Robbie Gemmell created PROTON-857:
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Summary: reduce memory usage for the TransportSession link handle
tracking
Key: PROTON-857
URL: https://issues.apache.org/jira/browse/PROTON-857
Project: Qpid Proton
Issue Type: Improvement
Components: proton-j
Affects Versions: 0.10
Reporter: Robbie Gemmell
Assignee: Robbie Gemmell
Fix For: 0.10
The TransportSession class currently maintains two 'maps' of [local|remote]
handle->TransportLink using arrays of size handle-max + 1 (since we start from
0 when using handles, just like array indexes). The handle-max value used to be
1024 in proton-j but was recently changed to be 65536 in PROTON-844, allowing
us to track 65537 handles. This change exposes the transports already somewhat
inefficient storage of handles by requiring ~64x as much memory per open
session, which in most cases wont use the extra capacity and indeed may often
only need to use a single handle at a time (or worse, none, if a session isnt
actually used for some weird reason).
The handle tracking should be updated to use a HashMap, in similar fashion to
how the session channel numbers are tracked by the transport.
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