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Posted to commits@cassandra.apache.org by "Thibaut (Updated) (JIRA)" <ji...@apache.org> on 2012/04/11 18:47:20 UTC
[jira] [Updated] (CASSANDRA-4137) QUORUM Multiget RangeSliceQuery
causes unnecessary writes to read entries
[ https://issues.apache.org/jira/browse/CASSANDRA-4137?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Thibaut updated CASSANDRA-4137:
-------------------------------
Priority: Major (was: Critical)
> QUORUM Multiget RangeSliceQuery causes unnecessary writes to read entries
> -------------------------------------------------------------------------
>
> Key: CASSANDRA-4137
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4137
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 0.8.9
> Reporter: Thibaut
>
> From the mailing list:
> I created a new test keyspace and added 10 000 keys to it. The cluster has 3 machines, RF=3, read repair disabled (enabling it didn't change anything). The keyspace doesn't contain any thumbstones. No keys were deleted.
> When I fetch a rangeslice through hector and set the consistency level to quorum, according to cfstats (and also to the output files on the hd), cassandra seems to execute a write request for each read I execute. The write count in cfstats is increased when I execute the rangeslice function over the same range again and again (without saving anything at all).
> If I set the consistency level to ONE or ALL, no writes are executed.
> I checked the writes on one machine. They increased by 2300 for each iteration over the 10000 keys. I didn't check, but this probably corresponds to the number of keys for which the machine is responsible.
> Code:
> Keyspace ks = getConnection(cluster, consistencylevel);
> RangeSlicesQuery<String, String, V> rangeSlicesQuery = HFactory.createRangeSlicesQuery(ks, StringSerializer.get(), StringSerializer.get(), s);
> rangeSlicesQuery.setColumnFamily(columnFamily);
> rangeSlicesQuery.setColumnNames(column);
> rangeSlicesQuery.setKeys(start, end);
> rangeSlicesQuery.setRowCount(maxrows);
> QueryResult<OrderedRows<String, String, V>> result = rangeSlicesQuery.execute();
> return result.get();
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