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https://issues.apache.org/jira/browse/CASSANDRA-11473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15229218#comment-15229218
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Tyler Hobbs commented on CASSANDRA-11473:
-----------------------------------------
It looks like the clustering value is not actually being zeroed out, it simply
only had data in the milliseconds portion of the timestamp, which cqlsh wasn't
showing by default. Instead, it's looking more like this is a ser/deser
problem related to a dropped column.
> Clustering column value is zeroed out in some query results
> -----------------------------------------------------------
>
> Key: CASSANDRA-11473
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11473
> Project: Cassandra
> Issue Type: Bug
> Environment: debian jessie patch current with Cassandra 3.0.4
> Reporter: Jason Kania
>
> As per a discussion on the mailing list,
> http://www.mail-archive.com/[email protected]/msg46902.html, we are
> encountering inconsistent query results when the following query is run:
> {noformat}
> select "subscriberId","sensorUnitId","sensorId","time" from
> "sensorReadingIndex" where "subscriberId"='JASKAN' AND "sensorUnitId"=0 AND
> "sensorId"=0 ORDER BY "time" LIMIT 10;
> {noformat}
> Invalid Query Results
> {noformat}
> subscriberId sensorUnitId sensorId time
> JASKAN 0 0 2015-05-24 2:09
> JASKAN 0 0 1969-12-31 19:00
> JASKAN 0 0 2016-01-21 2:10
> JASKAN 0 0 2016-01-21 2:10
> JASKAN 0 0 2016-01-21 2:10
> JASKAN 0 0 2016-01-21 2:11
> JASKAN 0 0 2016-01-21 2:22
> JASKAN 0 0 2016-01-21 2:22
> JASKAN 0 0 2016-01-21 2:22
> JASKAN 0 0 2016-01-21 2:22
> {noformat}
> Valid Query Results
> {noformat}
> subscriberId sensorUnitId sensorId time
> JASKAN 0 0 2015-05-24 2:09
> JASKAN 0 0 2015-05-24 2:09
> JASKAN 0 0 2015-05-24 2:10
> JASKAN 0 0 2015-05-24 2:10
> JASKAN 0 0 2015-05-24 2:10
> JASKAN 0 0 2015-05-24 2:10
> JASKAN 0 0 2015-05-24 2:11
> JASKAN 0 0 2015-05-24 2:13
> JASKAN 0 0 2015-05-24 2:13
> JASKAN 0 0 2015-05-24 2:14
> {noformat}
> Running the following yields no rows indicating that the 1969... timestamp is
> invalid.
> {noformat}
> select "subscriberId","sensorUnitId","sensorId","time" FROM
> "edgeTransitionIndex" where "subscriberId"='JASKAN' AND "sensorUnitId"=0 AND
> "sensorId"=0 and time='1969-12-31 19:00:00-0500';
> {noformat}
> The schema is as follows:
> {noformat}
> CREATE TABLE sensorReading."sensorReadingIndex" (
> "subscriberId" text,
> "sensorUnitId" int,
> "sensorId" int,
> time timestamp,
> "classId" int,
> correlation float,
> PRIMARY KEY (("subscriberId", "sensorUnitId", "sensorId"), time)
> ) WITH CLUSTERING ORDER BY (time 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';
> CREATE INDEX classSecondaryIndex ON sensorReading."sensorReadingIndex"
> ("classId");
> {noformat}
> We were asked to provide our sstables as well but these are very large and
> would require some data obfuscation. We are able to run code or scripts
> against the data on our servrers if that is option.
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