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Bug #51735
open[pwl] IO hang when the size of an IO exceeds the size of the cache
% Done:
0%
Source:
Tags:
Backport:
Regression:
No
Severity:
3 - minor
Reviewed:
Affected Versions:
ceph-qa-suite:
Pull request ID:
Crash signature (v1):
Crash signature (v2):
Description
IO hang when the size of an IO exceeds the size of the cache.
Root cause:
AbstractWriteLog<I>::check_allocation(){
if (m_bytes_allocated + bytes_allocated > m_bytes_allocated_cap) {}
}
This check will set alloc false, and never pass this check.
Expected behavior: when the IO size exceeds the cache size, it bypasses the cache and writes directly to OSD.
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