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Post From: Sierra Chart Data Feeds Start of Week Intermittent Market Depth Issue

[2020-06-11 09:24:52]
Sierra Chart Engineering - Posts: 104368
Over the last couple of months we have seen an intermittent issue at the start of a week, where some of the top levels of the market depth data on usually the ask side or only the ask side, are incorrect, and are below the values on the bid side, which should not be the case.

What we have observed with this, is that these are values from the prior week. They should have been cleared and it is unknown, why they exist.

When we hear about reports of the effect of this like the Trading DOM improperly displaying the current price and depth, we simply perform a reset of the internal connection for the real-time server processes which are affected. This is an intermittent issue only randomly occurring.

We have added additional logging to isolate the problem and we should have it figured out over the next 2 to 3 weeks but we need for it to occur again on a Sunday evening.


This affects the following data feeds:
Sierra Chart Exchange Data feed
Denali Exchange Data feed
Sierra Chart Cryptocurrency and Forex data with depth.

We are not sure if it affects data sent to a sub instance of Sierra Chart.

In general, the handling of large amounts of market depth data, 1000+ levels, and doing this efficiently, does have complexities and the recent performance improvement we have implemented, is revealing this issue. We will get it resolved. It is not going to be hard to figure out once we successfully capture the related data the moment of the event which is triggering it. That may take a couple of rounds of events. We may not capture it the first time, but with additional logging added on the second or third time we should be able to determine the reason for the problem.

The attached screenshot, highlights the levels on the ask side, for ESM20 at the start of this week which should not have been there.

Also, we have added correction code to filter out this condition as best as we can. So good chance, it is just not going to happen for the users any longer but we still will be monitoring for the underlying problem and get it resolved in the background. This code is being tested and will be fully released over the weekend.
Sierra Chart Support - Engineering Level

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Date Time Of Last Edit: 2020-06-11 17:52:22
imageMarket Depth Issue.png / V - Attached On 2020-06-11 09:24:09 UTC - Size: 15.47 KB - 313 views