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https://issues.apache.org/jira/browse/CASSANDRA-9540?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mathijs Vogelzang updated CASSANDRA-9540:
-----------------------------------------
Summary: Cql IN query wrong on rows with values bigger than 64kb (was: Cql
query doesn't return right information when using IN on columns for some keys)
> Cql IN query wrong on rows with values bigger than 64kb
> -------------------------------------------------------
>
> Key: CASSANDRA-9540
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9540
> Project: Cassandra
> Issue Type: Bug
> Components: API
> Environment: Cassandra 2.1.5
> Reporter: Mathijs Vogelzang
> Assignee: Carl Yeksigian
> Fix For: 2.1.x
>
>
> We are investigating a weird issue where one of our clients doesn't get data
> on his dashboard. It seems Cassandra is not returning data for a particular
> key ("brokenkey" from now on).
> Some background:
> We have a row where we store a "metadata" column and data in columns
> "bucket/0", "bucket/1", "bucket/2", etc. Depending on the date selection of
> the UI, we know that we only need to retrieve bucket/0, bucket/0 and bucket/1
> etc. (we always need to retrieve "metadata").
> A typical query may look like this (using SELECT column1 to just show what is
> returned, normally we would of course do SELECT value):
> {noformat}
> cqlsh:AppBrain> select blobAsText(column1) from "GroupedSeries" where
> key=textAsBlob('install/workingkey');
> blobAsText(column1)
> ---------------------
> bucket/0
> metadata
> (2 rows)
> cqlsh:AppBrain> select blobAsText(column1) from "GroupedSeries" where
> key=textAsBlob('install/brokenkey');
> blobAsText(column1)
> ---------------------
> bucket/0
> metadata
> (2 rows)
> {noformat}
> These two queries work as expected, and return the information that we
> actually stored.
> However, when we "filter" for certain columns, the brokenkey starts behaving
> very weird:
> {noformat}
> cqlsh:AppBrain> select blobAsText(column1) from "GroupedSeries" where
> key=textAsBlob('install/workingkey') and column1 IN
> (textAsBlob('metadata'),textAsBlob('bucket/0'),textAsBlob('bucket/1'),textAsBlob('bucket/2'));
> blobAsText(column1)
> ---------------------
> bucket/0
> metadata
> (2 rows)
> cqlsh:AppBrain> select blobAsText(column1) from "GroupedSeries" where
> key=textAsBlob('install/workingkey') and column1 IN
> (textAsBlob('metadata'),textAsBlob('bucket/0'),textAsBlob('bucket/1'),textAsBlob('bucket/2'),textAsBlob('asdfasdfasdf'));
> blobAsText(column1)
> ---------------------
> bucket/0
> metadata
> (2 rows)
> *** As expected, querying for more information doesn't really matter for the
> working key ***
> cqlsh:AppBrain> select blobAsText(column1) from "GroupedSeries" where
> key=textAsBlob('install/brokenkey') and column1 IN
> (textAsBlob('metadata'),textAsBlob('bucket/0'),textAsBlob('bucket/1'),textAsBlob('bucket/2'));
> blobAsText(column1)
> ---------------------
> bucket/0
> (1 rows)
> *** Cassandra stops giving us the metadata column when asking for a few more
> columns! ***
> cqlsh:AppBrain> select blobAsText(column1) from "GroupedSeries" where
> key=textAsBlob('install/brokenkey') and column1 IN
> (textAsBlob('metadata'),textAsBlob('bucket/0'),textAsBlob('bucket/1'),textAsBlob('bucket/2'),textAsBlob('asdfasdfasdf'));
> key | column1 | value
> -----+---------+-------
> (0 rows)
> *** Adding the bogus column name even makes it return nothing from this row
> anymore! ***
> {noformat}
> There are at least two rows that malfunction like this in our table (which is
> quite old already and has gone through a bunch of Cassandra upgrades). I've
> upgraded our whole cluster to 2.1.5 (we were on 2.1.2 when I discovered this
> problem) and compacted, repaired and scrubbed this column family, which
> hasn't helped.
> Our table structure is:
> {noformat}
> cqlsh:AppBrain> describe table "GroupedSeries";
> CREATE TABLE "AppBrain"."GroupedSeries" (
> key blob,
> column1 blob,
> value blob,
> PRIMARY KEY (key, column1)
> ) WITH COMPACT STORAGE
> AND CLUSTERING ORDER BY (column1 ASC)
> AND caching = '{"keys":"ALL", "rows_per_partition":"NONE"}'
> AND comment = ''
> AND compaction = {'min_threshold': '4', 'class':
> 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy',
> 'max_threshold': '32'}
> AND compression = {'sstable_compression':
> 'org.apache.cassandra.io.compress.LZ4Compressor'}
> 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 = 1.0
> AND speculative_retry = 'NONE';
> {noformat}
> Let me know if I can give more information that may be helpful.
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