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https://issues.apache.org/jira/browse/HDFS-17545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17873386#comment-17873386
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ASF GitHub Bot commented on HDFS-17545:
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KeeProMise opened a new pull request, #6871:
URL: https://github.com/apache/hadoop/pull/6871
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### Description of PR
please see: https://issues.apache.org/jira/browse/HDFS-17545
NOTE: This is a sub-pull request (PR) related to
[HDFS-17531](https://issues.apache.org/jira/browse/HDFS-17531)(Asynchronous
router RPC). For more details or context, please refer to the main issue
[HDFS-17531](https://issues.apache.org/jira/browse/HDFS-17531)
More detailed documentation:
[HDFS-17531](https://issues.apache.org/jira/browse/HDFS-17531) Router
asynchronous rpc implementation.pdf and Aynchronous router.pdf
### How was this patch tested?
new UT TestRouterAsyncRpcClient
### For code changes:
- [x] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
- [ ] Object storage: have the integration tests been executed and the
endpoint declared according to the connector-specific documentation?
- [ ] If adding new dependencies to the code, are these dependencies
licensed in a way that is compatible for inclusion under [ASF
2.0](http://www.apache.org/legal/resolved.html#category-a)?
- [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`,
`NOTICE-binary` files?
> [ARR] router async rpc client.
> ------------------------------
>
> Key: HDFS-17545
> URL: https://issues.apache.org/jira/browse/HDFS-17545
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: rbf
> Reporter: Jian Zhang
> Assignee: Jian Zhang
> Priority: Major
> Labels: pull-request-available
>
> *Describe*
> 1. Mainly using AsyncUtil to implement {*}RouterAsyncRpcClient{*}, this class
> extends RouterRpcClient, enabling the {*}invoiceAll{*}, {*}invoiceMethod{*},
> {*}invoiceSequential{*}, {*}invoiceConcurrent{*}, and *invoiceSingle* methods
> to support asynchrony.
> 2. Use two thread pools, *asyncRouterHandler* and {*}asyncRouterResponder{*},
> to handle asynchronous requests and responses, respectively.
> 3. Added {*}DFS_ROUTER_RPC_ENABLE_ASYNC{*},
> {*}DFS_ROUTER_RPC_ASYNC_HANDLER_COUNT{*},
> *DFS_ROUTER_RPC_ASYNC_RESPONDER_COUNT_DEFAULT* to configure whether to use
> async router, as well as the number of asyncRouterHandlers and
> asyncRouterResponders.
> 4. Using *ThreadLocalContext* to maintain thread local variables, ensuring
> that thread local variables can be correctly passed between handler,
> asyncRouterHandler, and asyncRouterResponder.
>
> *Test*
> new UT TestRouterAsyncRpcClient
> Note: For discussions on *AsyncUtil* and client {*}protocolPB{*}, please
> refer to HDFS-17543 and HDFS-17544.
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