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Day: February 28, 2020

Making a Better Pie Chart

Published 2020-02-28 by Kevin Feasel

Elizabeth Ricks tries the impossible:

A friend called me recently and started our conversation with: “I know you dislike pie charts, but…can you help me create one?” 

Spoiler alert: I don’t hate pie charts. They’ve received a bad rap over the years and with good reason—they are very commonly used when another chart type would be better suited. The appropriate use case for a pie chart is expressing a part-to-whole relationship. Their limitation is that it can be difficult to accurately judge the relative size of and compare the segments. Here are some related articles on our blog: the great pie debate and an updated post on pies. 

Elizabeth does put together the best possible case, but I’m still in favor of burning pie charts to the ground.

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Hive: Shuffle Failed with Too Many Fetch Failures

Published 2020-02-28 by Kevin Feasel

Dmitry Tolpeko takes us through an ugly error:

On one of the clusters I noticed an increased rate of shuffle errors, and the restart of a job did not help, it still failed with the same error.

The error was as follows:

Error: Error while running task ( failure ) : org.apache.tez.runtime.library.common.shuffle.orderedgrouped.Shuffle$ShuffleError: error in shuffle in Fetcher at org.apache.tez.runtime.library.common.shuffle.orderedgrouped.Shuffle$RunShuffleCallable.callInternal (Shuffle.java:301)

Caused by: java.io.IOException: Shuffle failed with too many fetch failures and insufficient progress!failureCounts=1, pendingInputs=1, fetcherHealthy=false, reducerProgressedEnough=true, reducerStalled=true

Click through to understand what this error means and what you can do about it.

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Distinct Counts in Power Query

Published 2020-02-28 by Kevin Feasel

Reza Rad shows how you can get a distinct count in Power Query:

You can have a distinct count calculation in multiple places in Power BI, through DAX code, using the Visual’s aggregation on a field, or even in Power Query. If you are doing the distinct count in Power Query as part of a group by operation, however, the existing distinct count is for all columns in the table, not for a particular column. In this article, I’ll show you a method you can use to get the distinct count of a particular column through the Group By transformation in Power Query component of Power BI.

Click through to learn how.

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Corruption and Secondary Databases

Published 2020-02-28 by Kevin Feasel

Paul Randal shares some wisdom on corruption:

We’ve had a few new clients come to use recently after experiencing corruption, and they’ve been worried about whether physical corruption can propagate to secondary databases (like an availability group secondary or log shipping secondary) through the mechanism used to maintain the secondary database in sync with the primary database. I explained how it’s very rare for that to happen, but sometimes it does, and not in a way you’d think. Read on…

I don’t even have to ask you to read on; Paul has even done that. And do read the comments as well.

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Preventing Query Timeouts with Power BI Incremental Refresh

Published 2020-02-28 by Kevin Feasel

Gilbert Quevauvilliers shows how to set the default timeout for a query against SQL Server from Power BI:

This was because on the first refresh it has to process all the data before it can incrementally refresh the dataset.

As per the documentation the default timeout for a SQL Server database is set to 10 minutes, and when I am processing a lot of data it can easily take longer than 10 minutes to return all the data.

Read on to see how you can change that if you need to.

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Goodbye, MCSE

Published 2020-02-28 by Kevin Feasel

John Deardurff helps break the news:

Major Announcement from Microsoft Learning today. As Microsoft continues to invest in role-based learning offerings, the Microsoft Certified Solutions Associate (MCSA), Microsoft Certified Solutions Developer (MCSD), and Microsoft Certified Solutions Expert (MCSE) certifications will be phased out with a final retirement date of June 30th, 2020. Find the entire list of retired certifications here.

On the plus side, at least people who hold the next iteration of the MCSE won’t be confused with people who worked with NT4 anymore…

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