cassandra select使用datastax驱动程序不稳定

k97glaaz  于 2021-06-10  发布在  Cassandra
关注(0)|答案(0)|浏览(243)
Versions:
  com.datastax.oss
      -java-driver-core:4.5.0
      -java-driver-query-builder:4.5.0
      -java-driver-mapper-runtime:4.5.0
  cassandra:3.11.5 docker image
  jdk 11.1

我正在运行一个feast的部署，我修改了它，将cassandra用作后端低延迟服务db，用于机器学习功能。我正在成功地写入和读取行，但读取结果与返回的结果不一致。有时有效载荷是空的，我不知道为什么。我已经尝试使用ntp/time.google.com更新到最新的datasax驱动程序并协调时间。我也尝试过改变write to all和read to local\ u one/local\ u quorom的一致性，但没有成功。我真的很难弄明白为什么select不一致。任何洞察力都太好了！）过程如下：我使用cassandraio将行写入cassandra

@Override
  public Future<Void> saveAsync(CassandraMutation entityClass) {
    return mapper.saveAsync(
        entityClass,
        Option.timestamp(entityClass.getWriteTime()),
        Option.ttl(entityClass.getTtl()),
        Option.consistencyLevel(ConsistencyLevel.LOCAL_QUORUM),
        Option.tracing(true));
  }

这似乎成功地将行Map到我的cassandra集群中，然后在我的应用程序中查询该集群，如下所示

List<InetSocketAddress> contactPoints =
         Arrays.stream(cassandraConfig.getBootstrapHosts().split(","))
            .map(h -> new InetSocketAddress(h, cassandraConfig.getPort()))
            .collect(Collectors.toList());
    CqlSession session =
        CqlSession.builder()
            .addContactPoints(contactPoints)
            .withLocalDatacenter(storeProperties.getCassandraDcName())
                .build();
    ....
    PreparedStatement query =
        session.prepare(
            String.format(
                "SELECT entities, feature, value, WRITETIME(value) as writetime FROM %s.%s WHERE entities = ?",
                keyspace, tableName));
    session.execute(
            query
                .bind(key)
                .setTracing(true)
                .setConsistencyLevel(ConsistencyLevel.LOCAL_QUORUM)));

我的问题是，似乎没有发生一致的选择。我已经记录了一段时间了，例如，这里有两个select查询，使用同一个协调器，一个成功，然后随后的select返回结果失败。

cqlsh> select * from system_traces.sessions where session_id=be023400-6a1e-11ea-97ca-6b8bbe3a2a36;

 session_id                           | client        | command | coordinator   | duration | parameters                                                                                                                                                                                                                                                                                                                                              | request                     | started_at
--------------------------------------+---------------+---------+---------------+----------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------------+---------------------------------
 be023400-6a1e-11ea-97ca-6b8bbe3a2a36 | xx.xx.xxx.189 |   QUERY | xx.xx.xxx.158 |    41313 | {'bound_var_0_entities': '''ml_project/test_test_entity:1:entity2_uuid=TenderGreens_8755fff7|entity1_uuid=Zach_Yang_fe7fea92''', 'consistency_level': 'LOCAL_QUORUM', 'page_size': '5000', 'query': 'SELECT entities, feature, value, WRITETIME(value) as writetime FROM feast.feature_store WHERE entities = ?', 'serial_consistency_level': 'SERIAL'} | Execute CQL3 prepared query | 2020-03-19 20:18:05.760000+0000
select event_id, activity, source_elapsed, thread from system_traces.events where session_id=be023400-6a1e-11ea-97ca-6b8bbe3a2a36;
  event_id  |  activity  |  source_elapsed  |  thread
--------------------------------------+---------------------------------------------------------------------------------------------------------------+----------------+-----------------------------------------------------------------------------------------------------------
  be0652b0-6a1e-11ea-97ca-6b8bbe3a2a36  |  Read-repair  DC_LOCAL  |  27087  |  Native-Transport-Requests-1
  be0679c0-6a1e-11ea-97ca-6b8bbe3a2a36  |  reading  data  from  /xx.xx.xxx.161  |  28034  |  Native-Transport-Requests-1
  be06a0d0-6a1e-11ea-97ca-6b8bbe3a2a36  |  Sending  READ  message  to  /xx.xx.xxx.161  |  28552  |  MessagingService-Outgoing-/xx.xx.xxx.161-Small
  be06a0d1-6a1e-11ea-97ca-6b8bbe3a2a36  |  reading  digest  from  /xx.xx.xxx.162  |  28595  |  Native-Transport-Requests-1
  be06a0d2-6a1e-11ea-97ca-6b8bbe3a2a36  |  Executing  single-partition  query  on  feature_store  |  28598  |  ReadStage-3
  be06a0d3-6a1e-11ea-97ca-6b8bbe3a2a36  |  Acquiring  sstable  references  |  28689  |  ReadStage-3
  be06a0d4-6a1e-11ea-97ca-6b8bbe3a2a36  |  reading  digest  from  /xx.xx.xx.138  |  28852  |  Native-Transport-Requests-1
  be06a0d5-6a1e-11ea-97ca-6b8bbe3a2a36  |  Sending  READ  message  to  /xx.xx.xxx.162  |  28904  |  MessagingService-Outgoing-/xx.xx.xxx.162-Small
  be06a0d6-6a1e-11ea-97ca-6b8bbe3a2a36  |  Bloom  filter  allows  skipping  sstable  56  |  28937  |  ReadStage-3
  be06a0d7-6a1e-11ea-97ca-6b8bbe3a2a36  |  reading  digest  from  /xx.xx.xxx.171  |  28983  |  Native-Transport-Requests-1
  be06a0d8-6a1e-11ea-97ca-6b8bbe3a2a36  |  Bloom  filter  allows  skipping  sstable  55  |  29020  |  ReadStage-3
  be06a0d9-6a1e-11ea-97ca-6b8bbe3a2a36  |  Sending  READ  message  to  cassandra-feature-store-1.cassandra-feature-store.team-data/xx.xx.xx.138  |  29071  |  MessagingService-Outgoing-cassandra-feature-store-1.cassandra-feature-store.team-data/xx.xx.xx.138-Small
  be06a0da-6a1e-11ea-97ca-6b8bbe3a2a36  |  Bloom  filter  allows  skipping  sstable  54  |  29181  |  ReadStage-3
  be06a0db-6a1e-11ea-97ca-6b8bbe3a2a36  |  Sending  READ  message  to  cassandra-feature-store-0.cassandra-feature-store.team-data/xx.xx.xxx.171  |  29201  |  MessagingService-Outgoing-cassandra-feature-store-0.cassandra-feature-store.team-data/xx.xx.xx.171-Small
  be06c7e0-6a1e-11ea-80ad-dffaf3fb56b4  |  READ  message  received  from  /xx.xx.xxx.158  |  33  |  MessagingService-Incoming-/xx.xx.xxx.158
  be06c7e0-6a1e-11ea-8693-577fec389856  |  READ  message  received  from  /xx.xx.xxx.158  |  34  |  MessagingService-Incoming-/xx.xx.xxx.158
  be06c7e0-6a1e-11ea-8b1a-e5aa876f7d0d  |  READ  message  received  from  /xx.xx.xxx.158  |  29  |  MessagingService-Incoming-/xx.xx.xxx.158
  be06c7e0-6a1e-11ea-8d2e-c5837edad3d1  |  READ  message  received  from  /xx.xx.xxx.158  |  44  |  MessagingService-Incoming-/xx.xx.xxx.158
  be06c7e0-6a1e-11ea-97ca-6b8bbe3a2a36  |  Bloom  filter  allows  skipping  sstable  41  |  29273  |  ReadStage-3
  be06c7e1-6a1e-11ea-80ad-dffaf3fb56b4  |  Executing  single-partition  query  on  feature_store  |  389  |  ReadStage-1
  be06c7e1-6a1e-11ea-8b1a-e5aa876f7d0d  |  Executing  single-partition  query  on  feature_store  |  513  |  ReadStage-1
  be06c7e1-6a1e-11ea-97ca-6b8bbe3a2a36  |  Skipped  0/4  non-slice-intersecting  sstables,  included  0  due  to  tombstones  |  29342  |  ReadStage-3
  be06c7e2-6a1e-11ea-80ad-dffaf3fb56b4  |  Acquiring  sstable  references  |  457  |  ReadStage-1
  be06c7e3-6a1e-11ea-80ad-dffaf3fb56b4  |  Bloom  filter  allows  skipping  sstable  55  |  620  |  ReadStage-1
  be06c7e4-6a1e-11ea-80ad-dffaf3fb56b4  |  Bloom  filter  allows  skipping  sstable  54  |  659  |  ReadStage-1
  be06c7e5-6a1e-11ea-80ad-dffaf3fb56b4  |  Bloom  filter  allows  skipping  sstable  41  |  677  |  ReadStage-1
  be06c7e6-6a1e-11ea-80ad-dffaf3fb56b4  |  Skipped  0/3  non-slice-intersecting  sstables,  included  0  due  to  tombstones  |  695  |  ReadStage-1
  be06eef0-6a1e-11ea-80ad-dffaf3fb56b4  |  Merged  data  from  memtables  and  0  sstables  |  1039  |  ReadStage-1
  be06eef0-6a1e-11ea-8693-577fec389856  |  Executing  single-partition  query  on  feature_store  |  372  |  ReadStage-1
  be06eef0-6a1e-11ea-8b1a-e5aa876f7d0d  |  Acquiring  sstable  references  |  583  |  ReadStage-1
  be06eef0-6a1e-11ea-8d2e-c5837edad3d1  |  Executing  single-partition  query  on  feature_store  |  454  |  ReadStage-1
  be06eef0-6a1e-11ea-97ca-6b8bbe3a2a36  |  Merged  data  from  memtables  and  0  sstables  |  30372  |  ReadStage-3
  be06eef1-6a1e-11ea-80ad-dffaf3fb56b4  |  Read  16  live  rows  and  0  tombstone  cells  |  1125  |  ReadStage-1
  be06eef1-6a1e-11ea-8693-577fec389856  |  Acquiring  sstable  references  |  493  |  ReadStage-1
  be06eef1-6a1e-11ea-8b1a-e5aa876f7d0d  |  Bloom  filter  allows  skipping  sstable  54  |  703  |  ReadStage-1
  be06eef1-6a1e-11ea-8d2e-c5837edad3d1  |  Acquiring  sstable  references  |  530  |  ReadStage-1
  be06eef1-6a1e-11ea-97ca-6b8bbe3a2a36  |  Read  16  live  rows  and  0  tombstone  cells  |  30484  |  ReadStage-3
  be06eef2-6a1e-11ea-80ad-dffaf3fb56b4  |  Enqueuing  response  to  /xx.xx.xxx.158  |  1155  |  ReadStage-1
  be06eef2-6a1e-11ea-8693-577fec389856  |  Bloom  filter  allows  skipping  sstable  56  |  721  |  ReadStage-1
  be06eef2-6a1e-11ea-8b1a-e5aa876f7d0d  |  Bloom  filter  allows  skipping  sstable  41  |  740  |  ReadStage-1
  be06eef2-6a1e-11ea-8d2e-c5837edad3d1  |  Bloom  filter  allows  skipping  sstable  56  |  655  |  ReadStage-1
  be06eef3-6a1e-11ea-80ad-dffaf3fb56b4  |  Sending  REQUEST_RESPONSE  message  to  cassandra-feature-store-2.cassandra-feature-store.team-data/xx.xx.xxx.158  |  1492  |  MessagingService-Outgoing-cassandra-feature-store-2.cassandra-feature-store.team-data/xx.xx.xxx.158-Small
  be06eef3-6a1e-11ea-8693-577fec389856  |  Bloom  filter  allows  skipping  sstable  55  |  780  |  ReadStage-1
  be06eef3-6a1e-11ea-8b1a-e5aa876f7d0d  |  Skipped  0/2  non-slice-intersecting  sstables,  included  0  due  to  tombstones  |  761  |  ReadStage-1
  be06eef3-6a1e-11ea-8d2e-c5837edad3d1  |  Bloom  filter  allows  skipping  sstable  55  |  686  |  ReadStage-1
  be06eef4-6a1e-11ea-8693-577fec389856  |  Bloom  filter  allows  skipping  sstable  54  |  815  |  ReadStage-1
  be06eef4-6a1e-11ea-8b1a-e5aa876f7d0d  |  Merged  data  from  memtables  and  0  sstables  |  1320  |  ReadStage-1
  be06eef4-6a1e-11ea-8d2e-c5837edad3d1  |  Bloom  filter  allows  skipping  sstable  54  |  705  |  ReadStage-1
  be06eef5-6a1e-11ea-8693-577fec389856  |  Bloom  filter  allows  skipping  sstable  41  |  839  |  ReadStage-1
  be06eef5-6a1e-11ea-8b1a-e5aa876f7d0d  |  Read  16  live  rows  and  0  tombstone  cells  |  1495  |  ReadStage-1
  be06eef5-6a1e-11ea-8d2e-c5837edad3d1  |  Bloom  filter  allows  skipping  sstable  41  |  720  |  ReadStage-1
  be06eef6-6a1e-11ea-8693-577fec389856  |  Skipped  0/4  non-slice-intersecting  sstables,  included  0  due  to  tombstones  |  871  |  ReadStage-1
  be06eef6-6a1e-11ea-8b1a-e5aa876f7d0d  |  Enqueuing  response  to  /xx.xx.xxx.158  |  1554  |  ReadStage-1
  be06eef6-6a1e-11ea-8d2e-c5837edad3d1  |  Skipped  0/4  non-slice-intersecting  sstables,  included  0  due  to  tombstones  |  738  |  ReadStage-1
  be06eef7-6a1e-11ea-8d2e-c5837edad3d1  |  Merged  data  from  memtables  and  0  sstables  |  1157  |  ReadStage-1
  be06eef8-6a1e-11ea-8d2e-c5837edad3d1  |  Read  16  live  rows  and  0  tombstone  cells  |  1296  |  ReadStage-1
  be06eef9-6a1e-11ea-8d2e-c5837edad3d1  |  Enqueuing  response  to  /xx.xx.xxx.158  |  1325  |  ReadStage-1
  be071600-6a1e-11ea-8693-577fec389856  |  Merged  data  from  memtables  and  0  sstables  |  1592  |  ReadStage-1
  be071600-6a1e-11ea-8b1a-e5aa876f7d0d  |  Sending  REQUEST_RESPONSE  message  to  cassandra-feature-store-2.cassandra-feature-store.team-data/xx.xx.xxx.158  |  1783  |  MessagingService-Outgoing-cassandra-feature-store-2.cassandra-feature-store.team-data/xx.xx.xxx.158-Small
  be071600-6a1e-11ea-8d2e-c5837edad3d1  |  Sending  REQUEST_RESPONSE  message  to  /xx.xx.xxx.158  |  1484  |  MessagingService-Outgoing-/xx.xx.xxx.158-Small
  be071600-6a1e-11ea-97ca-6b8bbe3a2a36  |  REQUEST_RESPONSE  message  received  from  /xx.xx.xxx.161  |  31525  |  MessagingService-Incoming-/xx.xx.xxx.161
  be071601-6a1e-11ea-8693-577fec389856  |  Read  16  live  rows  and  0  tombstone  cells  |  1754  |  ReadStage-1
  be071601-6a1e-11ea-97ca-6b8bbe3a2a36  |  Processing  response  from  /xx.xx.xxx.161  |  31650  |  RequestResponseStage-4
  be071602-6a1e-11ea-8693-577fec389856  |  Enqueuing  response  to  /xx.xx.xxx.158  |  1796  |  ReadStage-1
  be071602-6a1e-11ea-97ca-6b8bbe3a2a36  |  REQUEST_RESPONSE  message  received  from  /xx.xx.xx.138  |  31795  |  MessagingService-Incoming-/xx.xx.xx.138
  be071603-6a1e-11ea-8693-577fec389856  |  Sending  REQUEST_RESPONSE  message  to  /xx.xx.xxx.158  |  1973  |  MessagingService-Outgoing-/xx.xx.xxx.158-Small
  be071603-6a1e-11ea-97ca-6b8bbe3a2a36  |  Processing  response  from  /xx.xx.xx.138  |  31872  |  RequestResponseStage-4
  be071604-6a1e-11ea-97ca-6b8bbe3a2a36  |  REQUEST_RESPONSE  message  received  from  /xx.xx.xxx.162  |  31918  |  MessagingService-Incoming-/xx.xx.xxx.162
  be071605-6a1e-11ea-97ca-6b8bbe3a2a36  |  Processing  response  from  /xx.xx.xxx.162  |  32047  |  RequestResponseStage-4
  be073d10-6a1e-11ea-97ca-6b8bbe3a2a36  |  REQUEST_RESPONSE  message  received  from  /xx.xx.xxx.171  |  32688  |  MessagingService-Incoming-/xx.xx.xx.171
  be073d11-6a1e-11ea-97ca-6b8bbe3a2a36  |  Processing  response  from  /xx.xx.xxx.171  |  32827  |  RequestResponseStage-2
  be073d12-6a1e-11ea-97ca-6b8bbe3a2a36  |  Initiating  read-repair  |  32985  |  RequestResponseStage-2

失败：

cqlsh> select * from system_traces.sessions where session_id=472551e0-6a1f-11ea-97ca-6b8bbe3a2a36;

 session_id                           | client        | command | coordinator   | duration | parameters                                                                                                                                                                                                                                                                                                                                              | request                     | started_at
--------------------------------------+---------------+---------+---------------+----------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------------+---------------------------------
 472551e0-6a1f-11ea-97ca-6b8bbe3a2a36 | xx.xx.xxx.189 |   QUERY | xx.xx.xxx.158 |     3044 | {'bound_var_0_entities': '''ml_project/test_test_entity:1:entity1_uuid=Zach_Yang_fe7fea92|entity2_uuid=TenderGreens_8755fff7''', 'consistency_level': 'LOCAL_QUORUM', 'page_size': '5000', 'query': 'SELECT entities, feature, value, WRITETIME(value) as writetime FROM feast.feature_store WHERE entities = ?', 'serial_consistency_level': 'SERIAL'} | Execute CQL3 prepared query | 2020-03-19 20:21:55.838000+0000
cqlsh> select event_id, activity, source_elapsed, thread from system_traces.events where session_id=472551e0-6a1f-11ea-97ca-6b8bbe3a2a36;
  event_id  |  activity  |  source_elapsed  |  thread
--------------------------------------+---------------------------------------------------------------------------------------------------------------+----------------+-----------------------------------------------------------------------------------------------------------
  472578f0-6a1f-11ea-80ad-dffaf3fb56b4  |  READ  message  received  from  /xx.xx.xxx.158  |  18  |  MessagingService-Incoming-/xx.xx.xxx.158
  472578f0-6a1f-11ea-97ca-6b8bbe3a2a36  |  reading  digest  from  /xx.xx.xxx.138  |  619  |  Native-Transport-Requests-1
  472578f1-6a1f-11ea-97ca-6b8bbe3a2a36  |  Executing  single-partition  query  on  feature_store  |  708  |  ReadStage-2
  472578f2-6a1f-11ea-97ca-6b8bbe3a2a36  |  reading  digest  from  /xx.xx.xxx.161  |  755  |  Native-Transport-Requests-1
  472578f3-6a1f-11ea-97ca-6b8bbe3a2a36  |  Acquiring  sstable  references  |  768  |  ReadStage-2
  472578f4-6a1f-11ea-97ca-6b8bbe3a2a36  |  Sending  READ  message  to  cassandra-feature-store-1.cassandra-feature-store.team-data/xx.xx.xxx.138  |  836  |  MessagingService-Outgoing-cassandra-feature-store-1.cassandra-feature-store.team-data/xx.xx.xxx.138-Small
  472578f5-6a1f-11ea-97ca-6b8bbe3a2a36  |  Bloom  filter  allows  skipping  sstable  56  |  859  |  ReadStage-2
  472578f6-6a1f-11ea-97ca-6b8bbe3a2a36  |  speculating  read  retry  on  /xx.xx.xx.171  |  862  |  Native-Transport-Requests-1
  472578f7-6a1f-11ea-97ca-6b8bbe3a2a36  |  Sending  READ  message  to  /xx.xx.xxx.161  |  893  |  MessagingService-Outgoing-/xx.xx.xxx.161-Small
  472578f8-6a1f-11ea-97ca-6b8bbe3a2a36  |  Bloom  filter  allows  skipping  sstable  55  |  903  |  ReadStage-2
  472578f9-6a1f-11ea-97ca-6b8bbe3a2a36  |  Bloom  filter  allows  skipping  sstable  54  |  929  |  ReadStage-2
  472578fa-6a1f-11ea-97ca-6b8bbe3a2a36  |  Sending  READ  message  to  cassandra-feature-store-0.cassandra-feature-store.team-data/xx.xx.xx.171  |  982  |  MessagingService-Outgoing-cassandra-feature-store-0.cassandra-feature-store.team-data/xx.xx.xx.171-Small
  472578fb-6a1f-11ea-97ca-6b8bbe3a2a36  |  Bloom  filter  allows  skipping  sstable  41  |  996  |  ReadStage-2
  472578fc-6a1f-11ea-97ca-6b8bbe3a2a36  |  Skipped  0/4  non-slice-intersecting  sstables,  included  0  due  to  tombstones  |  1039  |  ReadStage-2
  472578fd-6a1f-11ea-97ca-6b8bbe3a2a36  |  Merged  data  from  memtables  and  0  sstables  |  1227  |  ReadStage-2
  472578fe-6a1f-11ea-97ca-6b8bbe3a2a36  |  Read  0  live  rows  and  0  tombstone  cells  |  1282  |  ReadStage-2
  4725a000-6a1f-11ea-80ad-dffaf3fb56b4  |  Executing  single-partition  query  on  feature_store  |  226  |  ReadStage-2
  4725a000-6a1f-11ea-8693-577fec389856  |  READ  message  received  from  /xx.xx.xxx.158  |  12  |  MessagingService-Incoming-/xx.xx.xxx.158
  4725a000-6a1f-11ea-8d2e-c5837edad3d1  |  READ  message  received  from  /xx.xx.xxx.158  |  15  |  MessagingService-Incoming-/xx.xx.xxx.158
  4725a001-6a1f-11ea-80ad-dffaf3fb56b4  |  Acquiring  sstable  references  |  297  |  ReadStage-2
  4725a001-6a1f-11ea-8693-577fec389856  |  Executing  single-partition  query  on  feature_store  |  258  |  ReadStage-1
  4725a001-6a1f-11ea-8d2e-c5837edad3d1  |  Executing  single-partition  query  on  feature_store  |  230  |  ReadStage-1
  4725a002-6a1f-11ea-80ad-dffaf3fb56b4  |  Bloom  filter  allows  skipping  sstable  55  |  397  |  ReadStage-2
  4725a002-6a1f-11ea-8693-577fec389856  |  Acquiring  sstable  references  |  327  |  ReadStage-1
  4725a002-6a1f-11ea-8d2e-c5837edad3d1  |  Acquiring  sstable  references  |  297  |  ReadStage-1
  4725a003-6a1f-11ea-80ad-dffaf3fb56b4  |  Bloom  filter  allows  skipping  sstable  54  |  433  |  ReadStage-2
  4725a003-6a1f-11ea-8693-577fec389856  |  Bloom  filter  allows  skipping  sstable  56  |  451  |  ReadStage-1
  4725a003-6a1f-11ea-8d2e-c5837edad3d1  |  Bloom  filter  allows  skipping  sstable  56  |  439  |  ReadStage-1
  4725a004-6a1f-11ea-80ad-dffaf3fb56b4  |  Bloom  filter  allows  skipping  sstable  41  |  450  |  ReadStage-2
  4725a004-6a1f-11ea-8693-577fec389856  |  Bloom  filter  allows  skipping  sstable  55  |  512  |  ReadStage-1
  4725a004-6a1f-11ea-8d2e-c5837edad3d1  |  Bloom  filter  allows  skipping  sstable  55  |  492  |  ReadStage-1
  4725a005-6a1f-11ea-80ad-dffaf3fb56b4  |  Skipped  0/3  non-slice-intersecting  sstables,  included  0  due  to  tombstones  |  466  |  ReadStage-2
  4725a005-6a1f-11ea-8693-577fec389856  |  Bloom  filter  allows  skipping  sstable  54  |  570  |  ReadStage-1
  4725a005-6a1f-11ea-8d2e-c5837edad3d1  |  Bloom  filter  allows  skipping  sstable  54  |  513  |  ReadStage-1
  4725a006-6a1f-11ea-80ad-dffaf3fb56b4  |  Merged  data  from  memtables  and  0  sstables  |  648  |  ReadStage-2
  4725a006-6a1f-11ea-8693-577fec389856  |  Bloom  filter  allows  skipping  sstable  41  |  606  |  ReadStage-1
  4725a006-6a1f-11ea-8d2e-c5837edad3d1  |  Bloom  filter  allows  skipping  sstable  41  |  526  |  ReadStage-1
  4725a007-6a1f-11ea-80ad-dffaf3fb56b4  |  Read  0  live  rows  and  0  tombstone  cells  |  708  |  ReadStage-2
  4725a007-6a1f-11ea-8693-577fec389856  |  Skipped  0/4  non-slice-intersecting  sstables,  included  0  due  to  tombstones  |  631  |  ReadStage-1
  4725a007-6a1f-11ea-8d2e-c5837edad3d1  |  Skipped  0/4  non-slice-intersecting  sstables,  included  0  due  to  tombstones  |  542  |  ReadStage-1
  4725a008-6a1f-11ea-80ad-dffaf3fb56b4  |  Enqueuing  response  to  /xx.xx.xxx.158  |  727  |  ReadStage-2
  4725a008-6a1f-11ea-8d2e-c5837edad3d1  |  Merged  data  from  memtables  and  0  sstables  |  700  |  ReadStage-1
  4725a009-6a1f-11ea-80ad-dffaf3fb56b4  |  Sending  REQUEST_RESPONSE  message  to  cassandra-feature-store-2.cassandra-feature-store.team-data/xx.xx.xxx.158  |  838  |  MessagingService-Outgoing-cassandra-feature-store-2.cassandra-feature-store.team-data/xx.xx.xxx.158-Small
  4725a009-6a1f-11ea-8d2e-c5837edad3d1  |  Read  0  live  rows  and  0  tombstone  cells  |  756  |  ReadStage-1
  4725a00a-6a1f-11ea-8d2e-c5837edad3d1  |  Enqueuing  response  to  /xx.xx.xxx.158  |  772  |  ReadStage-1
  4725a00b-6a1f-11ea-8d2e-c5837edad3d1  |  Sending  REQUEST_RESPONSE  message  to  /xx.xx.xxx.158  |  914  |  MessagingService-Outgoing-/xx.xx.xxx.158-Small
  4725c710-6a1f-11ea-8693-577fec389856  |  Merged  data  from  memtables  and  0  sstables  |  845  |  ReadStage-1
  4725c710-6a1f-11ea-97ca-6b8bbe3a2a36  |  REQUEST_RESPONSE  message  received  from  /xx.xx.xxx.161  |  2327  |  MessagingService-Incoming-/xx.xx.xxx.161
  4725c711-6a1f-11ea-8693-577fec389856  |  Read  0  live  rows  and  0  tombstone  cells  |  905  |  ReadStage-1
  4725c711-6a1f-11ea-97ca-6b8bbe3a2a36  |  Processing  response  from  /xx.xx.xxx.161  |  2443  |  RequestResponseStage-2
  4725c712-6a1f-11ea-8693-577fec389856  |  Enqueuing  response  to  /xx.xx.xxx.158  |  929  |  ReadStage-1
  4725c712-6a1f-11ea-97ca-6b8bbe3a2a36  |  REQUEST_RESPONSE  message  received  from  /xx.xx.xxx.138  |  2571  |  MessagingService-Incoming-/xx.xx.xxx.138
  4725c713-6a1f-11ea-8693-577fec389856  |  Sending  REQUEST_RESPONSE  message  to  /xx.xx.xxx.158  |  1023  |  MessagingService-Outgoing-/xx.xx.xxx.158-Small
  4725c713-6a1f-11ea-97ca-6b8bbe3a2a36  |  Processing  response  from  /xx.xx.xxx.138  |  2712  |  RequestResponseStage-2
  4725c714-6a1f-11ea-97ca-6b8bbe3a2a36  |  REQUEST_RESPONSE  message  received  from  /xx.xx.xx.171  |  2725  |  MessagingService-Incoming-/xx.xx.xx.171
  4725c715-6a1f-11ea-97ca-6b8bbe3a2a36  |  Processing  response  from  /xx.xx.xx.171  |  2797  |  RequestResponseStage-2
  4725c716-6a1f-11ea-97ca-6b8bbe3a2a36  |  Initiating  read-repair  |  2855  |  RequestResponseStage-2

键空间信息

cqlsh> describe keyspace feast;

CREATE KEYSPACE feast WITH replication = {'class': 'NetworkTopologyStrategy', 'stage-us-west1': '5'}  AND durable_writes = true;

CREATE TABLE feast.feature_store (
    entities text,
    feature text,
    value blob,
    PRIMARY KEY (entities, feature)
) WITH CLUSTERING ORDER BY (feature 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.SizeTieredCompactionStrategy', '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';
cassandraapache-beamdatastaxcassandra-3.0feast

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