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https://issues.apache.org/jira/browse/HDFS-3246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16783945#comment-16783945
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Wei-Chiu Chuang commented on HDFS-3246:
---------------------------------------
I"m trying to understand the implementation within CryptoInputStream but it's
not that straightforward and my math is rough.
That said, I think you were trying to imitate {{decrypt(long position, byte[]
buffer, int offset, int length)}}, and I think I spot some math errors. The
variable names are confusing, which probably explains part of the errors.
{code:java}
while (len < n) {
buf.position(start + len);
buf.limit(start + len + Math.min(n - len, inBuffer.remaining()));
inBuffer.put(buf);
// Do decryption
try {
decrypt(decryptor, inBuffer, outBuffer, padding);
buf.position(start + len); --> not needed?
buf.limit(limit); --> not needed?
len += outBuffer.remaining(); --> len += Math.min(n - len,
inBuffer.remaining())?
buf.put(outBuffer);
} finally {
padding = afterDecryption(decryptor, inBuffer, "position + n", iv); -->
position + len?
}
}
{code}
> pRead equivalent for direct read path
> -------------------------------------
>
> Key: HDFS-3246
> URL: https://issues.apache.org/jira/browse/HDFS-3246
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs-client, performance
> Affects Versions: 3.0.0-alpha1
> Reporter: Henry Robinson
> Assignee: Sahil Takiar
> Priority: Major
> Attachments: HDFS-3246.001.patch, HDFS-3246.002.patch,
> HDFS-3246.003.patch, HDFS-3246.004.patch, HDFS-3246.005.patch,
> HDFS-3246.006.patch
>
>
> There is no pread equivalent in ByteBufferReadable. We should consider adding
> one. It would be relatively easy to implement for the distributed case
> (certainly compared to HDFS-2834), since DFSInputStream does most of the
> heavy lifting.
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