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https://issues.apache.org/jira/browse/HADOOP-17144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17184793#comment-17184793
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Masatake Iwasaki commented on HADOOP-17144:
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{quote}user's compressed data input will be first kept in userBuf and in
setInputFromSavedData userBuf will be put in compressedDirectBuf , as the
compressed data length could be greater than source length we need to expanded
the buffer
{quote}
The userBuf contains whole input data which is not processed in one path.
Lz4Decompressor#setInputFromSavedData copies the part of the userBuf to
compressedDirectBuf (working buffer) considering the capacity. User repeatedly
calls {{decompress}} and {{needsInput}} until all data in the userBuf are
consumed (then feeds new input by {{setInput}}). We can not expect the
compressedDirectBuf can hold whole input at a time.
> Update Hadoop's lz4 to v1.9.2
> -----------------------------
>
> Key: HADOOP-17144
> URL: https://issues.apache.org/jira/browse/HADOOP-17144
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Hemanth Boyina
> Assignee: Hemanth Boyina
> Priority: Major
> Attachments: HADOOP-17144.001.patch, HADOOP-17144.002.patch,
> HADOOP-17144.003.patch, HADOOP-17144.004.patch
>
>
> Update hadoop's native lz4 to v1.9.2
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