[CASSANDRA-4468] Temporally unreachable Dynamic Composite column names.

• Type: Bug
• Status: Resolved
• Priority: Low
• Resolution: Duplicate
• Labels: persistence

Environment

linux,

• Severity: Low
• Assignee: Unassigned
• Reporter: Cesare Cugnasco
• Created: 28/Jul/12 18:23
• Updated: 16/Apr/19 09:32
• Resolved: 26/Oct/12 09:42

Description

I was working on a Column family with a DynamicComposite column sorter when I noticed that sometimes, after the insertion of a column with a column name composed by a single string (eg 's@step'),it was possible to be reach the column only by slice query but not by direct access. For example using the cassandra-cli it is possible to query:
get frame[int(26)];
RowKey: 0000001a
....
(column=i@19, value=00000013, timestamp=1343495134729000)
=> (column=s@step, value=746573742076616c7565, timestamp=1343495134680000)

but typing 'get frame[int(26)]['s@step']' I got no result.

I tested this behavior using also other clients such as Hector, Astyanax, Pycassa and directly Thrift.

I wrote this java code with hector-core-1.1.0 to reproduce this bug.

public static void main(String[] args) {
String kname = "testspace3";
Cluster myCluster = HFactory.getOrCreateCluster("Test-cluster", System.getProperty("location", "localhost:9160"));
//creating the keyspace and Column family
if (myCluster.describeKeyspace(kname) != null)

{ myCluster.dropKeyspace(kname, true); }

ColumnFamilyDefinition cfd = HFactory.createColumnFamilyDefinition(kname, "frame", ComparatorType.DYNAMICCOMPOSITETYPE);
cfd.setComparatorTypeAlias(DynamicComposite.DEFAULT_DYNAMIC_COMPOSITE_ALIASES);
KeyspaceDefinition kdf = HFactory.createKeyspaceDefinition(kname, "SimpleStrategy", 1, Arrays.asList(cfd));
myCluster.addKeyspace(kdf, true);
Keyspace ksp = HFactory.createKeyspace(kname, myCluster);
//Hector template definition
ColumnFamilyTemplate<Integer, DynamicComposite> template =
new ThriftColumnFamilyTemplate<Integer, DynamicComposite>(
ksp,
"frame",
IntegerSerializer.get(),
DynamicCompositeSerializer.get());

DynamicComposite dc = new DynamicComposite();
dc.addComponent("step", StringSerializer.get());
DynamicComposite numdc = new DynamicComposite();
numdc.addComponent(BigInteger.valueOf(62), BigIntegerSerializer.get());
ColumnFamilyUpdater<Integer, DynamicComposite> cf = template.createUpdater(26);
cf.setString(dc, "test value");
cf.setString(numdc, "altro valore");
template.update(cf);
//without this parts it works. It works also with less then 4 insertions
cf = template.createUpdater(26);
for (int i = 0; i < 4; i++)

{ DynamicComposite num = new DynamicComposite(); num.addComponent(BigInteger.valueOf(i), BigIntegerSerializer.get()); cf.setInteger(num, i); }

template.update(cf);
// end part
HColumn<DynamicComposite, String> res = template.querySingleColumn(26, dc, StringSerializer.get());
if (res == null)

{ System.out.println("[FAIL] Row not found"); }

else

{ System.out.println("[SUCCESS] Returned name " + res.getName().get(0).toString() + " - with value: " + res.getValue()); }

}

The code acts three tasks: configure keyspace an CF, insert the data and try to retrieve it. After running the code the data are visible (by list for example) but not reachable directly. Restarting Cassandra the row is again reachable.

Furthermore, after running that code, if I run on the cassandra-cli
set frame[int(26)]['s@step']=utf8(test);

with a "list frame[int(26)]'
RowKey: 0000001a
=> (column=s@step, value=test value, timestamp=1343499335791000)
=> (column=i@0, value=00000000, timestamp=1343499335816000)
=> (column=i@1, value=00000001, timestamp=1343499335816000)
=> (column=i@2, value=00000002, timestamp=1343499335816000)
=> (column=i@3, value=00000003, timestamp=1343499335816000)
=> (column=s@step, value=test, timestamp=1343499384630000)

I found 2 column with the apparently the same column name.

How is it possible?

Best regards,

Cesare