#2572
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Ran 03 May 2021 02:06AM UTC

Jobs 1

Files 73

Run time 4s

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Build # #2572

Build Type

push

github-actions

Committed by

ben-manes

Commit Message

Add clarifying JavaDoc (see #537)

In #537, a deadlock occurs because the reload operation blocks waiting
for other reloads to complete. This is to batch the individual reloads
through a blocking queue, which drains tasks as work is performed. Due
to in-flight reloads being tracked by a secondary map, the triggering
of a reload is performed with a map computation. This ensures that a
stale reload does not insert outdated data by the entry being removed
when the reload completes or the original entry was removed / modified.

Due to a reload blocking on a map lock, when the batch completes the
future's callback to remove the entry collides on the same map lock
due to hashing. This causes the task queue to never be reduced to
allow more work, so the reload holding the lock is stuck forever. Due
to hash collisions, other usages of the map (like eviction) may
collide and fully disrupt the cache from performing any more writes.

Coverage Stats

6194 of 6695 relevant lines covered (92.52%)

0.93 hits per line

Jobs

ID	Job ID	Ran	Files	Coverage
1	#2572.1	03 May 2021 02:06AM UTC	0	92.52

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