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From "Till Westmann" <ti...@apache.org>
Subject Re: Possible Race condition in the new UTF8String implementation
Date Wed, 11 Nov 2015 16:32:51 GMT
https://issues.apache.org/jira/browse/ASTERIXDB-1164
might be related.

Cheers,
Till

On 11 Nov 2015, at 8:25, abdullah alamoudi wrote:

> Hi all,
> I am having a hard time figuring this out. Here are the symptoms I am
> seeing in case one has an idea what this could be.
>
> I have a feed running ingesting data into a dataset. sporadically, I get
> duplicate key exception errors (The key is of a string type) and I am 100%
> sure that I don't have duplicate records.
>
> Moreover, I am printing the content of the frames about to be inserted into
> the primary index and there are no duplicate records.
>
> There are three reasons why I am suspecting the String implementation:
> 1. It is fairly recent change.
> 2. When I run on a single node, or run one thread at a time, I never get
> this exception.
> 3. the key is a String.
>
> I have looked at the change trying to figure out where a race condition
> might take place but it is well hidden (if it is true at all.).
>
> Let me know if you have seen something similar.
>
> Cheers,
> Abdullah.

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