Performance Cassandra群集吞吐量已被限制

我是卡桑德拉的新手，希望能从以前见过这个的人那里得到一些帮助

目前，我在东亚马逊ec2和西亚马逊ec2地区都有应用服务器和Cassandra集群。下面我得到了一个奇怪的性能测试结果，这意味着当应用服务器和C*集群位于同一个区域时，我相信它们使用内部IP，吞吐量会受到限制；当应用服务器和C*集群跨区域时，吞吐量是可伸缩的

西C*和东C*具有完全相同的硬件和模式。2个应用服务器也是相同的

west app sever -> west C* cluster      throttled
west app sever -> east C* cluster      scalable
east app sever -> east C* cluster      throttled
east app sever -> west C* cluster      scalable

卡桑德拉·亚马尔

cluster_name: 'STEAST'
initial_token: -9223372036854775808
hinted_handoff_enabled: true
max_hint_window_in_ms: 10800000 # 3 hours
hinted_handoff_throttle_in_kb: 1024
max_hints_delivery_threads: 2
batchlog_replay_throttle_in_kb: 1024
authenticator: AllowAllAuthenticator
authorizer: AllowAllAuthorizer
permissions_validity_in_ms: 2000
partitioner: org.apache.cassandra.dht.Murmur3Partitioner
data_file_directories:
    - /raid0/cassandra/data

commitlog_directory: /raid0/cassandra/commitlog
disk_failure_policy: stop
commit_failure_policy: stop
key_cache_size_in_mb:
key_cache_save_period: 14400
row_cache_size_in_mb: 0
row_cache_save_period: 0
saved_caches_directory: /raid0/cassandra/saved_caches
commitlog_sync: periodic
commitlog_sync_period_in_ms: 10000
commitlog_segment_size_in_mb: 32

seed_provider:
    - class_name: org.apache.cassandra.locator.SimpleSeedProvider
      parameters:
          - seeds: "10.239.xxx.xxx"

concurrent_reads: 32
concurrent_writes: 32
memtable_flush_queue_size: 4
trickle_fsync: false
trickle_fsync_interval_in_kb: 10240
storage_port: 7000
ssl_storage_port: 7001
listen_address: 10.239.xxx.xxx
start_native_transport: true
native_transport_port: 9042
start_rpc: true
rpc_address: 0.0.0.0
rpc_port: 9160
rpc_keepalive: true
rpc_server_type: sync
thrift_framed_transport_size_in_mb: 15
incremental_backups: false
snapshot_before_compaction: false
auto_snapshot: true
tombstone_warn_threshold: 1000
tombstone_failure_threshold: 100000
column_index_size_in_kb: 64
in_memory_compaction_limit_in_mb: 64
multithreaded_compaction: false
compaction_throughput_mb_per_sec: 16
compaction_preheat_key_cache: true
read_request_timeout_in_ms: 10000
range_request_timeout_in_ms: 10000
write_request_timeout_in_ms: 10000
cas_contention_timeout_in_ms: 1000
truncate_request_timeout_in_ms: 60000
request_timeout_in_ms: 10000
cross_node_timeout: false
phi_convict_threshold: 12
endpoint_snitch: com.datastax.bdp.snitch.DseDelegateSnitch
dynamic_snitch_update_interval_in_ms: 100 
dynamic_snitch_reset_interval_in_ms: 600000
dynamic_snitch_badness_threshold: 0.1
request_scheduler: org.apache.cassandra.scheduler.NoScheduler
server_encryption_options:
    internode_encryption: none
    keystore: resources/dse/conf/.keystore
    keystore_password: cassandra
    truststore: resources/dse/conf/.truststore
    truststore_password: cassandra

client_encryption_options:
    enabled: false
    keystore: resources/dse/conf/.keystore
    keystore_password: cassandra
internode_compression: all
inter_dc_tcp_nodelay: false
preheat_kernel_page_cache: false
auto_bootstrap: false

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最后，我发现编译准备好的语句时有一个锁。每当有新的请求出现时，我都会编译一个新的准备好的语句，在我更改为重用它之后，我得到了我的应用服务器规模。然而，我仍然不知道为什么跨地区的案例可以扩展