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https://issues.apache.org/jira/browse/CASSANDRA-4421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13650267#comment-13650267
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Alex Liu commented on CASSANDRA-4421:
-------------------------------------
It does a few extra CQL requests to get to the next page/CF rows. Other than
that it's efficient on thrift server.
Because that native paging could keep using the same connection and internally
keep reading the data where page it's, native auto paging could be a more
efficient.
I don't know how difficult to implement the native auto paging and the time
line. When it's available, we can add a new CQL native reader, so user can have
choice to use this one and the new native reader.
> Support cql3 table definitions in Hadoop InputFormat
> ----------------------------------------------------
>
> Key: CASSANDRA-4421
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4421
> Project: Cassandra
> Issue Type: Improvement
> Components: API
> Affects Versions: 1.1.0
> Environment: Debian Squeeze
> Reporter: bert Passek
> Labels: cql3
> Fix For: 1.2.5
>
>
> Hello,
> i faced a bug while writing composite column values and following validation
> on server side.
> This is the setup for reproduction:
> 1. create a keyspace
> create keyspace test with strategy_class = 'SimpleStrategy' and
> strategy_options:replication_factor = 1;
> 2. create a cf via cql (3.0)
> create table test1 (
> a int,
> b int,
> c int,
> primary key (a, b)
> );
> If i have a look at the schema in cli i noticed that there is no column
> metadata for columns not part of primary key.
> create column family test1
> with column_type = 'Standard'
> and comparator =
> 'CompositeType(org.apache.cassandra.db.marshal.Int32Type,org.apache.cassandra.db.marshal.UTF8Type)'
> and default_validation_class = 'UTF8Type'
> and key_validation_class = 'Int32Type'
> and read_repair_chance = 0.1
> and dclocal_read_repair_chance = 0.0
> and gc_grace = 864000
> and min_compaction_threshold = 4
> and max_compaction_threshold = 32
> and replicate_on_write = true
> and compaction_strategy =
> 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy'
> and caching = 'KEYS_ONLY'
> and compression_options = {'sstable_compression' :
> 'org.apache.cassandra.io.compress.SnappyCompressor'};
> Please notice the default validation class: UTF8Type
> Now i would like to insert value > 127 via cassandra client (no cql, part of
> mr-jobs). Have a look at the attachement.
> Batch mutate fails:
> InvalidRequestException(why:(String didn't validate.) [test][test1][1:c]
> failed validation)
> A validator for column value is fetched in
> ThriftValidation::validateColumnData which returns always the default
> validator which is UTF8Type as described above (The ColumnDefinition for
> given column name "c" is always null)
> In UTF8Type there is a check for
> if (b > 127)
> return false;
> Anyway, maybe i'm doing something wrong, but i used cql 3.0 for table
> creation. I assigned data types to all columns, but i can not set values for
> a composite column because the default validation class is used.
> I think the schema should know the correct validator even for composite
> columns. The usage of the default validation class does not make sense.
> Best Regards
> Bert Passek
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