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https://issues.apache.org/jira/browse/HDDS-1529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16882434#comment-16882434
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Hanisha Koneru commented on HDDS-1529:
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[~hgadre], HDDS-1496 adds support to read partial chunks. When chunks are read
from disk, they are stored in a local buffer and then the required part of the
chunk is copied to the client buffer. This is required when the chunk boundary
to be read does not coincide with the checksum boundary. But when we are
reading the whole chunk, we do not need to do double copy i.e. copy from disk
to local buffer and then to client buffer. We can directly copy the date from
disk to client buffer.
Please let me know if this makes sense or if you have any questions.
> BlockInputStream: Avoid buffer copy if the whole chunk is being read
> --------------------------------------------------------------------
>
> Key: HDDS-1529
> URL: https://issues.apache.org/jira/browse/HDDS-1529
> Project: Hadoop Distributed Data Store
> Issue Type: Improvement
> Reporter: Hanisha Koneru
> Assignee: Hrishikesh Gadre
> Priority: Major
>
> Currently, BlockInputStream reads chunk data from DNs and puts it in a local
> buffer and then copies the data to clients buffer. This is required for
> partial chunk reads where extra chunk data than requested might have to be
> read so that checksum verification can be done. But if the whole chunk is
> being read, we can copy the data directly into client buffer and avoid double
> buffer copies.
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