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https://issues.apache.org/jira/browse/HDFS-12735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16244940#comment-16244940
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Tsz Wo Nicholas Sze commented on HDFS-12735:
--------------------------------------------
It needs a
[TaskQueue|https://github.com/apache/incubator-ratis/blob/master/ratis-common/src/main/java/org/apache/ratis/util/TaskQueue.java]
per object. I actually created it for the Ozone use case.
{code}
/**
* A queue with execution order guarantee such that
* each task is submitted for execution only if it becomes the head of the
queue.
* Tasks are executed sequentially without any overlap.
*
* By the definition of a queue, a task can become the head iff
* (1) the queue is empty when offering it, or
* (2) it is the next to the head and the head is polled out from the queue.
*
* A typically use case is to submit concurrent tasks
* with in-order guarantee for some of the tasks.
*
* One example use case is to submit tasks to write multiple files:
* - A file may requires multiple write tasks.
* - Multiple files are written at the same time.
* A solution is to create a {@link TaskQueue} for each file
* and then submit the write tasks to the corresponding queue.
* The files will be written concurrently and the writes to each file are
in-order.
*/
{code}
> Make ContainerStateMachine#applyTransaction async
> -------------------------------------------------
>
> Key: HDFS-12735
> URL: https://issues.apache.org/jira/browse/HDFS-12735
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Lokesh Jain
> Assignee: Lokesh Jain
> Labels: performance
> Attachments: HDFS-12735-HDFS-7240.000.patch,
> HDFS-12735-HDFS-7240.001.patch
>
>
> Currently ContainerStateMachine#applyTransaction makes a synchronous call to
> dispatch client requests. Idea is to have a thread pool which dispatches
> client requests and returns a CompletableFuture.
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