incubator-cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Richard Grossman <richie...@gmail.com>
Subject Re: Is the remove api working ??
Date Tue, 17 Nov 2009 08:45:50 GMT
Ok I'm going crazy !!!

The rows that I've deleted yesterday and I've checked there all these rows
have been deleted are come back like new inserted. Now I'm really going
crazy !!. How can it be ?



On Mon, Nov 16, 2009 at 8:06 PM, Freeman, Tim <tim.freeman@hp.com> wrote:

>  You get consistency if R + W > N, where R is the number of records to
> read, W is the number of records to write, and N is the replication factor.
> A ConsistencyLevel of ONE means R or W is 1.  A ConsistencyLevel of QUORUM
> means R or W is ceiling((N+1)/2).  A ConsistencyLevel of ALL means R or W is
> N.  So if you want to write with a ConsistencyLevel of ONE and then get the
> same data when you read, you need to read with ConsistencyLevel ALL.
>
>
>
> Tim Freeman
> Email: tim.freeman@hp.com
> Desk in Palo Alto: (650) 857-2581
> Home: (408) 774-1298
> Cell: (408) 348-7536 (No reception business hours Monday, Tuesday, and
> Thursday; call my desk instead.)
>
>
>
> *From:* Richard grossman [mailto:richiesgr@gmail.com]
> *Sent:* Monday, November 16, 2009 9:37 AM
>
> *To:* cassandra-user@incubator.apache.org
> *Subject:* Re: Is the remove api working ??
>
>
>
> Thanks
>
> The QUORUM params do the job as expected.
>
> But If I've multiple servers and have inserted the data with ONE then what
> it's means I need to use only QUORUM instead ?
>
> Thanks
>
> On Mon, Nov 16, 2009 at 7:27 PM, Freeman, Tim <tim.freeman@hp.com> wrote:
>
> You might want to try ConsistencyLevel.QUORUM instead of
> ConsistencyLevel.ONE if you're having issues with consistency.
>
>
>
> If you're running only one node, that shouldn't matter.
>
>
>
> Tim Freeman
> Email: tim.freeman@hp.com
> Desk in Palo Alto: (650) 857-2581
> Home: (408) 774-1298
> Cell: (408) 348-7536 (No reception business hours Monday, Tuesday, and
> Thursday; call my desk instead.)
>
>
>
> *From:* Richard grossman [mailto:richiesgr@gmail.com]
> *Sent:* Monday, November 16, 2009 9:19 AM
> *To:* cassandra-user@incubator.apache.org
> *Subject:* Is the remove api working ??
>
>
>
> Hi
>
> I try to delete a CF from List of keys that I get from get_key_range.
> Because I don't want to get all the key I just build bunch of 1000 key and
> delete them.
> All seems but the column are never removed If I run exactly the same code
> twice I get the key like never deleted.
>
> Could you help me ??
>
> here is the code I use:
>         List<String> keys = cassandraClient.get_key_range("Keyspace1",
> "channelShow", String.valueOf(start.getTimeInMillis()), stopKey, 1,
> ConsistencyLevel.ONE);
>         if (keys != null && keys.size() == 1) {
>             String startKey = keys.get(0);
>             do {
>                 keys = cassandraClient.get_key_range("Keyspace1",
> "channelShow", startKey, stopKey, 1000, ConsistencyLevel.ONE);
>
>                 long time = System.currentTimeMillis();
>                 for (String key : keys) {
>                     long timestamp = System.currentTimeMillis();
>                     cassandraClient.remove("Keyspace1", key, columnPath,
> timestamp, ConsistencyLevel.ONE);
>                 }
>
>                 if (keys.size() < 1000) {
>                     keys = null;
>                 } else {
>                     startKey = keys.get(keys.size() - 1);
>                 }
>             } while (keys != null && keys.size() > 0);
>         }
>
> All
>
>
>

Mime
View raw message