing, fsync() at intervals in
# order to force the operating system to flush the dirty
# buffers. Enable this to avoid sudden dirty buffer flushing from
# impacting read latencies. Almost always a good idea on SSDs; not
# necessarily on platters.
trickle_fsync: false
trickle_fsync_interval_in_kb: 10240

# TCP port, for commands and data
storage_port: 7000

# SSL port, for encrypted communication.  Unused unless enabled in
# encryption_options
ssl_storage_port: 7001

# Address to bind to and tell other Cassandra nodes to connect to. You
# _must_ change this if you want multiple nodes to be able to
# communicate!
# 
# Leaving it blank leaves it up to InetAddress.getLocalHost(). This
# will always do the Right Thing _if_ the node is properly configured
# (hostname, name resolution, etc), and the Right Thing is to use the
# address associated with the hostname (it might not be).
#
# Setting this to 0.0.0.0 is always wrong.
listen_address: localhost

# Address to broadcast to other Cassandra nodes
# Leaving this blank will set it to the same value as listen_address
# broadcast_address: 1.2.3.4

# Internode authentication backend, implementing IInternodeAuthenticator;
# used to allow/disallow connections from peer nodes.
# internode_authenticator: org.apache.cassandra.auth.AllowAllInternodeAuthenticator

# Whether to start the native transport server.
# Please note that the address on which the native transport is bound is the
# same as the rpc_address. The port however is different and specified below.
start_native_transport: true
# port for the CQL native transport to listen for clients on
native_transport_port: 9042
# The maximum threads for handling requests when the native transport is used.
# This is similar to rpc_max_threads though the default differs slightly (and
# there is no native_transport_min_threads, idle threads will always be stopped
# after 30 seconds).
# native_transport_max_threads: 128
#
# The maximum size of allowed frame. Frame (requests) larger than this will
# be rejected as invalid. The default is 256MB.
# native_transport_max_frame_size_in_mb: 256

# Whether to start the thrift rpc server.
start_rpc: true

# The address to bind the Thrift RPC service and native transport
# server -- clients connect here.
#
# Leaving this blank has the same effect it does for ListenAddress,
# (i.e. it will be based on the configured hostname of the node).
#
# Note that unlike ListenAddress above, it is allowed to specify 0.0.0.0
# here if you want to listen on all interfaces, but that will break clients 
# that rely on node auto-discovery.
rpc_address: localhost
# port for Thrift to listen for clients on
rpc_port: 9160

# enable or disable keepalive on rpc/native connections
rpc_keepalive: true

# Cassandra provides two out-of-the-box options for the RPC Server:
#
# sync  -> One thread per thrift connection. For a very large number of clients, memory
#          will be your limiting factor. On a 64 bit JVM, 180KB is the minimum stack size
#          per thread, and that will correspond to your use of virtual memory (but physical memory
#          may be limited depending on use of stack space).
#
# hsha  -> Stands for "half synchronous, half asynchronous." All thrift clients are handled
#          asynchronously using a small number of threads that does not vary with the amount
#          of thrift clients (and thus scales well to many clients). The rpc requests are still
#          synchronous (one thread per active request).
#
# The default is sync because on Windows hsha is about 30% slower.  On Linux,
# sync/hsha performance is about the same, with hsha of course using less memory.
#
# Alternatively,  can provide your own RPC server by providing the fully-qualified class name
# of an o.a.c.t.TServerFactory that can create an instance of it.
rpc_server_type: sync

# Uncomment rpc_min|max_thread to set request pool size limits.
#
# Regardless of your choice of RPC server (see above), the number of maximum requests in the
# RPC thread pool dictates how many concurrent requests are possible (but if you are using the sync
# RPC server, it also dictates the number of clients that can be connected at all).
#
# The default is unlimited and thus provides no protection against clients overwhelming the server. You are
# encouraged to set a maximum that makes sense for you in production, but do keep in mind that
# rpc_max_threads represents the maximum number of client requests this server may execute concurrently.
#
# rpc_min_threads: 16
# rpc_max_threads: 2048

# uncomment to set socket buffer sizes on rpc connections
# rpc_send_buff_size_in_bytes:
# rpc_recv_buff_size_in_bytes:

# Uncomment to set socket buffer size for internode communication
# Note that when setting this, the buffer size is limited by net.core.wmem_max
# and when not setting it it is defined by net.ipv4.tcp_wmem
# See:
# /proc/sys/net/core/wmem_max
# /proc/sys/net/core/rmem_max
# /proc/sys/net/ipv4/tcp_wmem
# /proc/sys/net/ipv4/tcp_wmem
# and: man tcp
# internode_send_buff_size_in_bytes:
# internode_recv_buff_size_in_bytes:

# Frame size for thrift (maximum message length).
thrift_framed_transport_size_in_mb: 15

# Set to true to have Cassandra create a hard link to each sstable
# flushed or streamed locally in a backups/ subdirectory of the
# keyspace data.  Removing these links is the operator's
# responsibility.
incremental_backups: false

# Whether or not to take a snapshot before each compaction.  Be
# careful using this option, since Cassandra won't clean up the
# snapshots for you.  Mostly useful if you're paranoid when there
# is a data format change.
snapshot_before_compaction: false

# Whether or not a snapshot is taken of the data before keyspace truncation
# or dropping of column families. The STRONGLY advised default of true 
# should be used to provide data safety. If you set this flag to false, you will
# lose data on truncation or drop.
auto_snapshot: true

# When executing a scan, within or across a partition, we need to keep the
# tombstones seen in memory so we can return them to the coordinator, which
# will use them to make sure other replicas also know about the deleted rows.
# With workloads that generate a lot of tombstones, this can cause performance
# problems and even exaust the server heap.
# (http://www.datastax.com/dev/blog/cassandra-anti-patterns-queues-and-queue-like-datasets)
# Adjust the thresholds here if you understand the dangers and want to
# scan more tombstones anyway.  These thresholds may also be adjusted at runtime
# using the StorageService mbean.
tombstone_warn_threshold: 1000
tombstone_failure_threshold: 100000

# Add column indexes to a row after its contents reach this size.
# Increase if your column values are large, or if you have a very large
# number of columns.  The competing causes are, Cassandra has to
# deserialize this much of the row to read a single column, so you want
# it to be small - at least if you do many partial-row reads - but all
# the index data is read for each access, so you don't want to generate
# that wastefully either.
column_index_size_in_kb: 64


# Log WARN on any batch size exceeding this value. 5kb per batch by default.
# Caution should be taken on increasing the size of this threshold as it can lead to node instability.
batch_size_warn_threshold_in_kb: 5

# Size limit for rows being compacted in memory.  Larger rows will spill
# over to disk and use a slower two-pass compaction process.  A message
# will be logged specifying the row key.
in_memory_compaction_limit_in_mb: 64

# Number of simultaneous compactions to allow, NOT including
# validation "compactions" for anti-entropy repair.  Simultaneous
# compactions can help preserve read performance in a mixed read/write
# workload, by mitigating the tendency of small sstables to accumulate
# during a single long running compactions. The default is usually
# fine and if you experience problems with compaction running too
# slowly or too fast, you should look at
# compaction_throughput_mb_per_sec first.
#
# concurrent_compactors defaults to the number of cores.
# Uncomment to make compaction mono-threaded, the pre-0.8 default.
#concurrent_compactors: 1

# Multi-threaded compaction. When enabled, each compaction will use
# up to one thread per core, plus one thread per sstable being merged.
# This is usually only useful for SSD-based hardware: otherwise, 
# your concern is usually to get compaction to do LESS i/o (see:
# compaction_throughput_mb_per_sec), not more.
multithreaded_compaction: false

# Throttles compaction to the given total throughput across the entire
# system. The faster you insert data, the faster you need to compact in
# order to keep the sstable count down, but in general, setting this to
# 16 to 32 times the rate you are inserting data is more than sufficient.
# Setting this to 0 disables throttling. Note that this account for all types
# of compaction, including validation compaction.
compaction_throughput_mb_per_sec: 16

#卡桑德拉存储配置YAML
#注:
#看http://wiki.apache.org/cassandra/StorageConfiguration 对于
#配置指令的完整解释
#/注
#群集的名称。这主要用于防止机器损坏
#一个逻辑群集无法加入另一个逻辑群集。
群集名称：“测试群集”
#这定义了环上随机分配给该节点的令牌数
#相对于其他节点，令牌越多，数据的比例就越大
#此节点将存储的。您可能希望所有节点都具有相同的编号
#假设令牌具有相同的硬件能力，则令牌的数量。
#
#如果未指定此标记，Cassandra将使用默认的1标记来实现遗留兼容性，
#并将使用如下所述的初始_令牌。
#
#指定初始\u令牌将覆盖此设置。
#
#如果您已经有一个每个节点1个令牌的集群，并且希望迁移到
#每个节点有多个令牌，请参阅http://wiki.apache.org/cassandra/Operations
令牌数：256
#初始令牌允许您手动指定令牌。而你可以将它与
#vnodes（num_tokens>1，如上）——在这种情况下，您应该提供
#逗号分隔列表——主要用于将节点#添加到遗留集群
#未启用VNode的。
#初始令牌：
#可以是“true”或“false”以全局启用，也可以包含列表
#每个数据中心要启用的数据中心数量。
#提示切换已启用：DC1、DC2
#看http://wiki.apache.org/cassandra/HintedHandoff
提示切换已启用：true
#这定义了死机主机将有提示的最长时间
#生成。在它死了这么长时间之后，关于它的新提示就不会出现了
#直到它被活生生地看到并再次倒下。
最大提示窗口时间：10800000 3小时
#每个传递线程的最大油门（以每秒KBs为单位）。这将是
#与群集中的节点数成比例减少。（如有）
#集群中有两个节点，每个传递线程将使用最大
#速率；如果有三个，每个将节流到最大值的一半，
#因为我们期望两个节点同时传递提示。）
暗示的\u切换\u限制\u（单位：1024 kb）
#用于传递提示的线程数；
当你有多个DC部署时，考虑增加这个数目，因为
#交叉dc切换往往较慢
最大提示线程数：2
#最大油门（以每秒KBs为单位），总计。这将是
#与群集中的节点数成比例减少。
batchlog\u replay\u throttle\u（单位：kb）：1024
#认证后端，实现IAAuthenticator；用于识别用户
#Cassandra提供了org.apache.Cassandra.auth.{AllowAllAuthenticator，
#密码验证器}。
#
#-AllowAllAuthenticator不执行任何检查-将其设置为禁用身份验证。
#-PasswordAuthenticator依赖用户名/密码对进行身份验证
#用户。它将用户名和哈希密码保存在system_auth.credentials表中。
#如果使用此验证器，请增加system_auth密钥空间复制因子。
验证者：AllowAllAuthenticator
#授权后端，实现IAAuthorizer；用于限制访问/提供权限
#Cassandra提供了org.apache.Cassandra.auth.{AllowAllAuthorizer，
#卡桑德拉}。
#
#-AllowAllAuthorizer允许任何用户执行任何操作-将其设置为禁用授权。
#-CassandraAuthorizer将权限存储在system_auth.permissions表中。请
#如果使用此授权器，请增加system_auth密钥空间复制系数。
授权人：授权人
#权限缓存的有效期（获取权限可以是
#昂贵的操作取决于授权人，CassandraAuthorizer是
#一个例子）。默认值为2000，设置为0禁用。
#将自动禁用AllowAllAuthorizer。
权限\u有效性\u在\u ms中：2000
#分区器负责分配行组（按
#分区密钥）跨群集中的节点。你应该留下这个
#单独用于新集群。未经许可，无法更改分区程序
#重新加载所有数据，因此升级时应将其设置为
#与您已经使用的分区程序相同。
#
#除了3个分区外，还包括向后的分区
#兼容性包括RandomPartitioner、ByteOrderedPartitioner和
#OrderPreservingPartitioner。
#
分区者：org.apache.cassandra.dht.3分区者
#卡桑德拉应该在磁盘上存储数据的目录。卡桑德拉
#将数据均匀地分布在它们之间，这取决于
#配置的压缩策略。
数据文件目录：
-/var/lib/cassandra/data
#提交日志
commitlog_目录：/var/lib/cassandra/commitlog
#数据磁盘故障的策略：
#停止妄想症：停止流言蜚语和节俭行为，即使是单一的错误。
#停止：关闭流言蜚语和节俭，使节点实际上死亡，但是
#仍然可以通过JMX进行检查。
#最大努力：停止使用故障磁盘，并根据请求响应请求
#剩余的可用SSP表。这意味着您将看到过时的
#一级数据！
#忽略：忽略致命错误并让请求失败，如1.2版之前的Cassandra
磁盘\u故障\u策略：停止
#提交磁盘故障的策略：
#停止：关闭流言蜚语和节俭，使节点实际上死亡，但是
#仍然可以通过JMX进行检查。
#stop_commit：关闭提交日志，让写入进行收集，但
#继续服务读取，如2.0.5之前的Cassandra
#忽略：忽略致命错误并让批处理失败
提交失败策略：停止
#内存中密钥缓存的最大大小。
#
#每个键缓存命中保存1次搜索，每个行缓存命中同时保存2次搜索
#最小值，som
# any class that implements the SeedProvider interface and has a
# constructor that takes a Map<String, String> of parameters will do.
seed_provider: "123.456.7.8"
    # Addresses of hosts that are deemed contact points. 
    # Cassandra nodes use this list of hosts to find each other and learn
    # the topology of the ring.  You must change this if you are running
    # multiple nodes!
    - class_name: org.apache.cassandra.locator.SimpleSeedProvider
      parameters:
          # seeds is actually a comma-delimited list of addresses.
          # Ex: "<ip1>,<ip2>,<ip3>"
           - seeds: "172.0.0.1"

# any class that implements the SeedProvider interface and has a
# constructor that takes a Map<String, String> of parameters will do.
seed_provider: 
    # Addresses of hosts that are deemed contact points. 
    # Cassandra nodes use this list of hosts to find each other and learn
    # the topology of the ring.  You must change this if you are running
    # multiple nodes!
    - class_name: org.apache.cassandra.locator.SimpleSeedProvider
      parameters:
          # seeds is actually a comma-delimited list of addresses.
          # Ex: "<ip1>,<ip2>,<ip3>"
           - seeds: "123.456.7.8"