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From "Vladimir Tsanev (Created) (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-3861) get_indexed_slices throws OOM Error when is called with too big indexClause.count
Date Mon, 06 Feb 2012 16:22:03 GMT
get_indexed_slices throws OOM Error when is called with too big indexClause.count

                 Key: CASSANDRA-3861
             Project: Cassandra
          Issue Type: Bug
          Components: API, Core
    Affects Versions: 1.0.7
            Reporter: Vladimir Tsanev

I tried to call get_index_slices with Integer.MAX_VALUE as IndexClause.count. Unfortunately
the node died with OOM. In the log there si following error:

ERROR [Thrift:4] 2012-02-06 17:43:39,224 (line 3252) Internal error processing
java.lang.OutOfMemoryError: Java heap space
	at java.util.ArrayList.<init>(
	at org.apache.cassandra.service.StorageProxy.scan(
	at org.apache.cassandra.thrift.CassandraServer.get_indexed_slices(
	at org.apache.cassandra.thrift.Cassandra$Processor$get_indexed_slices.process(
	at org.apache.cassandra.thrift.Cassandra$Processor.process(
	at org.apache.cassandra.thrift.CustomTThreadPoolServer$
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(
	at java.util.concurrent.ThreadPoolExecutor$

Is it necessary to allocate all the memory in advance. I only have 3 KEYS that match my caluse.
I do not known the exact number but in general I am sure that they wil fit in the memory.
I can/will implement some calls with paging, but wanted to test and I am not happy with the
fact the node disconnected.

I wonder why ArrayList is used here?
I think the result is never accessed by index (but only iterated) and the subList for non
RandomAccess Lists (for example LinkedList) will do the same job if you are not using other
operations than iteration.

Is this related to the problem described in CASSANDRA-691.

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