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Bug #21844
closedObjecter::C_ObjectOperation_sparse_read throws/catches exceptions on -ENOENT
Status:
Resolved
Priority:
High
Assignee:
Jason Dillaman
Category:
Performance/Resource Usage
Target version:
-
% Done:
0%
Source:
Tags:
Backport:
luminous,jewel
Regression:
No
Severity:
3 - minor
Reviewed:
Affected Versions:
ceph-qa-suite:
Component(RADOS):
Pull request ID:
Crash signature (v1):
Crash signature (v2):
Description
Running RBD small IO performance tests against a mostly sparse image shows that the Objecter is throwing/catching a buffer decode error. The object doesn't exist so the op failed with -ENOENT, but the sparse_read finisher is still run and attempts to decode an empty bufferlist. This results in a non-negligible amount of CPU being wasted on throwing and immediately catching an exception when instead the decode should never have been attempted since the object didn't exist.
- 14.21% Objecter::handle_osd_op_reply
- 7.64% Context::complete
- 6.83% ObjectOperation::C_ObjectOperation_sparse_read::finish
- 6.15% ceph::buffer::list::iterator_impl<false>::copy
- 5.94% __cxa_throw
- 5.75% _Unwind_RaiseException
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