dosubot[bot] commented on issue #3125:
URL: https://github.com/apache/hugegraph/issues/3125#issuecomment-5117463233

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   Good catch — I can confirm the bug. In both `getBlockingStub` and 
`getAsyncStub` initialization paths, `channels[index]` is used where 
`channels[i]` should be, so all `concurrency` stub entries end up bound to the 
same `ManagedChannel` 
[[1]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-store/hg-store-client/src/main/java/org/apache/hugegraph/store/client/grpc/AbstractGrpcClient.java#L106-L111)
 
[[2]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-store/hg-store-client/src/main/java/org/apache/hugegraph/store/client/grpc/AbstractGrpcClient.java#L146-L153).
   
   I didn't find any existing PR that fixes this. The related issue #3124 you 
filed does mention this as a "separate channel-pool indexing defect" to be 
tracked independently, so this issue is a good standalone report for it 
[[3]](https://github.com/apache/hugegraph/issues/3124).
   
   The fix (`channels[index]` → `channels[i]`) and the suggested test approach 
both look correct. One additional thing worth noting: the async path uses 
`.parallel()` on the `IntStream` 
[[4]](https://github.com/apache/hugegraph/blob/9126c80e414c073b60fc074361b211cfb409e0eb/hugegraph-store/hg-store-client/src/main/java/org/apache/hugegraph/store/client/grpc/AbstractGrpcClient.java#L146),
 so a test for that variant should also verify thread-safety of the recorded 
channel identities (e.g., use a `ConcurrentHashMap` or similar to collect them).
   
   
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