Hi all...
I am having a pretty tough time retrieving binary values out of my DB...
I am using cassandra 0.5.1 on Centos 5.4 with java 1.6.0-19
Here is the simple test I am trying to run in C++
/* snip initialization */
{
transport->open();
ColumnPath new_col;
new_col.__isset.column = true; /* this is required! */
new_col.column_family.assign("Standard2");
new_col.super_column.assign("");
new_col.column.assign("testing");
char *data_cstr="this\0 is\0 data!";
std::string data;
data.assign(data_cstr, 15);
printf("Data '%s' has length %lu\n", data.c_str(), data.length());
// This properly returns 15
client.insert("Keyspace1","newone",new_col,data,55,ONE);
ColumnOrSuperColumn ret_val;
client.get(ret_val,"Keyspace1","newone",new_col,ONE);
printf("Column name retrieved is: %s\n", ret_val.column.name.c_str());
printf("Value in column retrieved is: %s\n", ret_val.column.value.c_str());
// This only ever returns 'this' (i.e., everything before the first \0)
// I understand null termination in %s... see below
printf("Value has length %lu\n", ret_val.column.value.length());
// and this gives me 4
transport->close();
}
/* snip the rest too! */
Am I missing something major in proceeding this way?
I have tried GDB and eventually all I get back is a string containing 'this'.
Here is the dumped content of Keyspace1/Standard2-1-Data.db...
od -c /u01/cassandra/data/Keyspace1/Standard2-1-Data.db
0000000 \0 - 1 1 5 5 7 1 6 5 7 6 3 3 4 2
0000020 7 0 7 9 0 1 4 5 2 8 3 5 8 0 2 3
0000040 7 5 1 9 9 5 2 8 : n e w o n e \0
0000060 \0 \0 264 \0 \0 \0 U \0 \0 \0 003 254 355 \0 005 s
0000100 r \0 020 j a v a . u t i l . B i t
0000120 S e t n 375 210 ~ 9 4 253 ! 003 \0 001 [ \0
0000140 004 b i t s t \0 002 [ J x p u r \0 002
0000160 [ J x 004 265 022 261 u 223 002 \0 \0 x p \0
0000200 \0 \0 001 \0 202 \b \0 \0 \0 \0 \0 x \0 \0 \0 "
0000220 \0 \a t e s t i n g \0 \a t e s t i
0000240 n g \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0
0000260 \0 % 200 \0 \0 \0 200 \0 \0 \0 \0 \0 \0 \0 \0 \0
0000300 \0 001 \0 \a t e s t i n g \0 \0 \0 \0 \0
0000320 \0 \0 \0 7 \0 \0 \0 017 t h i s \0 i s
0000340 \0 d a t a !
0000347
This shows that the data is stored properly to the db file.
# bin/cassandra-cli -host localhost
Connected to localhost/9160
Welcome to cassandra CLI.
cassandra> get Keyspace1.Standard2['newone']
=> (column=testing, value=this is data!, timestamp=55)
Returned 1 results.
Shows the same thing! It's there !!!
I would lean towards a Thrift interface problem...
In any case... I'd be thankful if someone had a pointer/workaround to this
show-stopper
of mine...
Best
Chris.
