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https://issues.apache.org/jira/browse/CARBONDATA-253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15499715#comment-15499715
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ASF GitHub Bot commented on CARBONDATA-253:
-------------------------------------------
GitHub user kumarvishal09 opened a pull request:
https://github.com/apache/incubator-carbondata/pull/170
[CARBONDATA-253]OOM issue if distribution is based on blocklet duing query
execution
Problem:In case of query execution when distribution is based on blocklet
same blocks are getting loaded multiple times this is because hash code and
equals method contract is not same, this is can cause OOM issue if distribution
is based on blocklet
Solution: As same class will be used to identify unique blocks while
distribution and while loading so creating a wrapper class and implementing
hash code and equals method based on filepath, offset and length, this will
remove duplicate blocks and only one block's metadata will be loaded in memory
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/kumarvishal09/incubator-carbondata
equalsAndHashCodeIssue
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-carbondata/pull/170.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #170
----
commit 49a76db0ff8e63fc95a309984d215086d888fc7b
Author: kumarvishal <kumarvishal.1...@gmail.com>
Date: 2016-09-17T13:25:36Z
equalsAndHashCodeIssue
----
> Duplicate block loading when distribution is based on blocklet
> --------------------------------------------------------------
>
> Key: CARBONDATA-253
> URL: https://issues.apache.org/jira/browse/CARBONDATA-253
> Project: CarbonData
> Issue Type: Bug
> Reporter: kumar vishal
> Assignee: kumar vishal
>
> In case of query execution when distribution is based on blocklet same blocks
> are getting loaded multiple times this is because hash code and equals method
> contract is not same
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