[CASSANDRA-1505] Bug with get_range_slices

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Duplicate

Environment

Java 1.6.0_21

• Severity: Normal
• Assignee: Unassigned
• Reporter: Imran Ahmed
• Created: 15/Sep/10 15:36
• Updated: 16/Apr/19 09:33
• Resolved: 15/Sep/10 15:51

Description

I was testing cassandra and trying to get iterate over a bunch of rows using the get_range_slices method.
In a loop I create small amount of data with this code:
for(int i=0;i<14;i++){
long timestamp = System.currentTimeMillis();
ColumnPath colPathName = new ColumnPath(CF_NAME);
colPathName.setColumn(propName.getBytes(UTF8));
client.insert(CASSANDRA_KEYSPACE, "my key "+i, colPathName, value, timestamp, ConsistencyLevel.ONE);
}

Next I try to iterate over the rows using this code:
Map<String, Map<String, byte[]>> rows = cs.getRows("", fetchSize);
//System.out.println(rows.size()+"-ROWS="+rows);

while(!rows.isEmpty()){
Iterator<String> it = rows.keySet().iterator();
while(it.hasNext()){
String key = it.next();
System.out.println(key+"-printing row:"+rows.get(key));
if(!it.hasNext())

{ System.out.println("reached end of current page. getting next page:"+key); rows = cs.getRows(key, fetchSize); System.out.println("obtained new row:"+rows); }

}
}

the getrows method basically calls the get slice, for the key and count passed [I have set the predicate as per the example posted on the cassandra wiki]:
ColumnParent parent = new ColumnParent(CF_NAME);
List<ColumnOrSuperColumn> results = client.get_slice(CASSANDRA_KEYSPACE, key, parent, predicate, ConsistencyLevel.ONE);

This goes in an endless loop. The keys are returned randomly and I am never able to successfully finish the iteration.

Here's the output. It seems to move forward a little and them goes in a wild loop:
total slices:2
my key 0-printing row:

{description=[B@1a786c3}

my key 1-printing row:

{description=[B@18088c0}

reached end of current page. getting next page:my key 1
total slices:2
obtained new row:{my key 1=

{description=[B@1922221}, my key 10={description=[B@fec107}}
my key 1-printing row:{description=[B@1922221}

my key 10-printing row:

{description=[B@fec107}

reached end of current page. getting next page:my key 10
total slices:2
obtained new row:{my key 10=

{description=[B@132e13d}, my key 11={description=[B@1617189}}
my key 10-printing row:{description=[B@132e13d}

my key 11-printing row:

{description=[B@1617189}

reached end of current page. getting next page:my key 11
total slices:2
obtained new row:{my key 12=

{description=[B@64f6cd}, my key 11={description=[B@872380}}
my key 12-printing row:{description=[B@64f6cd}

my key 11-printing row:

{description=[B@872380}

reached end of current page. getting next page:my key 11
total slices:2
obtained new row:{my key 12=

{description=[B@2bb514}, my key 11={description=[B@17d5d2a}}
my key 12-printing row:{description=[B@2bb514}

my key 11-printing row:

{description=[B@17d5d2a}

reached end of current page. getting next page:my key 11
total slices:2
obtained new row:{my key 12=

{description=[B@16fa474}, my key 11={description=[B@95c083}}
my key 12-printing row:{description=[B@16fa474}

my key 11-printing row:

{description=[B@95c083}

reached end of current page. getting next page:my key 11
total slices:2
obtained new row:{my key 12=

{description=[B@191d8c1}, my key 11={description=[B@2d9c06}}
my key 12-printing row:{description=[B@191d8c1}

my key 11-printing row:

{description=[B@2d9c06}

reached end of current page. getting next page:my key 11
total slices:2
obtained new row:{my key 12=

{description=[B@5e5a50}, my key 11={description=[B@7b6889}}
my key 12-printing row:{description=[B@5e5a50}

my key 11-printing row:

{description=[B@7b6889}

reached end of current page. getting next page:my key 11
total slices:2
.
.
.
Shouldn't iteration work normally like other common iteration patterns or do I need to do things differently with casssandra to get iteration working?

Issue Links

• relates to: CASSANDRA-1442 Get Range Slices is broken