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From "Vaibhav Gumashta (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-13725) ACID: Streaming API should synchronize calls when multiple threads use the same endpoint
Date Fri, 10 Jun 2016 16:54:21 GMT

     [ https://issues.apache.org/jira/browse/HIVE-13725?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vaibhav Gumashta updated HIVE-13725:
------------------------------------
    Attachment: HIVE-13725.1.patch

> ACID: Streaming API should synchronize calls when multiple threads use the same endpoint
> ----------------------------------------------------------------------------------------
>
>                 Key: HIVE-13725
>                 URL: https://issues.apache.org/jira/browse/HIVE-13725
>             Project: Hive
>          Issue Type: Bug
>          Components: HCatalog, Metastore, Transactions
>    Affects Versions: 1.2.1, 2.0.0
>            Reporter: Vaibhav Gumashta
>            Assignee: Vaibhav Gumashta
>            Priority: Critical
>              Labels: ACID, Streaming
>         Attachments: HIVE-13725.1.patch
>
>
> Currently, the streaming endpoint creates a metastore client which gets used for RPC.
The client itself is not internally thread safe. Therefore, the API methods should provide
the relevant synchronization so that the methods can be called from different threads. A sample
use case is as follows:
> 1. Thread 1 creates a streaming endpoint and opens a txn batch.
> 2. Thread 2 heartbeats the txn batch.
> With the current impl, this can result in an "out of sequence response", since the response
of the calls in thread1 might end up going to thread2 and vice-versa.



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