我已经从一个单节点转移到了三个节点的cassandra集群。根据文档，读取等待时间应该减少，并且我应该能够更高效地获取数据。但是它花费的时间比以前要长。
RF = 2
MEMTABLE SIZE = 2GB
HEAP SIZE = 8GB
我已经共享了我运行查询的日志
从locationinfohash中选择*，其中pkhash ='34AAB6D5F1431151212AF721F951057F';
我可以看到它从两个节点读取并在内存表和稳定表中查找数据。
更新1：此local_one一致性（读取）和写入跟踪均已完成 共享两个跟踪会话。
我无法找出为什么要花费这么多时间来获取数据以及为什么要从2个节点中获取数据。
Tracing session: 2e9c6060-560b-11e9-83a5-4bbd3b5675f1
activity | timestamp | source | source_elapsed | client
--------------------------------------------------------------------------------------------------------------------------+----------------------------+-------------+----------------+-------------
Execute CQL3 query | 2019-04-03 12:22:43.814000 | 10.10.10.10 | 0 | 10.10.10.10
READ message received from /10.10.10.10 [MessagingService-Incoming-/10.10.10.10] | 2019-04-03 12:22:40.601000 | 10.10.10.11 | 13 | 10.10.10.10
Executing single-partition query on locationinfohash [ReadStage-3] | 2019-04-03 12:22:40.602000 | 10.10.10.11 | 571 | 10.10.10.10
Acquiring sstable references [ReadStage-3] | 2019-04-03 12:22:40.602000 | 10.10.10.11 | 657 | 10.10.10.10
Bloom filter allows skipping sstable 5366 [ReadStage-3] | 2019-04-03 12:22:40.602000 | 10.10.10.11 | 757 | 10.10.10.10
Bloom filter allows skipping sstable 5365 [ReadStage-3] | 2019-04-03 12:22:40.602000 | 10.10.10.11 | 803 | 10.10.10.10
Bloom filter allows skipping sstable 5348 [ReadStage-3] | 2019-04-03 12:22:40.602000 | 10.10.10.11 | 836 | 10.10.10.10
Bloom filter allows skipping sstable 5310 [ReadStage-3] | 2019-04-03 12:22:40.602000 | 10.10.10.11 | 875 | 10.10.10.10
Bloom filter allows skipping sstable 5166 [ReadStage-3] | 2019-04-03 12:22:40.602001 | 10.10.10.11 | 928 | 10.10.10.10
Bloom filter allows skipping sstable 5029 [ReadStage-3] | 2019-04-03 12:22:40.602001 | 10.10.10.11 | 969 | 10.10.10.10
Bloom filter allows skipping sstable 4472 [ReadStage-3] | 2019-04-03 12:22:40.602001 | 10.10.10.11 | 1004 | 10.10.10.10
Partition index with 5 entries found for sstable 3961 [ReadStage-3] | 2019-04-03 12:22:40.602001 | 10.10.10.11 | 1335 | 10.10.10.10
Bloom filter allows skipping sstable 2660 [ReadStage-3] | 2019-04-03 12:22:40.603000 | 10.10.10.11 | 1876 | 10.10.10.10
Bloom filter allows skipping sstable 2939 [ReadStage-3] | 2019-04-03 12:22:40.603000 | 10.10.10.11 | 1945 | 10.10.10.10
Bloom filter allows skipping sstable 2899 [ReadStage-3] | 2019-04-03 12:22:40.603000 | 10.10.10.11 | 1996 | 10.10.10.10
Bloom filter allows skipping sstable 2651 [ReadStage-3] | 2019-04-03 12:22:40.603000 | 10.10.10.11 | 2041 | 10.10.10.10
Bloom filter allows skipping sstable 1259 [ReadStage-3] | 2019-04-03 12:22:40.603000 | 10.10.10.11 | 2092 | 10.10.10.10
Skipped 0/13 non-slice-intersecting sstables, included 0 due to tombstones [ReadStage-3] | 2019-04-03 12:22:40.603000 | 10.10.10.11 | 2141 | 10.10.10.10
Merged data from memtables and 1 sstables [ReadStage-3] | 2019-04-03 12:22:40.661000 | 10.10.10.11 | 59966 | 10.10.10.10
Read 1233 live rows and 0 tombstone cells [ReadStage-3] | 2019-04-03 12:22:40.662000 | 10.10.10.11 | 60613 | 10.10.10.10
Enqueuing response to /10.10.10.10 [ReadStage-3] | 2019-04-03 12:22:40.662000 | 10.10.10.11 | 60681 | 10.10.10.10
Sending REQUEST_RESPONSE message to /10.10.10.10 [MessagingService-Outgoing-/10.10.10.10-Large] | 2019-04-03 12:22:40.662000 | 10.10.10.11 | 61228 | 10.10.10.10
READ message received from /10.10.10.10 [MessagingService-Incoming-/10.10.10.10] | 2019-04-03 12:22:42.632000 | 10.10.10.12 | 17 | 10.10.10.10
Executing single-partition query on locationinfohash [ReadStage-7] | 2019-04-03 12:22:42.633000 | 10.10.10.12 | 933 | 10.10.10.10
Acquiring sstable references [ReadStage-7] | 2019-04-03 12:22:42.633000 | 10.10.10.12 | 999 | 10.10.10.10
Bloom filter allows skipping sstable 8427 [ReadStage-7] | 2019-04-03 12:22:42.633000 | 10.10.10.12 | 1619 | 10.10.10.10
Bloom filter allows skipping sstable 8426 [ReadStage-7] | 2019-04-03 12:22:42.634000 | 10.10.10.12 | 2125 | 10.10.10.10
Bloom filter allows skipping sstable 8425 [ReadStage-7] | 2019-04-03 12:22:42.634000 | 10.10.10.12 | 2168 | 10.10.10.10
Bloom filter allows skipping sstable 8424 [ReadStage-7] | 2019-04-03 12:22:42.634000 | 10.10.10.12 | 2197 | 10.10.10.10
Bloom filter allows skipping sstable 8423 [ReadStage-7] | 2019-04-03 12:22:42.634000 | 10.10.10.12 | 2224 | 10.10.10.10
Bloom filter allows skipping sstable 8422 [ReadStage-7] | 2019-04-03 12:22:42.634000 | 10.10.10.12 | 2251 | 10.10.10.10
Bloom filter allows skipping sstable 8421 [ReadStage-7] | 2019-04-03 12:22:42.634000 | 10.10.10.12 | 2290 | 10.10.10.10
Bloom filter allows skipping sstable 8420 [ReadStage-7] | 2019-04-03 12:22:42.634001 | 10.10.10.12 | 2318 | 10.10.10.10
Bloom filter allows skipping sstable 8419 [ReadStage-7] | 2019-04-03 12:22:42.634001 | 10.10.10.12 | 2347 | 10.10.10.10
Bloom filter allows skipping sstable 8418 [ReadStage-7] | 2019-04-03 12:22:42.634001 | 10.10.10.12 | 2381 | 10.10.10.10
Bloom filter allows skipping sstable 8417 [ReadStage-7] | 2019-04-03 12:22:42.634001 | 10.10.10.12 | 2409 | 10.10.10.10
Bloom filter allows skipping sstable 8416 [ReadStage-7] | 2019-04-03 12:22:42.634001 | 10.10.10.12 | 2437 | 10.10.10.10
Bloom filter allows skipping sstable 8415 [ReadStage-7] | 2019-04-03 12:22:42.634001 | 10.10.10.12 | 2463 | 10.10.10.10
Bloom filter allows skipping sstable 8414 [ReadStage-7] | 2019-04-03 12:22:42.634001 | 10.10.10.12 | 2491 | 10.10.10.10
Bloom filter allows skipping sstable 8413 [ReadStage-7] | 2019-04-03 12:22:42.634001 | 10.10.10.12 | 2519 | 10.10.10.10
Bloom filter allows skipping sstable 8412 [ReadStage-7] | 2019-04-03 12:22:42.634001 | 10.10.10.12 | 2546 | 10.10.10.10
Bloom filter allows skipping sstable 8411 [ReadStage-7] | 2019-04-03 12:22:42.634001 | 10.10.10.12 | 2573 | 10.10.10.10
Bloom filter allows skipping sstable 8410 [ReadStage-7] | 2019-04-03 12:22:42.634001 | 10.10.10.12 | 2605 | 10.10.10.10
Bloom filter allows skipping sstable 8409 [ReadStage-7] | 2019-04-03 12:22:42.634001 | 10.10.10.12 | 2633 | 10.10.10.10
Bloom filter allows skipping sstable 8408 [ReadStage-7] | 2019-04-03 12:22:42.634002 | 10.10.10.12 | 2661 | 10.10.10.10
Bloom filter allows skipping sstable 8407 [ReadStage-7] | 2019-04-03 12:22:42.634002 | 10.10.10.12 | 2688 | 10.10.10.10
Bloom filter allows skipping sstable 8406 [ReadStage-7] | 2019-04-03 12:22:42.635000 | 10.10.10.12 | 2727 | 10.10.10.10
Bloom filter allows skipping sstable 8405 [ReadStage-7] | 2019-04-03 12:22:42.635000 | 10.10.10.12 | 2771 | 10.10.10.10
Bloom filter allows skipping sstable 8404 [ReadStage-7] | 2019-04-03 12:22:42.635000 | 10.10.10.12 | 2929 | 10.10.10.10
Bloom filter allows skipping sstable 8403 [ReadStage-7] | 2019-04-03 12:22:42.635000 | 10.10.10.12 | 3043 | 10.10.10.10
Bloom filter allows skipping sstable 8402 [ReadStage-7] | 2019-04-03 12:22:42.635000 | 10.10.10.12 | 3466 | 10.10.10.10
Bloom filter allows skipping sstable 8401 [ReadStage-7] | 2019-04-03 12:22:42.635000 | 10.10.10.12 | 3521 | 10.10.10.10
Bloom filter allows skipping sstable 8400 [ReadStage-7] | 2019-04-03 12:22:42.635001 | 10.10.10.12 | 3567 | 10.10.10.10
Bloom filter allows skipping sstable 8399 [ReadStage-7] | 2019-04-03 12:22:42.635001 | 10.10.10.12 | 3615 | 10.10.10.10
Bloom filter allows skipping sstable 8398 [ReadStage-7] | 2019-04-03 12:22:42.635001 | 10.10.10.12 | 3676 | 10.10.10.10
Bloom filter allows skipping sstable 8397 [ReadStage-7] | 2019-04-03 12:22:42.636000 | 10.10.10.12 | 3722 | 10.10.10.10
Bloom filter allows skipping sstable 8396 [ReadStage-7] | 2019-04-03 12:22:42.636000 | 10.10.10.12 | 3764 | 10.10.10.10
Bloom filter allows skipping sstable 8395 [ReadStage-7] | 2019-04-03 12:22:42.636000 | 10.10.10.12 | 3810 | 10.10.10.10
Bloom filter allows skipping sstable 8394 [ReadStage-7] | 2019-04-03 12:22:42.636000 | 10.10.10.12 | 3852 | 10.10.10.10
Bloom filter allows skipping sstable 8393 [ReadStage-7] | 2019-04-03 12:22:42.636000 | 10.10.10.12 | 3896 | 10.10.10.10
Bloom filter allows skipping sstable 8392 [ReadStage-7] | 2019-04-03 12:22:42.636000 | 10.10.10.12 | 3941 | 10.10.10.10
Bloom filter allows skipping sstable 8391 [ReadStage-7] | 2019-04-03 12:22:42.636001 | 10.10.10.12 | 3979 | 10.10.10.10
Bloom filter allows skipping sstable 8390 [ReadStage-7] | 2019-04-03 12:22:42.636001 | 10.10.10.12 | 4006 | 10.10.10.10
Bloom filter allows skipping sstable 8389 [ReadStage-7] | 2019-04-03 12:22:42.636001 | 10.10.10.12 | 4033 | 10.10.10.10
Bloom filter allows skipping sstable 8388 [ReadStage-7] | 2019-04-03 12:22:42.636001 | 10.10.10.12 | 4061 | 10.10.10.10
Bloom filter allows skipping sstable 8387 [ReadStage-7] | 2019-04-03 12:22:42.636001 | 10.10.10.12 | 4105 | 10.10.10.10
Bloom filter allows skipping sstable 8386 [ReadStage-7] | 2019-04-03 12:22:42.636001 | 10.10.10.12 | 4136 | 10.10.10.10
Bloom filter allows skipping sstable 8385 [ReadStage-7] | 2019-04-03 12:22:42.636001 | 10.10.10.12 | 4164 | 10.10.10.10
Bloom filter allows skipping sstable 8384 [ReadStage-7] | 2019-04-03 12:22:42.636001 | 10.10.10.12 | 4190 | 10.10.10.10
Bloom filter allows skipping sstable 8383 [ReadStage-7] | 2019-04-03 12:22:42.636001 | 10.10.10.12 | 4217 | 10.10.10.10
Bloom filter allows skipping sstable 8382 [ReadStage-7] | 2019-04-03 12:22:42.636002 | 10.10.10.12 | 4255 | 10.10.10.10
Bloom filter allows skipping sstable 8381 [ReadStage-7] | 2019-04-03 12:22:42.636002 | 10.10.10.12 | 4282 | 10.10.10.10
Bloom filter allows skipping sstable 8380 [ReadStage-7] | 2019-04-03 12:22:42.636002 | 10.10.10.12 | 4311 | 10.10.10.10
Bloom filter allows skipping sstable 8379 [ReadStage-7] | 2019-04-03 12:22:42.636002 | 10.10.10.12 | 4338 | 10.10.10.10
Bloom filter allows skipping sstable 8378 [ReadStage-7] | 2019-04-03 12:22:42.636002 | 10.10.10.12 | 4380 | 10.10.10.10
Bloom filter allows skipping sstable 8348 [ReadStage-7] | 2019-04-03 12:22:42.636002 | 10.10.10.12 | 4424 | 10.10.10.10
Bloom filter allows skipping sstable 7781 [ReadStage-7] | 2019-04-03 12:22:42.636002 | 10.10.10.12 | 4475 | 10.10.10.10
Bloom filter allows skipping sstable 7253 [ReadStage-7] | 2019-04-03 12:22:42.636002 | 10.10.10.12 | 4520 | 10.10.10.10
Bloom filter allows skipping sstable 6704 [ReadStage-7] | 2019-04-03 12:22:42.637000 | 10.10.10.12 | 5603 | 10.10.10.10
Partition index with 5 entries found for sstable 6223 [ReadStage-7] | 2019-04-03 12:22:42.638000 | 10.10.10.12 | 5757 | 10.10.10.10
Bloom filter allows skipping sstable 4263 [ReadStage-7] | 2019-04-03 12:22:42.641000 | 10.10.10.12 | 9393 | 10.10.10.10
Bloom filter allows skipping sstable 4598 [ReadStage-7] | 2019-04-03 12:22:42.641000 | 10.10.10.12 | 9470 | 10.10.10.10
Bloom filter allows skipping sstable 4258 [ReadStage-7] | 2019-04-03 12:22:42.641000 | 10.10.10.12 | 9503 | 10.10.10.10
Bloom filter allows skipping sstable 4265 [ReadStage-7] | 2019-04-03 12:22:42.641001 | 10.10.10.12 | 9532 | 10.10.10.10
Skipped 0/59 non-slice-intersecting sstables, included 0 due to tombstones [ReadStage-7] | 2019-04-03 12:22:42.641001 | 10.10.10.12 | 9562 | 10.10.10.10
Merged data from memtables and 1 sstables [ReadStage-7] | 2019-04-03 12:22:42.708000 | 10.10.10.12 | 76713 | 10.10.10.10
Read 1233 live rows and 0 tombstone cells [ReadStage-7] | 2019-04-03 12:22:42.709000 | 10.10.10.12 | 77406 | 10.10.10.10
Enqueuing response to /10.10.10.10 [ReadStage-7] | 2019-04-03 12:22:42.709000 | 10.10.10.12 | 77503 | 10.10.10.10
Sending REQUEST_RESPONSE message to /10.10.10.10 [MessagingService-Outgoing-/10.10.10.10-Large] | 2019-04-03 12:22:42.710000 | 10.10.10.12 | 78298 | 10.10.10.10
Parsing select * from locationinfohash WHERE pkhash = '118BF26BD7FDF182DEC316296A8B1945'; [Native-Transport-Requests-20] | 2019-04-03 12:22:43.814000 | 10.10.10.10 | 101 | 10.10.10.10
Preparing statement [Native-Transport-Requests-20] | 2019-04-03 12:22:43.814000 | 10.10.10.10 | 157 | 10.10.10.10
reading data from /10.10.10.11 [Native-Transport-Requests-20] | 2019-04-03 12:22:43.814000 | 10.10.10.10 | 433 | 10.10.10.10
speculating read retry on /10.10.10.12 [Native-Transport-Requests-20] | 2019-04-03 12:22:43.815000 | 10.10.10.10 | 521 | 10.10.10.10
Sending READ message to /10.10.10.11 [MessagingService-Outgoing-/10.10.10.11-Small] | 2019-04-03 12:22:43.815000 | 10.10.10.10 | 573 | 10.10.10.10
Sending READ message to /10.10.10.12 [MessagingService-Outgoing-/10.10.10.12-Small] | 2019-04-03 12:22:43.815000 | 10.10.10.10 | 594 | 10.10.10.10
REQUEST_RESPONSE message received from /10.10.10.11 [MessagingService-Incoming-/10.10.10.11] | 2019-04-03 12:22:43.880000 | 10.10.10.10 | 65915 | 10.10.10.10
Processing response from /10.10.10.11 [RequestResponseStage-9] | 2019-04-03 12:22:43.880000 | 10.10.10.10 | 66069 | 10.10.10.10
REQUEST_RESPONSE message received from /10.10.10.12 [MessagingService-Incoming-/10.10.10.12] | 2019-04-03 12:22:43.905000 | 10.10.10.10 | 145 | 10.10.10.10
Processing response from /10.10.10.12 [RequestResponseStage-2] | 2019-04-03 12:22:43.906000 | 10.10.10.10 | 270 | 10.10.10.10
Initiating read-repair [RequestResponseStage-2] | 2019-04-03 12:22:43.906000 | 10.10.10.10 | 329 | 10.10.10.10
Request complete | 2019-04-03 12:22:43.892987 | 10.10.10.10 | 78987 | 10.10.10.10
编辑1：
CREATE TABLE trackfleet_db.locationinfohash (
pkhash text,
gpsdt timestamp,
dt timestamp,
gpsdtt bigint,
id text,
lastgpsdt timestamp,
latitude double,
longitude double,
odo int,
odometer int,
port int,
speed int,
srtangle int,
stats map<text, int>,
stoppageflag int,
PRIMARY KEY (pkhash, gpsdt)
) WITH CLUSTERING ORDER BY (gpsdt ASC)
AND bloom_filter_fp_chance = 0.01
AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'}
AND comment = ''
AND compaction = {'class': 'org.apache.cassandra.db.compaction.TimeWindowCompactionStrategy', 'compaction_window_size': '1', 'compaction_window_unit': 'DAYS', 'max_threshold': '32', 'min_threshold': '4'}
AND compression = {'chunk_length_in_kb': '64', 'class': 'org.apache.cassandra.io.compress.LZ4Compressor'}
AND crc_check_chance = 1.0
AND dclocal_read_repair_chance = 0.1
AND default_time_to_live = 0
AND gc_grace_seconds = 864000
AND max_index_interval = 2048
AND memtable_flush_period_in_ms = 0
AND min_index_interval = 128
AND read_repair_chance = 0.0
AND speculative_retry = '99PERCENTILE';