On Tue, Mar 8, 2016 at 8:39 PM, Jean Carlo <jean.jeancar...@gmail.com>
wrote:
> Hi guys,
>
> I use cassandra stress to populate the next table
>
> CREATE TABLE cf1 (
> kvalue text,
> ktype text,
> prov text,
> dname text,
> dattrib blob,
> dvalue text,
> PRIMARY KEY (kvalue, ktype, prov, dname)
> ) WITH bloom_filter_fp_chance = 0.01
> AND caching = '{"keys":"ALL", "rows_per_partition":"60"}'
> AND comment = ''
> AND compaction = {'class':
> 'org.apache.cassandra.db.compaction.LeveledCompactionStrategy'}
> AND compression = {'sstable_compression':
> 'org.apache.cassandra.io.compress.SnappyCompressor'}
> AND dclocal_read_repair_chance = 0.02
> 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 = 0.01
> AND speculative_retry = '99.0PERCENTILE';
>
> And cassandra stress create the next string to the field kvalue of type
> text:
>
> "P*d,xY\x03m\x1b\x10\x0b$\x04pt-G\x08\n`7\x1fs\x15kH\x02i1\x16jf%YM"
>
> what bothers me is that kvalue has control characters like \x03. do you
> guys know any way to avoid creating this kind of characters while using
> cassandra-stress?
>
>
>
> Thank you very much
>
> Jean Carlo
>
> "The best way to predict the future is to invent it" Alan Kay
>
There is no way to avoid the control characters (<32 and ==127), other than
modifying the source code, which is located in
tools/stress/src/org/apache/cassandra/stress/generate/values/Strings.java.
Changing this line:
chars[i++] = (char) (((v & 127) + 32) & 127);
with this:
chars[i++] = (char) (((v & 127) % 95) + 32);
should work but I could not avoid the expensive modulo operation. You can
rebuild cassandra-stress with ant stress-build.
I wonder if the original intention was to avoid control characters however,
given the +32 in the original line. For this reason I've copied this
message to the dev mailing list.
--
[image: datastax_logo.png] <http://www.datastax.com/>
Stefania Alborghetti
Apache Cassandra Software Engineer
|+852 6114 9265| stefania.alborghe...@datastax.com
