Hanisha Koneru created HDDS-1496:
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Summary: readChunkFromContainer() should only read the required
part of chunk file
Key: HDDS-1496
URL: https://issues.apache.org/jira/browse/HDDS-1496
Project: Hadoop Distributed Data Store
Issue Type: Improvement
Reporter: Hanisha Koneru
Assignee: Hanisha Koneru
BlockInputStream#readChunkFromContainer() reads the whole chunk from disk even
if we need to read only a part of the chunk.
This Jira aims to improve readChunkFromContainer so that only that part of the
chunk file is read which is needed by client plus the part of chunk file which
is required to verify the checksum.
For example, lets say the client is reading from index 120 to 450 in the chunk.
And let's say checksum is stored for every 100 bytes in the chunk i.e. the
first checksum is for bytes from index 0 to 99, the next for bytes from index
100 to 199 and so on. To verify bytes from 120 to 450, we would need to read
from bytes 100 to 499 so that checksum verification can be done.
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