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https://issues.apache.org/jira/browse/HDFS-14484?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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xudongcao updated HDFS-14484:
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Attachment: HDFS-14484v0.patch
> Ozone: Freon: Support big files larger than 2GB and add "--bufferSize" and
> "--validateWrites" options.
> ------------------------------------------------------------------------------------------------------
>
> Key: HDFS-14484
> URL: https://issues.apache.org/jira/browse/HDFS-14484
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: benchmarks
> Reporter: xudongcao
> Assignee: xudongcao
> Priority: Major
> Attachments: HDFS-14484v0.patch
>
>
> *Current problems:*
> 1. Freon does not support big files larger than 2GB because it use an int
> type "keySize" parameter and also "keyValue" buffer size.
> 2. Freon allocates a entire buffer for each key at once, so if the key size
> is large and the concurrency is high, freon will report OOM exception
> frequently.
> 3. Freon lacks option such as "--validateWrites", so users cannot manually
> specify that verification is required after writing.
> *Some solutions:*
> 1. Use a long type "keySize" parameter, make sure freon can support big
> files larger than 2GB.
> 2. Use a small buffer repeatedly than allocating the entire key-size buffer
> at once, the default buffer size is 4K and can be configured by "–bufferSize"
> parameter.
> 3. Add a "--validateWrites" option to Freon command line, users can provide
> this option to indicate that a validation is required after write.
> 4. Remove the process of appending an uuid to each key, which is of little
> significance and complicates the code, especially when writting with a small
> buffer repeatedly.
>
>
>
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