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https://issues.apache.org/jira/browse/HADOOP-18106?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mukund Thakur resolved HADOOP-18106.
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Resolution: Fixed
> Handle memory fragmentation in S3 Vectored IO implementation.
> -------------------------------------------------------------
>
> Key: HADOOP-18106
> URL: https://issues.apache.org/jira/browse/HADOOP-18106
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Reporter: Mukund Thakur
> Assignee: Mukund Thakur
> Priority: Major
> Labels: pull-request-available
> Time Spent: 3h 10m
> Remaining Estimate: 0h
>
> As we have implemented merging of ranges in the S3AInputStream implementation
> of vectored IO api, it can lead to memory fragmentation. Let me explain by
> example.
>
> Suppose client requests for 3 ranges.
> 0-500, 700-1000 and 1200-1500.
> Now because of merging, all the above ranges will get merged into one and we
> will allocate a big byte buffer of 0-1500 size but return sliced byte buffers
> for the desired ranges.
> Now once the client is done reading all the ranges, it will only be able to
> free the memory for requested ranges and memory of the gaps will never be
> released for eg here (500-700 and 1000-1200).
>
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