Yakov Zhdanov created IGNITE-4646:
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Summary: Try to unmarshall direct messages in striped pool
Key: IGNITE-4646
URL: https://issues.apache.org/jira/browse/IGNITE-4646
Project: Ignite
Issue Type: Improvement
Reporter: Yakov Zhdanov
Fix For: 2.0
During marshalling in NIO thread the following should be added to the write
buffer and sent to peer:
1. chunk size - 16 bits (this probably puts limitation on max write buffer size
of 64k or will require some changes to direct writer)
2. last chunk - 1 bit
3. pool policy - 8 bits
Here is the scheme to explain how this should work.
{noformat}
[chunk size] [pool policy] [partition] [last flag] [chunk data] X <-- no more
space in write buffer
[next chunk size] [last flag] [chunk data] <<-- we write next chunk once some
space is available in write buffer, but we skip partition and policy flags and
maybe others that should be sent only once.
...
...
[next chunk size] [last flag] [chunk data] <<-- last flag is true here
{noformat}
Examples
Write buffer - 64k
Message - 84k
# sender reserves space for chunk size
# reserves space for policy and last chunk flag
# marshalls message to buffer while it has free space (64k - SPACE will be
written to buffer)
# puts size and flags to reserved space in the beginning
# sends buffer or part of it which makes some space available to further writes
# reserves space for next chunk size and flags
# marshalls message to buffer while it has free space (lets assume the rest of
message fits)
# puts size and last=true to the reserved space and sends
Receiver:
# reads chunk size, stores the target pool and partition
# allocates heap buffer and copies chunk data to it from read buffer
# once all message chunks are fully read message should be submitted to a pool
where it will be unmarshalled and processed
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