....it does not support the CQL types ...
do you mean cql type in here?
http://docs.datastax.com/en/cql/3.1/cql/cql_reference/cql_data_types_c.html
if so, i ran cassandra 2.2.0 beta1 with this.
cqlsh:jw_schema1> desc table all_data_types;
CREATE TABLE jw_schema1.all_data_types (
type_ascii ascii PRIMARY KEY,
type_bigint bigint,
type_blob blob,
type_boolean boolean,
type_decimal decimal,
type_double double,
type_float float,
type_inet inet,
type_int int,
type_list list<int>,
type_map map<text, text>
) WITH bloom_filter_fp_chance = 0.01
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 = 0.0
AND speculative_retry = '99.0PERCENTILE';
cqlsh:jw_schema1> select * from all_data_types;
type_ascii | type_bigint | type_blob | type_boolean | type_decimal |
type_double | type_float | type_inet | type_int | type_list | type_map
-------------+-------------+-----------+--------------+--------------+-------------+------------+-----------+----------+-----------+------------------
primary key | 1234567890 | 0x12 | True | 10 |
33 | 12.34 | 127.0.0.1 | 123 | [1, 2, 3] | {'key': 'value'}
(1 rows)
well, not all data type in cql per se but some yes, and then flush the data
into sstable..and use sstable2json
$ ../tools/bin/sstable2json
../data/all_data_types-84ff26d0054311e5b4ecdf2eb198bdde/la-1-big-Data.db
[
{"key": "primary key",
"cells": [["","",1432823024401968],
["type_bigint","1234567890",1432823024401968],
["type_blob","12",1432823024401968],
["type_boolean","true",1432823024401968],
["type_decimal","10",1432823024401968],
["type_double","33.0",1432823024401968],
["type_float","12.34",1432823024401968],
["type_inet","127.0.0.1",1432823024401968],
["type_int","123",1432823024401968],
["type_list:_","type_list:!",1432823079281149,"t",1432823079],
["type_list:462c9f80054511e5b4ecdf2eb198bdde","00000001",1432823079281150],
["type_list:462c9f81054511e5b4ecdf2eb198bdde","00000002",1432823079281150],
["type_list:462c9f82054511e5b4ecdf2eb198bdde","00000003",1432823079281150],
["type_map:_","type_map:!",1432823024401967,"t",1432823024],
["type_map:6b6579","76616c7565",1432823024401968]]}
]
for the list and map, i think you need to decode further but sstable2json
should serve as a start?
https://github.com/apache/cassandra/blob/cassandra-2.2.0-beta1/src/java/org/apache/cassandra/tools/SSTableExport.java
hth
jason
On Tue, May 26, 2015 at 10:16 PM, Malcolm Matalka <[email protected]>
wrote:
> The current code I have is using SSTableReader (like sstable2json) and
> then trying to interpret the bytes with the help of CFMetaData.
>
> Any pointers for where in the Cassandra codebase I could see how this is
> done?
>
> Thanks for the help.
>
>
> 2015-05-26 16:07 GMT+02:00 Tyler Hobbs <[email protected]>:
> > Trying to parse and export an sstable at a higher, CQL level with the
> > current codebase is going to be pretty tough. Handling static columns,
> > collections (multi-cell columns), and the four minor variants of sstable
> > formats (sparse vs dense, composite vs simple) is not easy. If you want
> to
> > handle things at a CQL level, you should probably go through the normal
> > read path.
> >
> > With that said, CASSANDRA-8099 will substantially change the format of
> > sstables to more closely match CQL, making this more feasible.
> >
> > On Tue, May 26, 2015 at 8:49 AM, Malcolm Matalka <[email protected]>
> > wrote:
> >
> >> Thanks Tyler,
> >>
> >> The problem with sstable2json is that it does not support the CQL
> >> types as far as I can see and there isn't any indication as to modify
> >> it to do that. It seems like the CQL things are a layer above the
> >> SSTable.
> >>
> >> 2015-05-26 15:44 GMT+02:00 Tyler Hobbs <[email protected]>:
> >> > I would start by looking at sstable2json. It may be simplest for you
> to
> >> > run sstable2json and then process the resulting json. If that's not
> >> > adequate, modifying the sstable2json code is probably your best bet.
> >> >
> >> > On Mon, May 25, 2015 at 11:12 AM, Malcolm Matalka <
> [email protected]>
> >> > wrote:
> >> >
> >> >> Hello,
> >> >>
> >> >> For efficiency reasons I am trying to parse the raw SSTable files in
> >> >> order to transform them into another format. I understand this is
> >> >> like poking a sleeping beast and there aren't many guarantees around
> >> >> this but I'm asking if anyone has any pointers to make this possible?
> >> >> In a search I have stumbled upon FullContact's SSTable parser, but it
> >> >> does not parse the complicated data structures that CQL supports. In
> >> >> attempting to reverse engineer how Cassandra handles the actual data
> >> >> there are a few cases that are unclear and I'm concerned that my
> >> >> attempts to interpret them will result in a fragile result.
> >> >>
> >> >> Are there any suggestions? Existing libraries? Tips on how
> Cassandra
> >> >> parses the data itself? Pointers into the code to read? SSTable
> >> >> design doc?
> >> >>
> >> >> Thanks,
> >> >> /Malcolm
> >> >>
> >> >
> >> >
> >> >
> >> > --
> >> > Tyler Hobbs
> >> > DataStax <http://datastax.com/>
> >>
> >
> >
> >
> > --
> > Tyler Hobbs
> > DataStax <http://datastax.com/>
>
