Yes, you can use multiple ioctxs with the same underlying rados connection. There's no hard limit on how many, it depends on your usage if/when a single rados connection becomes a bottleneck.
It's safe to use different ioctxs from multiple threads. IoCtxs have some local state like namespace, object locator key and snapshot that limit what you can do safely with multiple threads using the same IoCtx. librados.h has more details, but it's simplest to use a separate ioctx for each thread.
Josh
From: Michel Hollands <MHollands@xxxxxxxxxxx>
Sent: Apr 8, 2015 6:54 AM
To: ceph-users@xxxxxxxx
Subject: [ceph-users] Number of ioctx per rados connection
Sent: Apr 8, 2015 6:54 AM
To: ceph-users@xxxxxxxx
Subject: [ceph-users] Number of ioctx per rados connection
Hello,
This is a question about the C API for librados. Can you use multiple “IO contexts” (ioctx) per rados connection and if so how many ? Can these then be used by multiple threads ?
Thanks in advance,
Michel
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