Cassandra 2.1, etkilenen sütunlara göre performans ekler mi?

Question

Çevre: Cassandra 2.1, DataStax Sürücü 2.1.9, DSE 4.8

tek düğüm küme ben bir tablo oluşturdu:

create table calc_data_test2(
    data_set_id uuid,svod_type text,section text,index_code text,value_type text,data_hash text,c1 text,c2 text,c3 text,c4 text,c5 text,c6 text,c7 text,c8 text,c9 text,c10 text,c11 text,c12 text,c13 text,c14 text,c15 text,c16 text,c17 text,c18 text,c19 text,c20 text,c21 text,c22 text,c23 text,c24 text,c25 text,c26 text,c27 text,c28 text,c29 text,c30 text,c31 text,c32 text,c33 text,c34 text,c35 text,c36 text,c37 text,c38 text,c39 text,c40 text,c41 text,c42 text,c43 text,c44 text,c45 text,c46 text,c47 text,c48 text,c49 text,c50 text,c51 text,c52 text,c53 text,c54 text,c55 text,c56 text,c57 text,c58 text,c59 text,c60 text,c61 text,c62 text,c63 text,c64 text,c65 text,c66 text,c67 text,c68 text,c69 text,c70 text,c71 text,c72 text,c73 text,c74 text,c75 text,c76 text,c77 text,c78 text,c79 text,c80 text,c81 text,c82 text,c83 text,c84 text,c85 text,c86 text,c87 text,c88 text,c89 text,c90 text,c91 text,c92 text,c93 text,c94 text,c95 text,c96 text,c97 text,c98 text,c99 text,c100 text,se1 text,se2 text,data_value double, 
    primary key ((data_set_id)) 
); 

Sonra tabloya zaman uyumsuz uçlar birkaç deney yaptı. Her bir dava için 50 paralel istekle aynı tabloda 1000000 ekler vardı. Etkilenen sütunların sayısındaki fark. İşte sonuçlar geçerli:

• 85 sütunlar - 143860 msn
• 65 sütunlar - 108564 msn
• 45 sütunlar - 78213 ms
• 25 sütunlar - 68447 ms
• 5 sütun - 49812 ms

Aşağıdaki ayrıntılar. 65 sütun

>java -jar store-utils-cli.jar -pt "insert into csod.calc_data_test2(data_set_id, svod_type,section,index_code,value_type,c1,c2,c3,c4,c5,c6,c7,c8,c9,c10,c11,c12,c13,c14,c15,c16,c17,c18,c19,c20,c21,c22,c23,c24,c25,c26,c27,c28,c29,c30,c31,c32,c33,c34,c35,c36,c37,c38,c39,c40,c41,c42,c43,c44,c45,c46,c47,c48,c49,c50,c51,c52,c53,c54,c55,c56,c57,c58,c59,c60,c61,c62,c63,c64,c65,c66,c67,c68,c69,c70,c71,c72,c73,c74,c75,c76,c77,c78,c79,c80) VALUES(now(), '58','9281','7611','367','7371','8353','4269','134','5884','6794','3147','7639','7798','7890','8547','4212','8630','5962','8686','4482','372','7218','6070','5525','1381','9816','5721','3632','5364','3980','6635','9641','518','6394','2560','1202','5595','7466','1507','7783','9586','6724','9169','9673','7867','8509','6889','3540','5994','4290','1925','8924','4704','4987','803','4291','4987','1111','4934','9885','6441','8212','9349','6852','6628','42','6713','3696','3316','8122','3288','3845','6063','5430','2052','5121','3343','6362','8724','2184','1380','5828','3723','8185');" 1000000 --cassandra.connection.requests.max.local=50 
22:56:40,398 INFO ru.croc.rosstat.csod.store.cassandra.connection.CassandraCluster:-1 - Connection to CassandraSettings$Connection(nodes:[csodx01.lab.croc.ru], port:9042, keyspace:csod, requests:CassandraSettings$Connection$Requests(fetchSize:1000, batchSize:2000, consistencyLevel:LOCAL_QUORUM, max:CassandraSettings$Connection$Requests$Max(local:50, remote:20, retry:CassandraSettings$Connection$Requests$Max$Retry(enabled:true, read:10, write:10, unavailable:5)))) established 

Entering: Overall process 
Entering: Prebuilding of statements 
Leaving [1086 ms]: Prebuilding of statements 
Entering: Executing statements async 
Leaving [143860 ms][6951.202558042542 ops/s]: Executing statements async 
Leaving [144954 ms]: Overall process 

yerleştirin: 45 sütun

>java -jar store-utils-cli.jar -pt "insert into csod.calc_data_test2(data_set_id, svod_type,section,index_code,value_type,c1,c2,c3,c4,c5,c6,c7,c8,c9,c10,c11,c12,c13,c14,c15,c16,c17,c18,c19,c20,c21,c22,c23,c24,c25,c26,c27,c28,c29,c30,c31,c32,c33,c34,c35,c36,c37,c38,c39,c40,c41,c42,c43,c44,c45,c46,c47,c48,c49,c50,c51,c52,c53,c54,c55,c56,c57,c58,c59,c60) VALUES(now(), '58','9281','7611','367','7371','8353','4269','134','5884','6794','3147','7639','7798','7890','8547','4212','8630','5962','8686','4482','372','7218','6070','5525','1381','9816','5721','3632','5364','3980','6635','9641','518','6394','2560','1202','5595','7466','1507','7783','9586','6724','9169','9673','7867','8509','6889','3540','5994','4290','1925','8924','4704','4987','803','4291','4987','1111','4934','9885','6441','8212','9349','6852');" 1000000 --cassandra.connection.requests.max.local=50 
00:28:27,393 INFO ru.croc.rosstat.csod.store.cassandra.connection.CassandraCluster:-1 - Connection to CassandraSettings$Connection(nodes:[csodx01.lab.croc.ru], port:9042, keyspace:csod, requests:CassandraSettings$Connection$Requests(fetchSize:1000, batchSize:2000, consistencyLevel:LOCAL_QUORUM, max:CassandraSettings$Connection$Requests$Max(local:50, remote:20, retry:CassandraSettings$Connection$Requests$Max$Retry(enabled:true, read:10, write:10, unavailable:5)))) established 

Entering: Overall process 
Entering: Prebuilding of statements 
Leaving [847 ms]: Prebuilding of statements 
Entering: Executing statements async 
Leaving [108564 ms][9211.15655281677 ops/s]: Executing statements async 
Leaving [109413 ms]: Overall process 

yerleştirin: 85 sütun

---

takın 25 sütun

>java -jar store-utils-cli.jar -pt "insert into csod.calc_data_test2(data_set_id, svod_type,section,index_code,value_type,c1,c2,c3,c4,c5,c6,c7,c8,c9,c10,c11,c12,c13,c14,c15,c16,c17,c18,c19,c20,c21,c22,c23,c24,c25,c26,c27,c28,c29,c30,c31,c32,c33,c34,c35,c36,c37,c38,c39,c40) VALUES(now(), '58','9281','7611','367','7371','8353','4269','134','5884','6794','3147','7639','7798','7890','8547','4212','8630','5962','8686','4482','372','7218','6070','5525','1381','9816','5721','3632','5364','3980','6635','9641','518','6394','2560','1202','5595','7466','1507','7783','9586','6724','9169','9673');" 1000000 --cassandra.connection.requests.max.local=50 
00:33:19,972 INFO ru.croc.rosstat.csod.store.cassandra.connection.CassandraCluster:-1 - Connection to CassandraSettings$Connection(nodes:[csodx01.lab.croc.ru], port:9042, keyspace:csod, requests:CassandraSettings$Connection$Requests(fetchSize:1000, batchSize:2000, consistencyLevel:LOCAL_QUORUM, max:CassandraSettings$Connection$Requests$Max(local:50, remote:20, retry:CassandraSettings$Connection$Requests$Max$Retry(enabled:true, read:10, write:10, unavailable:5)))) established 

Entering: Overall process 
Entering: Prebuilding of statements 
Leaving [845 ms]: Prebuilding of statements 
Entering: Executing statements async 
Leaving [78213 ms][12785.598302072545 ops/s]: Executing statements async 
Leaving [79060 ms]: Overall process 

yerleştirin:

>java -jar store-utils-cli-1.2.0-SNAPSHOT.jar -pt "insert into csod.calc_data_test2(data_set_id, svod_type,section,index_code,value_type,c1,c2,c3,c4,c5,c6,c7,c8,c9,c10,c11,c12,c13,c14,c15,c16,c17,c18,c19,c20) VALUES(now(), '58','9281','7611','367','7371','8353','4269','134','5884','6794','3147','7639','7798','7890','8547','4212','8630','5962','8686','4482','372','7218','6070','5525');" 1000000 --cassandra.connection.requests.max.local=50 
00:39:29,337 INFO ru.croc.rosstat.csod.store.cassandra.connection.CassandraCluster:-1 - Connection to CassandraSettings$Connection(nodes:[csodx01.lab.croc.ru], port:9042, keyspace:csod, requests:CassandraSettings$Connection$Requests(fetchSize:1000, batchSize:2000, consistencyLevel:LOCAL_QUORUM, max:CassandraSettings$Connection$Requests$Max(local:50, remote:20, retry:CassandraSettings$Connection$Requests$Max$Retry(enabled:true, read:10, write:10, unavailable:5)))) established 

Entering: Overall process 
Entering: Prebuilding of statements 
Leaving [885 ms]: Prebuilding of statements 
Entering: Executing statements async 
Leaving [68447 ms][14609.844112963314 ops/s]: Executing statements async 
Leaving [69339 ms]: Overall process 

Ve 5 sütun ekleme:

>java -jar store-utils-cli-1.2.0-SNAPSHOT.jar -pt "insert into csod.calc_data_test2(data_set_id, svod_type,section,index_code,value_type) VALUES(now(), '58','9281','7611','367');" 1000000 --cassandra.connection.requests.max.local=50 
00:43:35,293 INFO ru.croc.rosstat.csod.store.cassandra.connection.CassandraCluster:-1 - Connection to CassandraSettings$Connection(nodes:[csodx01.lab.croc.ru], port:9042, keyspace:csod, requests:CassandraSettings$Connection$Requests(fetchSize:1000, batchSize:2000, consistencyLevel:LOCAL_QUORUM, max:CassandraSettings$Connection$Requests$Max(local:50, remote:20, retry:CassandraSettings$Connection$Requests$Max$Retry(enabled:true, read:10, write:10, unavailable:5)))) established 

Entering: Overall process 
Entering: Prebuilding of statements 
Leaving [968 ms]: Prebuilding of statements 
Entering: Executing statements async 
Leaving [49812 ms][20075.483819160043 ops/s]: Executing statements async 
Leaving [50782 ms]: Overall process 

bir ekleme etkilenen sütun sayısı performansına çok büyük bir etkisi olduğu gerçekten doğru mu? Henüz böyle bir bağımlılık hakkında hiçbir bilgi bulamadım. Yanlış bir şey yapıyorum olabilir mi?

uçlar için tüm anlamlı kod buradadır:

override fun run(args: Array<String?>) { 
    if (args.isEmpty() || args.size < 2){ 
     System.err.println("You should specify a query and a number of iterations: ${args.toList()}") 
     return 
    } 

    val query: String? = args[0] 
    val iterationCount: Long = args[1]!!.toLong() 

    // get the session 
    val session: Session = cassandraCluster.connection().driverSession 
    // prepare the query 
    val preparedQuery: PreparedStatement = session.prepare(query) 

    MeasureTime("Overall process").use { 
     // create bound statements 
     val statements = MeasureTime("Prebuild statements").use { 
      (1..iterationCount).map { BoundStatement(preparedQuery) } 
     } 

     // execute async 
     MeasureTime("Execute statements async", iterationCount).use { 
      val phaser = Phaser(1) 
      statements.map { statement -> 
       phaser.register() 
       session.executeAsync(statement).withCallback({ 
        phaser.arriveAndDeregister() 
       }, { err -> 
        System.err.println(err) 
        phaser.arriveAndDeregister() 
       }) 
      } 
      // block until all tasks are done 
      phaser.arriveAndAwaitAdvance() 
     } 
    } 
} 

// extension method for convenience 
private fun <T> ListenableFuture<T>.withCallback(onSuccessCallback: (T?) -> Unit, onFailureCallback: (Throwable?) -> Unit): ListenableFuture<T> { 
    Futures.addCallback(this, object: FutureCallback<T> { 
     override fun onSuccess(p0: T?) { 
      onSuccessCallback(p0) 
     } 

     override fun onFailure(p0: Throwable?) { 
      onFailureCallback(p0) 
     } 
    }) 
    return this 
} 

class MeasureTime(val message: String, val operationCount: Long? = null): Closeable { 
    private val startTime: Long 

    init { 
     startTime = System.nanoTime() 
     System.out.println("Entering: $message") 
    } 

    override fun close() { 
     val endTime = System.nanoTime() 
     val elapsed = (endTime - startTime)/1000000 
     val opStats = if (operationCount != null) { 
      val f = operationCount/elapsed.toDouble()*1000 
      "[$f ops/s]" 
     } else "" 
     val message = "Leaving [$elapsed ms]$opStats: $message" 
     System.out.println(message) 
    } 
} 

Ben Java adam KOTLIN kodunda neler olduğunu anlamak için bir sorun değil inanıyoruz.

Answer 1

İkinci tabloda daha fazla veriyi 1. adıma (c1 ila c100 + çift diğer cols) ekliyorsanız, ekleme işleminin daha yavaş olması normaldir.

1. : Her iki tablolarda (bayt vadede sayım) aynı miktarda veri eklemek bile Şimdi

   , 2 tablodaki ekleme hala çünkü biraz daha yavaş olacaktır meta verilerinin yükü.Birkaç tanesi yerine

2. ve belki unutmak diğer parametreler sütunlarının bir sürü seri hale getirmek için onlara

3. CPU tüketimini saklamak için bellekte oluşturmak için daha fazla nesneleri vardır böylece daha fazla sütuna sahip