SebastianGruza commented on PR #3221:
URL: https://github.com/apache/hugegraph/pull/3221#issuecomment-5910090941

   Round 4 in 517dfe68: `StorageReadiness.check` without `synchronized`, one 
in-flight probe shared by concurrent callers with a bounded wait 
(`StorageReadinessTest` 8/8). The gate on a read through the graph path was 
built in three variants and measured on k3s: in every one a rolling Store 
restart takes all Servers out of the Service while the traffic is fine, and 
with PD down a probe through the shared Store client raises the load failures 
from 2/244 to 58-87 %, because a failed read invalidates the partition cache 
the queries use; details in the inline reply and in 
`results/issue-3212/round4-*` of the validation repo. The gate stays on the 
ping, its scope is now stated in the Javadoc and in the description; the 
control battery is 7/7 PASS on this head.
   


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