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Posted to issues@spark.apache.org by "Yuance Li (JIRA)" <ji...@apache.org> on 2016/05/02 07:55:12 UTC
[jira] [Commented] (SPARK-3190) Creation of large graph(> 2.15 B
nodes) seems to be broken:possible overflow somewhere
[ https://issues.apache.org/jira/browse/SPARK-3190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15266145#comment-15266145 ]
Yuance Li commented on SPARK-3190:
----------------------------------
The PR{2106，7923} can not fix the problem completely, as the number of vertices in one of partition exceed Integer.MAX_VALUE also can repreduce this Bug。 The fundamental cause of this problem is the variable “size” is defined as type Int in class VertexPartitionBase.
> Creation of large graph(> 2.15 B nodes) seems to be broken:possible overflow somewhere
> ---------------------------------------------------------------------------------------
>
> Key: SPARK-3190
> URL: https://issues.apache.org/jira/browse/SPARK-3190
> Project: Spark
> Issue Type: Bug
> Components: GraphX
> Affects Versions: 1.0.3
> Environment: Standalone mode running on EC2 . Using latest code from master branch upto commit #db56f2df1b8027171da1b8d2571d1f2ef1e103b6 .
> Reporter: npanj
> Assignee: Ankur Dave
> Priority: Critical
> Fix For: 1.0.3, 1.1.0, 1.2.0, 1.3.2, 1.4.2, 1.5.0
>
>
> While creating a graph with 6B nodes and 12B edges, I noticed that 'numVertices' api returns incorrect result; 'numEdges' reports correct number. For few times(with different dataset > 2.5B nodes) I have also notices that numVertices is returned as -ive number; so I suspect that there is some overflow (may be we are using Int for some field?).
> Here is some details of experiments I have done so far:
> 1. Input: numNodes=6101995593 ; noEdges=12163784626
> Graph returns: numVertices=1807028297 ; numEdges=12163784626
> 2. Input : numNodes=2157586441 ; noEdges=2747322705
> Graph Returns: numVertices=-2137380855 ; numEdges=2747322705
> 3. Input: numNodes=1725060105 ; noEdges=204176821
> Graph: numVertices=1725060105 ; numEdges=2041768213
> You can find the code to generate this bug here:
> https://gist.github.com/npanj/92e949d86d08715bf4bf
> Note: Nodes are labeled are 1...6B .
>
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