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https://issues.apache.org/jira/browse/HAMA-129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12656889#action_12656889
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Edward J. Yoon commented on HAMA-129:
-------------------------------------
sometimes i recieved a NullPointerException.
----
08/12/16 14:18:34 INFO mapred.JobClient: Running job: job_200812152014_0058
08/12/16 14:18:35 INFO mapred.JobClient: map 0% reduce 0%
08/12/16 14:18:47 INFO mapred.JobClient: map 50% reduce 0%
08/12/16 14:18:55 INFO mapred.JobClient: map 50% reduce 8%
08/12/16 14:18:58 INFO mapred.JobClient: map 50% reduce 16%
08/12/16 14:19:16 INFO mapred.JobClient: Task Id :
attempt_200812152014_0058_m_000001_0, Status : FAILED
java.lang.NullPointerException
at org.apache.hama.DenseMatrix.getBlock(DenseMatrix.java:481)
at
org.apache.hama.algebra.BlockCyclicMultiplyMap.map(BlockCyclicMultiplyMap.java:75)
at
org.apache.hama.algebra.BlockCyclicMultiplyMap.map(BlockCyclicMultiplyMap.java:39)
at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:47)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:227)
at
org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2207)
> Improving speed of matrix multiplication
> ----------------------------------------
>
> Key: HAMA-129
> URL: https://issues.apache.org/jira/browse/HAMA-129
> Project: Hama
> Issue Type: Improvement
> Components: implementation
> Affects Versions: 0.1.0
> Reporter: Edward J. Yoon
> Assignee: Edward J. Yoon
> Fix For: 0.1.0
>
> Attachments: HAMA-129.patch, HAMA-129_v01.patch, HAMA-129_v02.patch
>
>
> We use a blockinputformat (row based partitioning). but it causes
> "java.lang.OutOfMemoryError: Java heap space" when size is big.
> I'll write the formulas and partition them as PIEstimator.
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