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From "Aleksey Yeschenko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5975) Filtering on Secondary Index Takes a Long Time Even with Limit 1, Trace Log Filled with Looping Messages
Date Fri, 06 Sep 2013 21:29:52 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13760653#comment-13760653 ] 

Aleksey Yeschenko commented on CASSANDRA-5975:
----------------------------------------------

There are two issues here.

1. https://github.com/apache/cassandra/blob/cassandra-1.2/src/java/org/apache/cassandra/db/ColumnFamilyStore.java#L1530 will never actually do anything, because filter.lastCounted(data) will always return 0, since CompositesSearcher does not use the original filter at all (except to get limit, which never gets updated), so the condition at https://github.com/apache/cassandra/blob/cassandra-1.2/src/java/org/apache/cassandra/db/ColumnFamilyStore.java#L1500 is equivalent to {monospaced}while (rowIterator.hasNext()){monospaced}.

2. https://github.com/apache/cassandra/blob/cassandra-1.2/src/java/org/apache/cassandra/db/index/composites/CompositesSearcher.java#L198 always resets columnsCount to 0, so the checks like https://github.com/apache/cassandra/blob/cassandra-1.2/src/java/org/apache/cassandra/db/index/composites/CompositesSearcher.java#L205 and https://github.com/apache/cassandra/blob/cassandra-1.2/src/java/org/apache/cassandra/db/index/composites/CompositesSearcher.java#L250 are basically useless, too.

with 1 and 2 there is nothing to stop the iteration, so it goes on until it exhausts all the matching indexed entries. The easiest fix seems to be to move limit and count one level up and treat the limit as immutable, and deal with it entirely in CompositesSearcher. Attaching a v2, with some unrelated minor cleanups that get rid of all the warnings, while at it.
                
> Filtering on Secondary Index Takes a Long Time Even with Limit 1, Trace Log Filled with Looping Messages
> --------------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-5975
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5975
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>         Environment: Ubuntu, Single Node
>            Reporter: Russell Alexander Spitzer
>            Assignee: Alex Liu
>         Attachments: 5975-1.2-branch.txt, 5975-v2.txt, create_data.py, trace.log
>
>
> After creating a table with 300,000 keys. Attempting to filter on a column with a secondary index causes an rpc timeout. Using a limit statement does not alleviate the problem. The tracing log appears to be filled with the same set of messages repeated over and over until the query times out. 
> The data was created with the attached script and the command
> {code}
> python create_data.py --num-keys 300000 --num-columns 50 --keyspace 'ks' --columnfamily cf_300000_keys_50_cols --create-index y -v 3
> {code}
> The query causing the delay is
> {code}
> select * from cf_300000_keys_50_cols where color = 'green' limit 1;
> {code}
> An excerpt of the trace log
> {code}
> Tracing session: cedbead0-14d7-11e3-915e-999f6c86239a
>  activity                                                                          | timestamp    | source       | source_elapsed
> -----------------------------------------------------------------------------------+--------------+--------------+----------------
>                                                                 execute_cql3_query | 20:31:27,230 | 10.196.1.106 |              0
>        Parsing select * from cf_300000_keys_50_cols where color = 'green' limit 1; | 20:31:27,230 | 10.196.1.106 |             31
>                                                                 Peparing statement | 20:31:27,230 | 10.196.1.106 |            219
>                                                      Determining replicas to query | 20:31:27,230 | 10.196.1.106 |            563
>  Executing indexed scan for [min(-9223372036854775808), min(-9223372036854775808)] | 20:31:27,232 | 10.196.1.106 |           1816
>                   Executing single-partition query on cf_300000_keys_50_cols.color | 20:31:27,232 | 10.196.1.106 |           2036
>                                                       Acquiring sstable references | 20:31:27,232 | 10.196.1.106 |           2201
>                                                        Merging memtable tombstones | 20:31:27,232 | 10.196.1.106 |           2345
>                                                        Key cache hit for sstable 3 | 20:31:27,232 | 10.196.1.106 |           2493
>                                        Seeking to partition beginning in data file | 20:31:27,232 | 10.196.1.106 |           2555
>                                                        Key cache hit for sstable 1 | 20:31:27,234 | 10.196.1.106 |           3742
>                                        Seeking to partition beginning in data file | 20:31:27,234 | 10.196.1.106 |           3806
>                                         Merging data from memtables and 2 sstables | 20:31:27,236 | 10.196.1.106 |           5805
>                                                 Read 3 live and 0 tombstoned cells | 20:31:27,236 | 10.196.1.106 |           5977
>                         Executing single-partition query on cf_300000_keys_50_cols | 20:31:27,236 | 10.196.1.106 |           6166
>                                                       Acquiring sstable references | 20:31:27,236 | 10.196.1.106 |           6319
>                                                        Merging memtable tombstones | 20:31:27,236 | 10.196.1.106 |           6382
>                                                        Key cache hit for sstable 3 | 20:31:27,236 | 10.196.1.106 |           6421
>                                        Seeking to partition beginning in data file | 20:31:27,236 | 10.196.1.106 |           6423
>                                             Bloom filter allows skipping sstable 2 | 20:31:27,237 | 10.196.1.106 |           7060
>                                             Bloom filter allows skipping sstable 1 | 20:31:27,237 | 10.196.1.106 |           7218
>                                         Merging data from memtables and 1 sstables | 20:31:27,237 | 10.196.1.106 |           7358
>                                                 Read 1 live and 0 tombstoned cells | 20:31:27,238 | 10.196.1.106 |           7644
>                         Executing single-partition query on cf_300000_keys_50_cols | 20:31:27,238 | 10.196.1.106 |           7855
>                                                       Acquiring sstable references | 20:31:27,238 | 10.196.1.106 |           8008
>                                                        Merging memtable tombstones | 20:31:27,238 | 10.196.1.106 |           8072
>                                             Bloom filter allows skipping sstable 3 | 20:31:27,238 | 10.196.1.106 |           8225
>                                             Bloom filter allows skipping sstable 2 | 20:31:27,238 | 10.196.1.106 |           8284
>                                                        Key cache hit for sstable 1 | 20:31:27,238 | 10.196.1.106 |           8367
>                                        Seeking to partition beginning in data file | 20:31:27,238 | 10.196.1.106 |           8468
>                                         Merging data from memtables and 1 sstables | 20:31:27,239 | 10.196.1.106 |           8968
>                                                 Read 1 live and 0 tombstoned cells | 20:31:27,239 | 10.196.1.106 |           9234
>                   Executing single-partition query on cf_300000_keys_50_cols.color | 20:31:27,239 | 10.196.1.106 |           9405
>                                                       Acquiring sstable references | 20:31:27,239 | 10.196.1.106 |           9547
>                                                        Merging memtable tombstones | 20:31:27,240 | 10.196.1.106 |           9608
>                                                        Key cache hit for sstable 3 | 20:31:27,240 | 10.196.1.106 |           9700
>                                  Seeking to partition indexed section in data file | 20:31:27,240 | 10.196.1.106 |           9884
>                                                        Key cache hit for sstable 1 | 20:31:27,240 | 10.196.1.106 |          10005
>                                  Seeking to partition indexed section in data file | 20:31:27,240 | 10.196.1.106 |          10175
>                                         Merging data from memtables and 2 sstables | 20:31:27,240 | 10.196.1.106 |          10323
>                                                 Read 3 live and 0 tombstoned cells | 20:31:27,249 | 10.196.1.106 |          19358
>                         Executing single-partition query on cf_300000_keys_50_cols | 20:31:27,249 | 10.196.1.106 |          19516
>                                                       Acquiring sstable references | 20:31:27,249 | 10.196.1.106 |          19580
>                                                        Merging memtable tombstones | 20:31:27,250 | 10.196.1.106 |          19670
>                                                        Key cache hit for sstable 3 | 20:31:27,250 | 10.196.1.106 |          19765
>                                        Seeking to partition beginning in data file | 20:31:27,250 | 10.196.1.106 |          19884
>                                             Bloom filter allows skipping sstable 2 | 20:31:27,250 | 10.196.1.106 |          20357
>                                             Bloom filter allows skipping sstable 1 | 20:31:27,250 | 10.196.1.106 |          20514
>                                         Merging data from memtables and 1 sstables | 20:31:27,250 | 10.196.1.106 |          20576
>                                                 Read 1 live and 0 tombstoned cells | 20:31:27,251 | 10.196.1.106 |          20864
>                   Executing single-partition query on cf_300000_keys_50_cols.color | 20:31:27,251 | 10.196.1.106 |          21072
>                                                       Acquiring sstable references | 20:31:27,251 | 10.196.1.106 |          21137
>                                                        Merging memtable tombstones | 20:31:27,251 | 10.196.1.106 |          21315
>                                                        Key cache hit for sstable 3 | 20:31:27,251 | 10.196.1.106 |          21461
>                                  Seeking to partition indexed section in data file | 20:31:27,252 | 10.196.1.106 |          21599
>                                                        Key cache hit for sstable 1 | 20:31:27,252 | 10.196.1.106 |          21761
>                                  Seeking to partition indexed section in data file | 20:31:27,252 | 10.196.1.106 |          21909
>                                         Merging data from memtables and 2 sstables | 20:31:27,252 | 10.196.1.106 |          21977
>                                                 Read 3 live and 0 tombstoned cells | 20:31:27,261 | 10.196.1.106 |          30678
>                         Executing single-partition query on cf_300000_keys_50_cols | 20:31:27,261 | 10.196.1.106 |          31153
>                                                       Acquiring sstable references | 20:31:27,261 | 10.196.1.106 |          31156
>                                                        Merging memtable tombstones | 20:31:27,261 | 10.196.1.106 |          31221
>                                                        Key cache hit for sstable 3 | 20:31:27,261 | 10.196.1.106 |          31259
>                                        Seeking to partition beginning in data file | 20:31:27,261 | 10.196.1.106 |          31261
>                                             Bloom filter allows skipping sstable 2 | 20:31:27,264 | 10.196.1.106 |          33808
>                                             Bloom filter allows skipping sstable 1 | 20:31:27,264 | 10.196.1.106 |          33875
>                                         Merging data from memtables and 1 sstables | 20:31:27,264 | 10.196.1.106 |          33877
>                                                 Read 1 live and 0 tombstoned cells | 20:31:27,264 | 10.196.1.106 |          34313
>                   Executing single-partition query on cf_300000_keys_50_cols.color | 20:31:27,264 | 10.196.1.106 |          34488
>                                                       Acquiring sstable references | 20:31:27,264 | 10.196.1.106 |          34552
>                                                        Merging memtable tombstones | 20:31:27,265 | 10.196.1.106 |          34642
>                                                        Key cache hit for sstable 3 | 20:31:27,265 | 10.196.1.106 |          34792
>                                  Seeking to partition indexed section in data file | 20:31:27,265 | 10.196.1.106 |          34851
>                                                        Key cache hit for sstable 1 | 20:31:27,265 | 10.196.1.106 |          35007
>                                  Seeking to partition indexed section in data file | 20:31:27,265 | 10.196.1.106 |          35066
>                                         Merging data from memtables and 2 sstables | 20:31:27,265 | 10.196.1.106 |          35272
>                                                 Read 3 live and 0 tombstoned cells | 20:31:27,274 | 10.196.1.106 |          44333
>                         Executing single-partition query on cf_300000_keys_50_cols | 20:31:27,274 | 10.196.1.106 |          44529
>                                                       Acquiring sstable references | 20:31:27,275 | 10.196.1.106 |          44686
>                                                        Merging memtable tombstones | 20:31:27,275 | 10.196.1.106 |          44752
>                                             Bloom filter allows skipping sstable 3 | 20:31:27,275 | 10.196.1.106 |          44766
>                                             Bloom filter allows skipping sstable 2 | 20:31:27,275 | 10.196.1.106 |          45021
>                                                        Key cache hit for sstable 1 | 20:31:27,275 | 10.196.1.106 |          45163
>                                        Seeking to partition beginning in data file | 20:31:27,275 | 10.196.1.106 |          45241
>                                         Merging data from memtables and 1 sstables | 20:31:27,276 | 10.196.1.106 |          45719
>                                                 Read 1 live and 0 tombstoned cells | 20:31:27,276 | 10.196.1.106 |          45985
>                   Executing single-partition query on cf_300000_keys_50_cols.color | 20:31:27,276 | 10.196.1.106 |          46171
>                                                       Acquiring sstable references | 20:31:27,276 | 10.196.1.106 |          46235
>                                                        Merging memtable tombstones | 20:31:27,276 | 10.196.1.106 |          46325
>                                                        Key cache hit for sstable 3 | 20:31:27,276 | 10.196.1.106 |          46501
>                                  Seeking to partition indexed section in data file | 20:31:27,276 | 10.196.1.106 |          46561
>                                                        Key cache hit for sstable 1 | 20:31:27,277 | 10.196.1.106 |          46652
>                                  Seeking to partition indexed section in data file | 20:31:27,277 | 10.196.1.106 |          46853
>                                         Merging data from memtables and 2 sstables | 20:31:27,277 | 10.196.1.106 |          46922
>                                                 Read 3 live and 0 tombstoned cells | 20:31:27,286 | 10.196.1.106 |          56025
>                         Executing single-partition query on cf_300000_keys_50_cols | 20:31:27,286 | 10.196.1.106 |          56198
>                                                       Acquiring sstable references | 20:31:27,286 | 10.196.1.106 |          56264
>                                                        Merging memtable tombstones | 20:31:27,286 | 10.196.1.106 |          56352
>                                             Bloom filter allows skipping sstable 3 | 20:31:27,286 | 10.196.1.106 |          56439
>                                             Bloom filter allows skipping sstable 2 | 20:31:27,286 | 10.196.1.106 |          56543
>                                                        Key cache hit for sstable 1 | 20:31:27,287 | 10.196.1.106 |          56631
>                                        Seeking to partition beginning in data file | 20:31:27,287 | 10.196.1.106 |          56634
>                                         Merging data from memtables and 1 sstables | 20:31:27,287 | 10.196.1.106 |          57194
>                                                 Read 1 live and 0 tombstoned cells | 20:31:27,287 | 10.196.1.106 |          57494
>                   Executing single-partition query on cf_300000_keys_50_cols.color | 20:31:27,288 | 10.196.1.106 |          57672
>                                                       Acquiring sstable references | 20:31:27,288 | 10.196.1.106 |          57736
>                                                        Merging memtable tombstones | 20:31:27,288 | 10.196.1.106 |          57922
>                                                        Key cache hit for sstable 3 | 20:31:27,288 | 10.196.1.106 |          58047
>                                  Seeking to partition indexed section in data file | 20:31:27,288 | 10.196.1.106 |          58200
>                                                        Key cache hit for sstable 1 | 20:31:27,288 | 10.196.1.106 |          58351
>                                  Seeking to partition indexed section in data file | 20:31:27,289 | 10.196.1.106 |          58783
>                                         Merging data from memtables and 2 sstables | 20:31:27,289 | 10.196.1.106 |          58790
>                                                 Read 3 live and 0 tombstoned cells | 20:31:27,299 | 10.196.1.106 |          69455
>                         Executing single-partition query on cf_300000_keys_50_cols | 20:31:27,300 | 10.196.1.106 |          69641
>                                                       Acquiring sstable references | 20:31:27,300 | 10.196.1.106 |          69707
>                                                        Merging memtable tombstones | 20:31:27,300 | 10.196.1.106 |          69713
>                                             Bloom filter allows skipping sstable 3 | 20:31:27,300 | 10.196.1.106 |          69806
>                                             Bloom filter allows skipping sstable 2 | 20:31:27,300 | 10.196.1.106 |          69904
>                                                        Key cache hit for sstable 1 | 20:31:27,300 | 10.196.1.106 |          69994
>                                        Seeking to partition beginning in data file | 20:31:27,300 | 10.196.1.106 |          70297
>                                         Merging data from memtables and 1 sstables | 20:31:27,301 | 10.196.1.106 |          70778
>                                                 Read 1 live and 0 tombstoned cells | 20:31:27,301 | 10.196.1.106 |          71044
>                   Executing single-partition query on cf_300000_keys_50_cols.color | 20:31:27,301 | 10.196.1.106 |          71271
>                                                       Acquiring sstable references | 20:31:27,301 | 10.196.1.106 |          71335
>                                                        Merging memtable tombstones | 20:31:27,301 | 10.196.1.106 |          71424
>                                                        Key cache hit for sstable 3 | 20:31:27,301 | 10.196.1.106 |          71583
>                                  Seeking to partition indexed section in data file | 20:31:27,302 | 10.196.1.106 |          71645
>                                                        Key cache hit for sstable 1 | 20:31:27,302 | 10.196.1.106 |          71882
>                                  Seeking to partition indexed section in data file | 20:31:27,302 | 10.196.1.106 |          71940
>                                         Merging data from memtables and 2 sstables | 20:31:27,302 | 10.196.1.106 |          72030
>                                                 Read 3 live and 0 tombstoned cells | 20:31:27,311 | 10.196.1.106 |          81217
>                         Executing single-partition query on cf_300000_keys_50_cols | 20:31:27,311 | 10.196.1.106 |          81369
>                                                       Acquiring sstable references | 20:31:27,311 | 10.196.1.106 |          81515
>                                                        Merging memtable tombstones | 20:31:27,312 | 10.196.1.106 |          81661
>                                                        Key cache hit for sstable 3 | 20:31:27,312 | 10.196.1.106 |          81812
>                                        Seeking to partition beginning in data file | 20:31:27,312 | 10.196.1.106 |          81873
>                                             Bloom filter allows skipping sstable 2 | 20:31:27,312 | 10.196.1.106 |          82409
>                                             Bloom filter allows skipping sstable 1 | 20:31:27,312 | 10.196.1.106 |          82479
>                                         Merging data from memtables and 1 sstables | 20:31:27,312 | 10.196.1.106 |          82481
>                                                 Read 1 live and 0 tombstoned cells | 20:31:27,313 | 10.196.1.106 |          82860
>                   Executing single-partition query on cf_300000_keys_50_cols.color | 20:31:27,313 | 10.196.1.106 |          83035
>                                                       Acquiring sstable references | 20:31:27,313 | 10.196.1.106 |          83099
>                                                        Merging memtable tombstones | 20:31:27,313 | 10.196.1.106 |          83217
>                                                        Key cache hit for sstable 3 | 20:31:27,313 | 10.196.1.106 |          83307
>                                  Seeking to partition indexed section in data file | 20:31:27,313 | 10.196.1.106 |          83410
>                                                        Key cache hit for sstable 1 | 20:31:27,314 | 10.196.1.106 |          83588
>                                  Seeking to partition indexed section in data file | 20:31:27,314 | 10.196.1.106 |          83652
>                                         Merging data from memtables and 2 sstables | 20:31:27,314 | 10.196.1.106 |          83742
>                                                 Read 3 live and 0 tombstoned cells | 20:31:27,338 | 10.196.1.106 |         108372
>                         Executing single-partition query on cf_300000_keys_50_cols | 20:31:27,345 | 10.196.1.106 |         115180
>                                                       Acquiring sstable references | 20:31:27,345 | 10.196.1.106 |         115183
>                                                        Merging memtable tombstones | 20:31:27,345 | 10.196.1.106 |         115188
>                                             Bloom filter allows skipping sstable 3 | 20:31:27,345 | 10.196.1.106 |         115194
>                                             Bloom filter allows skipping sstable 2 | 20:31:27,345 | 10.196.1.106 |         115197
>                                                        Key cache hit for sstable 1 | 20:31:27,345 | 10.196.1.106 |         115203
>                                        Seeking to partition beginning in data file | 20:31:27,345 | 10.196.1.106 |         115205
>                                         Merging data from memtables and 1 sstables | 20:31:27,347 | 10.196.1.106 |         116821
>                                                 Read 1 live and 0 tombstoned cells | 20:31:27,348 | 10.196.1.106 |         117631
>                   Executing single-partition query on cf_300000_keys_50_cols.color | 20:31:27,348 | 10.196.1.106 |         117997
>                                                       Acquiring sstable references | 20:31:27,348 | 10.196.1.106 |         118000
>                                                        Merging memtable tombstones | 20:31:27,348 | 10.196.1.106 |         118007
>                                                        Key cache hit for sstable 3 | 20:31:27,348 | 10.196.1.106 |         118014
>                                  Seeking to partition indexed section in data file | 20:31:27,348 | 10.196.1.106 |         118017
>                                                        Key cache hit for sstable 1 | 20:31:27,348 | 10.196.1.106 |         118023
>                                  Seeking to partition indexed section in data file | 20:31:27,348 | 10.196.1.106 |         118025
>                                         Merging data from memtables and 2 sstables | 20:31:27,348 | 10.196.1.106 |         118030
>                                                 Read 3 live and 0 tombstoned cells | 20:31:27,356 | 10.196.1.106 |         126375
>                         Executing single-partition query on cf_300000_keys_50_cols | 20:31:27,356 | 10.196.1.106 |         126418
>                                                       Acquiring sstable references | 20:31:27,356 | 10.196.1.106 |         126421
>                                                        Merging memtable tombstones | 20:31:27,356 | 10.196.1.106 |         126427
>                                             Bloom filter allows skipping sstable 3 | 20:31:27,357 | 10.196.1.106 |         126695
>                                             Bloom filter allows skipping sstable 2 | 20:31:27,357 | 10.196.1.106 |         126699
>                                                        Key cache hit for sstable 1 | 20:31:27,357 | 10.196.1.106 |         126705
>                                        Seeking to partition beginning in data file | 20:31:27,357 | 10.196.1.106 |         126708
>                                         Merging data from memtables and 1 sstables | 20:31:27,357 | 10.196.1.106 |         127265
>                                                 Read 1 live and 0 tombstoned cells | 20:31:27,357 | 10.196.1.106 |         127519
>                   Executing single-partition query on cf_300000_keys_50_cols.color | 20:31:27,358 | 10.196.1.106 |         127686
>                                                       Acquiring sstable references | 20:31:27,358 | 10.196.1.106 |         127694
>                                                        Merging memtable tombstones | 20:31:27,358 | 10.196.1.106 |         127700
>                                                        Key cache hit for sstable 3 | 20:31:27,358 | 10.196.1.106 |         127708
>                                  Seeking to partition indexed section in data file | 20:31:27,358 | 10.196.1.106 |         127710
>                                                        Key cache hit for sstable 1 | 20:31:27,358 | 10.196.1.106 |         127716
>                                  Seeking to partition indexed section in data file | 20:31:27,358 | 10.196.1.106 |         127718
>                                         Merging data from memtables and 2 sstables | 20:31:27,358 | 10.196.1.106 |         127722
>                                                 Read 3 live and 0 tombstoned cells | 20:31:27,366 | 10.196.1.106 |         135976
>                         Executing single-partition query on cf_300000_keys_50_cols | 20:31:27,366 | 10.196.1.106 |         136018
>                                                       Acquiring sstable references | 20:31:27,366 | 10.196.1.106 |         136020
>                                                        Merging memtable tombstones | 20:31:27,366 | 10.196.1.106 |         136026
>                                             Bloom filter allows skipping sstable 3 | 20:31:27,366 | 10.196.1.106 |         136032
>                                             Bloom filter allows skipping sstable 2 | 20:31:27,366 | 10.196.1.106 |         136035
>                                                        Key cache hit for sstable 1 | 20:31:27,366 | 10.196.1.106 |         136040
>                                        Seeking to partition beginning in data file | 20:31:27,366 | 10.196.1.106 |         136043
>                                         Merging data from memtables and 1 sstables | 20:31:27,367 | 10.196.1.106 |         136852
>                                                 Read 1 live and 0 tombstoned cells | 20:31:27,367 | 10.196.1.106 |         137046
>                   Executing single-partition query on cf_300000_keys_50_cols.color | 20:31:27,367 | 10.196.1.106 |         137154
>                                                       Acquiring sstable references | 20:31:27,367 | 10.196.1.106 |         137159
>                                                        Merging memtable tombstones | 20:31:27,367 | 10.196.1.106 |         137165
>                                                        Key cache hit for sstable 3 | 20:31:27,367 | 10.196.1.106 |         137172
>                                  Seeking to partition indexed section in data file | 20:31:27,367 | 10.196.1.106 |         137175
>                                                        Key cache hit for sstable 1 | 20:31:27,367 | 10.196.1.106 |         137181
>                                  Seeking to partition indexed section in data file | 20:31:27,367 | 10.196.1.106 |         137183
>                                         Merging data from memtables and 2 sstables | 20:31:27,367 | 10.196.1.106 |         137187
>                                                 Read 3 live and 0 tombstoned cells | 20:31:27,375 | 10.196.1.106 |         145161
>                         Executing single-partition query on cf_300000_keys_50_cols | 20:31:27,375 | 10.196.1.106 |         145195
>                                                       Acquiring sstable references | 20:31:27,375 | 10.196.1.106 |         145198
>                                                        Merging memtable tombstones | 20:31:27,375 | 10.196.1.106 |         145203
>                                                        Key cache hit for sstable 3 | 20:31:27,375 | 10.196.1.106 |         145212
>                                        Seeking to partition beginning in data file | 20:31:27,375 | 10.196.1.106 |         145214
>                                             Bloom filter allows skipping sstable 2 | 20:31:27,376 | 10.196.1.106 |         146059
>                                             Bloom filter allows skipping sstable 1 | 20:31:27,376 | 10.196.1.106 |         146063
>                                         Merging data from memtables and 1 sstables | 20:31:27,376 | 10.196.1.106 |         146066
>                                                 Read 1 live and 0 tombstoned cells | 20:31:27,376 | 10.196.1.106 |         146295
>                   Executing single-partition query on cf_300000_keys_50_cols.color | 20:31:27,376 | 10.196.1.106 |         146416
>                                                       Acquiring sstable references | 20:31:27,376 | 10.196.1.106 |         146419
>                                                        Merging memtable tombstones | 20:31:27,376 | 10.196.1.106 |         146425
>                                                        Key cache hit for sstable 3 | 20:31:27,376 | 10.196.1.106 |         146433
>                                  Seeking to partition indexed section in data file | 20:31:27,376 | 10.196.1.106 |         146435
>                                                        Key cache hit for sstable 1 | 20:31:27,376 | 10.196.1.106 |         146441
>                                  Seeking to partition indexed section in data file | 20:31:27,376 | 10.196.1.106 |         146443
>                                         Merging data from memtables and 2 sstables | 20:31:27,376 | 10.196.1.106 |         146447
>                                                 Read 3 live and 0 tombstoned cells | 20:31:27,384 | 10.196.1.106 |         153664
>                         Executing single-partition query on cf_300000_keys_50_cols | 20:31:27,384 | 10.196.1.106 |         153708
>                                                       Acquiring sstable references | 20:31:27,384 | 10.196.1.106 |         153711
>                                                        Merging memtable tombstones | 20:31:27,384 | 10.196.1.106 |         153717
>                                                        Key cache hit for sstable 3 | 20:31:27,384 | 10.196.1.106 |         153899
>                                        Seeking to partition beginning in data file | 20:31:27,384 | 10.196.1.106 |         153902
>                                             Bloom filter allows skipping sstable 2 | 20:31:27,384 | 10.196.1.106 |         154556
>                                             Bloom filter allows skipping sstable 1 | 20:31:27,384 | 10.196.1.106 |         154566
>                                         Merging data from memtables and 1 sstables | 20:31:27,384 | 10.196.1.106 |         154568
>                                                 Read 1 live and 0 tombstoned cells | 20:31:27,385 | 10.196.1.106 |         155041
>                   Executing single-partition query on cf_300000_keys_50_cols.color | 20:31:27,385 | 10.196.1.106 |         155112
>                                                       Acquiring sstable references | 20:31:27,385 | 10.196.1.106 |         155156
>                                                        Merging memtable tombstones | 20:31:27,385 | 10.196.1.106 |         155163
>                                                        Key cache hit for sstable 3 | 20:31:27,385 | 10.196.1.106 |         155171
>                                  Seeking to partition indexed section in data file | 20:31:27,385 | 10.196.1.106 |         155173
>                                                        Key cache hit for sstable 1 | 20:31:27,385 | 10.196.1.106 |         155179
>                                  Seeking to partition indexed section in data file | 20:31:27,385 | 10.196.1.106 |         155181
>                                         Merging data from memtables and 2 sstables | 20:31:27,385 | 10.196.1.106 |         155185
>                                                 Read 3 live and 0 tombstoned cells | 20:31:27,393 | 10.196.1.106 |         163321
>                         Executing single-partition query on cf_300000_keys_50_cols | 20:31:27,393 | 10.196.1.106 |         163365
>                                                       Acquiring sstable references | 20:31:27,393 | 10.196.1.106 |         163367
>                                                        Merging memtable tombstones | 20:31:27,393 | 10.196.1.106 |         163373
>                                             Bloom filter allows skipping sstable 3 | 20:31:27,393 | 10.196.1.106 |         163379
>                                             Bloom filter allows skipping sstable 2 | 20:31:27,393 | 10.196.1.106 |         163382
>                                                        Key cache hit for sstable 1 | 20:31:27,393 | 10.196.1.106 |         163387
>                                        Seeking to partition beginning in data file | 20:31:27,393 | 10.196.1.106 |         163389
>                                         Merging data from memtables and 1 sstables | 20:31:27,394 | 10.196.1.106 |         164206
>                                                 Read 1 live and 0 tombstoned cells | 20:31:27,394 | 10.196.1.106 |         164397
>                   Executing single-partition query on cf_300000_keys_50_cols.color | 20:31:27,394 | 10.196.1.106 |         164562
>                                                       Acquiring sstable references | 20:31:27,394 | 10.196.1.106 |         164570
>                                                        Merging memtable tombstones | 20:31:27,394 | 10.196.1.106 |         164576
>                                                        Key cache hit for sstable 3 | 20:31:27,394 | 10.196.1.106 |         164584
>                                  Seeking to partition indexed section in data file | 20:31:27,394 | 10.196.1.106 |         164587
>                                                        Key cache hit for sstable 1 | 20:31:27,395 | 10.196.1.106 |         164593
>                                  Seeking to partition indexed section in data file | 20:31:27,395 | 10.196.1.106 |         164595
>                                         Merging data from memtables and 2 sstables | 20:31:27,395 | 10.196.1.106 |         164599
>                                                 Read 3 live and 0 tombstoned cells | 20:31:27,403 | 10.196.1.106 |         172818
>                         Executing single-partition query on cf_300000_keys_50_cols | 20:31:27,403 | 10.196.1.106 |         172860
>                                                       Acquiring sstable references | 20:31:27,403 | 10.196.1.106 |         172862
>                                                        Merging memtable tombstones | 20:31:27,403 | 10.196.1.106 |         172868
>                                             Bloom filter allows skipping sstable 3 | 20:31:27,403 | 10.196.1.106 |         172967
>                                             Bloom filter allows skipping sstable 2 | 20:31:27,403 | 10.196.1.106 |         172971
>                                                        Key cache hit for sstable 1 | 20:31:27,403 | 10.196.1.106 |         172979
>                                        Seeking to partition beginning in data file | 20:31:27,403 | 10.196.1.106 |         172982
>                                         Merging data from memtables and 1 sstables | 20:31:27,404 | 10.196.1.106 |         173735
>                                                 Read 1 live and 0 tombstoned cells | 20:31:27,404 | 10.196.1.106 |         173923
>                   Executing single-partition query on cf_300000_keys_50_cols.color | 20:31:27,404 | 10.196.1.106 |         174088
>                                                       Acquiring sstable references | 20:31:27,404 | 10.196.1.106 |         174096
>                                                        Merging memtable tombstones | 20:31:27,404 | 10.196.1.106 |         174102
>                                                        Key cache hit for sstable 3 | 20:31:27,404 | 10.196.1.106 |         174110
>                                  Seeking to partition indexed section in data file | 20:31:27,404 | 10.196.1.106 |         174112
>                                                        Key cache hit for sstable 1 | 20:31:27,404 | 10.196.1.106 |         174119
>                                  Seeking to partition indexed section in data file | 20:31:27,404 | 10.196.1.106 |         174121
>                                         Merging data from memtables and 2 sstables | 20:31:27,404 | 10.196.1.106 |         174124
>                                                 Read 3 live and 0 tombstoned cells | 20:31:27,414 | 10.196.1.106 |         183917
>                         Executing single-partition query on cf_300000_keys_50_cols | 20:31:27,414 | 10.196.1.106 |         183959
>                                                       Acquiring sstable references | 20:31:27,414 | 10.196.1.106 |         183961
>                                                        Merging memtable tombstones | 20:31:27,414 | 10.196.1.106 |         183967
>                                             Bloom filter allows skipping sstable 3 | 20:31:27,414 | 10.196.1.106 |         183973
>                                             Bloom filter allows skipping sstable 2 | 20:31:27,414 | 10.196.1.106 |         183976
>                                                        Key cache hit for sstable 1 | 20:31:27,414 | 10.196.1.106 |         183982
>                                        Seeking to partition beginning in data file | 20:31:27,414 | 10.196.1.106 |         183984
>                                         Merging data from memtables and 1 sstables | 20:31:27,415 | 10.196.1.106 |         184807
>                                                 Read 1 live and 0 tombstoned cells | 20:31:27,415 | 10.196.1.106 |         184994
>                   Executing single-partition query on cf_300000_keys_50_cols.color | 20:31:27,415 | 10.196.1.106 |         185105
>                                                       Acquiring sstable references | 20:31:27,415 | 10.196.1.106 |         185108
>                                                        Merging memtable tombstones | 20:31:27,415 | 10.196.1.106 |         185114
>                                                        Key cache hit for sstable 3 | 20:31:27,415 | 10.196.1.106 |         185134
>                                  Seeking to partition indexed section in data file | 20:31:27,415 | 10.196.1.106 |         185136
>                                                        Key cache hit for sstable 1 | 20:31:27,415 | 10.196.1.106 |         185142
>                                  Seeking to partition indexed section in data file | 20:31:27,415 | 10.196.1.106 |         185144
>                                         Merging data from memtables and 2 sstables | 20:31:27,415 | 10.196.1.106 |         185148
>                                                 Read 3 live and 0 tombstoned cells | 20:31:27,423 | 10.196.1.106 |         193586
>                         Executing single-partition query on cf_300000_keys_50_cols | 20:31:27,424 | 10.196.1.106 |         193635
>                                                       Acquiring sstable references | 20:31:27,424 | 10.196.1.106 |         193638
>                                                        Merging memtable tombstones | 20:31:27,424 | 10.196.1.106 |         193643
>                                             Bloom filter allows skipping sstable 3 | 20:31:27,424 | 10.196.1.106 |         193649
>                                             Bloom filter allows skipping sstable 2 | 20:31:27,424 | 10.196.1.106 |         193652
>                                                        Key cache hit for sstable 1 | 20:31:27,424 | 10.196.1.106 |         193657
>                                        Seeking to partition beginning in data file | 20:31:27,424 | 10.196.1.106 |         193660
>                                         Merging data from memtables and 1 sstables | 20:31:27,424 | 10.196.1.106 |         194274
>                                                 Read 1 live and 0 tombstoned cells | 20:31:27,424 | 10.196.1.106 |         194483
>                   Executing single-partition query on cf_300000_keys_50_cols.color | 20:31:27,425 | 10.196.1.106 |         194597
>                                                       Acquiring sstable references | 20:31:27,425 | 10.196.1.106 |         194605
>                                                        Merging memtable tombstones | 20:31:27,425 | 10.196.1.106 |         194611
>                                                        Key cache hit for sstable 3 | 20:31:27,425 | 10.196.1.106 |         194619
>                                  Seeking to partition indexed section in data file | 20:31:27,425 | 10.196.1.106 |         194621
>                                                        Key cache hit for sstable 1 | 20:31:27,425 | 10.196.1.106 |         194627
>                                  Seeking to partition indexed section in data file | 20:31:27,425 | 10.196.1.106 |         194629
>                                         Merging data from memtables and 2 sstables | 20:31:27,425 | 10.196.1.106 |         194633
>                                                 Read 3 live and 0 tombstoned cells | 20:31:27,433 | 10.196.1.106 |         203042
>                         Executing single-partition query on cf_300000_keys_50_cols | 20:31:27,433 | 10.196.1.106 |         203084
>                                                       Acquiring sstable references | 20:31:27,433 | 10.196.1.106 |         203086
>                                                        Merging memtable tombstones | 20:31:27,433 | 10.196.1.106 |         203092
>                                             Bloom filter allows skipping sstable 3 | 20:31:27,433 | 10.196.1.106 |         203097
>                                             Bloom filter allows skipping sstable 2 | 20:31:27,433 | 10.196.1.106 |         203100
>                                                        Key cache hit for sstable 1 | 20:31:27,433 | 10.196.1.106 |         203106
>                                        Seeking to partition beginning in data file | 20:31:27,433 | 10.196.1.106 |         203108
>                                         Merging data from memtables and 1 sstables | 20:31:27,434 | 10.196.1.106 |         203598
>                                                 Read 1 live and 0 tombstoned cells | 20:31:27,434 | 10.196.1.106 |         203942
>                   Executing single-partition query on cf_300000_keys_50_cols.color | 20:31:27,434 | 10.196.1.106 |         204112
>                                                       Acquiring sstable references | 20:31:27,434 | 10.196.1.106 |         204120
>                                                        Merging memtable tombstones | 20:31:27,434 | 10.196.1.106 |         204126
>                                                        Key cache hit for sstable 3 | 20:31:27,434 | 10.196.1.106 |         204134
>                                  Seeking to partition indexed section in data file | 20:31:27,434 | 10.196.1.106 |         204136
>                                                        Key cache hit for sstable 1 | 20:31:27,434 | 10.196.1.106 |         204142
>                                  Seeking to partition indexed section in data file | 20:31:27,434 | 10.196.1.106 |         204144
>                                         Merging data from memtables and 2 sstables | 20:31:27,434 | 10.196.1.106 |         204148
>                                                 Read 3 live and 0 tombstoned cells | 20:31:27,441 | 10.196.1.106 |         211397
>                         Executing single-partition query on cf_300000_keys_50_cols | 20:31:27,441 | 10.196.1.106 |         211439
>                                                       Acquiring sstable references | 20:31:27,441 | 10.196.1.106 |         211441
>                                                        Merging memtable tombstones | 20:31:27,441 | 10.196.1.106 |         211447
>                                             Bloom filter allows skipping sstable 3 | 20:31:27,442 | 10.196.1.106 |         211546
>                                             Bloom filter allows skipping sstable 2 | 20:31:27,442 | 10.196.1.106 |         211732
>                                                        Key cache hit for sstable 1 | 20:31:27,442 | 10.196.1.106 |         211737
>                                        Seeking to partition beginning in data file | 20:31:27,442 | 10.196.1.106 |         211739
>                                         Merging data from memtables and 1 sstables | 20:31:27,442 | 10.196.1.106 |         212484
>                                                 Read 1 live and 0 tombstoned cells | 20:31:27,443 | 10.196.1.106 |         212809
>                   Executing single-partition query on cf_300000_keys_50_cols.color | 20:31:27,443 | 10.196.1.106 |         212918
>                                                       Acquiring sstable references | 20:31:27,443 | 10.196.1.106 |         212921
>                                                        Merging memtable tombstones | 20:31:27,443 | 10.196.1.106 |         212927
>                                                        Key cache hit for sstable 3 | 20:31:27,443 | 10.196.1.106 |         212934
>                                  Seeking to partition indexed section in data file | 20:31:27,443 | 10.196.1.106 |         212936
>                                                        Key cache hit for sstable 1 | 20:31:27,443 | 10.196.1.106 |         212943
>                                  Seeking to partition indexed section in data file | 20:31:27,443 | 10.196.1.106 |         212945
>                                         Merging data from memtables and 2 sstables | 20:31:27,443 | 10.196.1.106 |         212949
>                                                 Read 3 live and 0 tombstoned cells | 20:31:27,451 | 10.196.1.106 |         220911
>                         Executing single-partition query on cf_300000_keys_50_cols | 20:31:27,451 | 10.196.1.106 |         220954
>                                                       Acquiring sstable references | 20:31:27,451 | 10.196.1.106 |         220956
>                                                        Merging memtable tombstones | 20:31:27,451 | 10.196.1.106 |         220962
>                                             Bloom filter allows skipping sstable 3 | 20:31:27,451 | 10.196.1.106 |         220968
>                                             Bloom filter allows skipping sstable 2 | 20:31:27,451 | 10.196.1.106 |         220971
>                                                        Key cache hit for sstable 1 | 20:31:27,451 | 10.196.1.106 |         220976
>                                        Seeking to partition beginning in data file | 20:31:27,451 | 10.196.1.106 |         220979
>                                         Merging data from memtables and 1 sstables | 20:31:27,452 | 10.196.1.106 |         221774
>                                                 Read 1 live and 0 tombstoned cells | 20:31:27,452 | 10.196.1.106 |         221965
>                   Executing single-partition query on cf_300000_keys_50_cols.color | 20:31:27,452 | 10.196.1.106 |         222093
>                                                       Acquiring sstable references | 20:31:27,452 | 10.196.1.106 |         222101
>                                                        Merging memtable tombstones | 20:31:27,452 | 10.196.1.106 |         222108
>                                                        Key cache hit for sstable 3 | 20:31:27,452 | 10.196.1.106 |         222115
>                                  Seeking to partition indexed section in data file | 20:31:27,452 | 10.196.1.106 |         222118
>                                                        Key cache hit for sstable 1 | 20:31:27,452 | 10.196.1.106 |         222124
>                                  Seeking to partition indexed section in data file | 20:31:27,452 | 10.196.1.106 |         222126
>                                         Merging data from memtables and 2 sstables | 20:31:27,452 | 10.196.1.106 |         222130
>                                                 Read 3 live and 0 tombstoned cells | 20:31:27,460 | 10.196.1.106 |         230378
>                         Executing single-partition query on cf_300000_keys_50_cols | 20:31:27,460 | 10.196.1.106 |         230420
>                                                       Acquiring sstable references | 20:31:27,460 | 10.196.1.106 |         230422
>                                                        Merging memtable tombstones | 20:31:27,460 | 10.196.1.106 |         230428
>                                             Bloom filter allows skipping sstable 3 | 20:31:27,461 | 10.196.1.106 |         230527
>                                             Bloom filter allows skipping sstable 2 | 20:31:27,461 | 10.196.1.106 |         230619
>                                                        Key cache hit for sstable 1 | 20:31:27,461 | 10.196.1.106 |         230624
>                                        Seeking to partition beginning in data file | 20:31:27,461 | 10.196.1.106 |         230627
>                                         Merging data from memtables and 1 sstables | 20:31:27,461 | 10.196.1.106 |         231223
>                                                 Read 1 live and 0 tombstoned cells | 20:31:27,461 | 10.196.1.106 |         231419
>                   Executing single-partition query on cf_300000_keys_50_cols.color | 20:31:27,461 | 10.196.1.106 |         231531
>                                                       Acquiring sstable references | 20:31:27,461 | 10.196.1.106 |         231540
>                                                        Merging memtable tombstones | 20:31:27,461 | 10.196.1.106 |         231545
>                                                        Key cache hit for sstable 3 | 20:31:27,461 | 10.196.1.106 |         231553
>                                  Seeking to partition indexed section in data file | 20:31:27,461 | 10.196.1.106 |         231555
>                                                        Key cache hit for sstable 1 | 20:31:27,461 | 10.196.1.106 |         231562
>                                  Seeking to partition indexed section in data file | 20:31:27,461 | 10.196.1.106 |         231564
>                                         Merging data from memtables and 2 sstables | 20:31:27,461 | 10.196.1.106 |         231568
>                                                 Read 3 live and 0 tombstoned cells | 20:31:27,470 | 10.196.1.106 |         239976
>                         Executing single-partition query on cf_300000_keys_50_cols | 20:31:27,470 | 10.196.1.106 |         240020
>                                                       Acquiring sstable references | 20:31:27,470 | 10.196.1.106 |         240022
>                                                        Merging memtable tombstones | 20:31:27,470 | 10.196.1.106 |         240028
>                                             Bloom filter allows skipping sstable 3 | 20:31:27,470 | 10.196.1.106 |         240034
>                                             Bloom filter allows skipping sstable 2 | 20:31:27,470 | 10.196.1.106 |         240037
>                                                        Key cache hit for sstable 1 | 20:31:27,470 | 10.196.1.106 |         240054
>                                        Seeking to partition beginning in data file | 20:31:27,470 | 10.196.1.106 |         240093
>                                         Merging data from memtables and 1 sstables | 20:31:27,470 | 10.196.1.106 |         240585
>                                                 Read 1 live and 0 tombstoned cells | 20:31:27,471 | 10.196.1.106 |         240885
>                   Executing single-partition query on cf_300000_keys_50_cols.color | 20:31:27,471 | 10.196.1.106 |         240993
>                                                       Acquiring sstable references | 20:31:27,471 | 10.196.1.106 |         240997
>                                                        Merging memtable tombstones | 20:31:27,471 | 10.196.1.106 |         241003
>                                                        Key cache hit for sstable 3 | 20:31:27,471 | 10.196.1.106 |         241011
>                                  Seeking to partition indexed section in data file | 20:31:27,471 | 10.196.1.106 |         241013
>                                                        Key cache hit for sstable 1 | 20:31:27,471 | 10.196.1.106 |         241019
>                                  Seeking to partition indexed section in data file | 20:31:27,471 | 10.196.1.106 |         241020
>                                         Merging data from memtables and 2 sstables | 20:31:27,471 | 10.196.1.106 |         241028
>                                                 Read 3 live and 0 tombstoned cells | 20:31:27,479 | 10.196.1.106 |         249225
>                         Executing single-partition query on cf_300000_keys_50_cols | 20:31:27,479 | 10.196.1.106 |         249265
>                                                       Acquiring sstable references | 20:31:27,479 | 10.196.1.106 |         249267
>                                                        Merging memtable tombstones | 20:31:27,479 | 10.196.1.106 |         249273
>                                             Bloom filter allows skipping sstable 3 | 20:31:27,479 | 10.196.1.106 |         249279
>                                             Bloom filter allows skipping sstable 2 | 20:31:27,479 | 10.196.1.106 |         249282
>                                                        Key cache hit for sstable 1 | 20:31:27,479 | 10.196.1.106 |         249287
>                                        Seeking to partition beginning in data file | 20:31:27,479 | 10.196.1.106 |         249289
>                                         Merging data from memtables and 1 sstables | 20:31:27,479 | 10.196.1.106 |         249296
>                                                 Read 1 live and 0 tombstoned cells | 20:31:27,479 | 10.196.1.106 |         249558
>                   Executing single-partition query on cf_300000_keys_50_cols.color | 20:31:27,480 | 10.196.1.106 |         249655
>                                                       Acquiring sstable references | 20:31:27,480 | 10.196.1.106 |         249658
>                                                        Merging memtable tombstones | 20:31:27,480 | 10.196.1.106 |         249755
>                                                        Key cache hit for sstable 3 | 20:31:27,480 | 10.196.1.106 |         249763
>                                  Seeking to partition indexed section in data file | 20:31:27,480 | 10.196.1.106 |         249765
>                                                        Key cache hit for sstable 1 | 20:31:27,480 | 10.196.1.106 |         249772
>                                  Seeking to partition indexed section in data file | 20:31:27,480 | 10.196.1.106 |         249774
>                                         Merging data from memtables and 2 sstables | 20:31:27,480 | 10.196.1.106 |         249778
>                                                 Read 3 live and 0 tombstoned cells | 20:31:27,487 | 10.196.1.106 |         257542
>                         Executing single-partition query on cf_300000_keys_50_cols | 20:31:27,487 | 10.196.1.106 |         257575
>                                                       Acquiring sstable references | 20:31:27,488 | 10.196.1.106 |         257610
>                                                        Merging memtable tombstones | 20:31:27,488 | 10.196.1.106 |         257616
>                                             Bloom filter allows skipping sstable 3 | 20:31:27,488 | 10.196.1.106 |         257622
>                                             Bloom filter allows skipping sstable 2 | 20:31:27,488 | 10.196.1.106 |         257625
>                                                        Key cache hit for sstable 1 | 20:31:27,488 | 10.196.1.106 |         257631
>                                        Seeking to partition beginning in data file | 20:31:27,488 | 10.196.1.106 |         257633
>                                         Merging data from memtables and 1 sstables | 20:31:27,488 | 10.196.1.106 |         258473
>                                                 Read 1 live and 0 tombstoned cells | 20:31:27,489 | 10.196.1.106 |         259067
>                   Executing single-partition query on cf_300000_keys_50_cols.color | 20:31:27,489 | 10.196.1.106 |         259197
>                                                       Acquiring sstable references | 20:31:27,489 | 10.196.1.106 |         259200
>                                                        Merging memtable tombstones | 20:31:27,489 | 10.196.1.106 |         259206
>                                                        Key cache hit for sstable 3 | 20:31:27,489 | 10.196.1.106 |         259214
>                                  Seeking to partition indexed section in data file | 20:31:27,489 | 10.196.1.106 |         259216
>                                                        Key cache hit for sstable 1 | 20:31:27,489 | 10.196.1.106 |         259222
>                                  Seeking to partition indexed section in data file | 20:31:27,489 | 10.196.1.106 |         259224
>                                         Merging data from memtables and 2 sstables | 20:31:27,489 | 10.196.1.106 |         259319
>                                                 Read 3 live and 0 tombstoned cells | 20:31:27,497 | 10.196.1.106 |         267071
>                         Executing single-partition query on cf_300000_keys_50_cols | 20:31:27,497 | 10.196.1.106 |         267135
>                                                       Acquiring sstable references | 20:31:27,497 | 10.196.1.106 |         267137
>                                                        Merging memtable tombstones | 20:31:27,497 | 10.196.1.106 |         267143
>                                                        Key cache hit for sstable 3 | 20:31:27,497 | 10.196.1.106 |         267151
>                                        Seeking to partition beginning in data file | 20:31:27,497 | 10.196.1.106 |         267154
>                                             Bloom filter allows skipping sstable 2 | 20:31:27,498 | 10.196.1.106 |         267943
>                                             Bloom filter allows skipping sstable 1 | 20:31:27,498 | 10.196.1.106 |         267957
>                                         Merging data from memtables and 1 sstables | 20:31:27,498 | 10.196.1.106 |         267960
>                                                 Read 1 live and 0 tombstoned cells | 20:31:27,498 | 10.196.1.106 |         268176
>                   Executing single-partition query on cf_300000_keys_50_cols.color | 20:31:27,498 | 10.196.1.106 |         268271
>                                                       Acquiring sstable references | 20:31:27,498 | 10.196.1.106 |         268274
>                                                        Merging memtable tombstones | 20:31:27,498 | 10.196.1.106 |         268280
>                                                        Key cache hit for sstable 3 | 20:31:27,498 | 
> ...
> {code}

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