Steven Lacerda – Medium

Steven Lacerda

Troubleshooting Cassandra performance issues

Is the problem with reads or writes? Table specific or in general? Node specific? These are the types of questions you should ask yourself.

5 min readSep 9, 2022

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Troubleshooting Cassandra performance issues

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Steven Lacerda

Java Heap Space OOM on Eclipse MAT — How to fix

I had the hardest time increasing the memory for Eclipse MAT because everyone was pointing to an eclipse.ini file, but that file didn’t…

2 min readJan 27, 2022

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Java Heap Space OOM on Eclipse MAT — How to fix

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Steven Lacerda

How to hard set readahead in centos 7.4

What I found out is that since the startup scripts no longer run serially, they now run in parallel, adding startup parameters to rc.local…

1 min readOct 19, 2021

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Steven Lacerda

Native transport port and native transport port ssl configuration

Here’s the scenario that was a little non-intuitive to me:

1 min readSep 23, 2021

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Steven Lacerda

How to generate a thread dump in DSE DataStax

When high CPU is an issue, sometimes generating a thread dump is the only way to troubleshoot. You need to see which threads are consuming…

1 min readSep 21, 2021

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Steven Lacerda

Metrics Collector for Apache Cassandra (MCAC) filters to limit load times

The Java jvm for Apache Cassandra and DSE expose hundreds of thousands of different metrics. Trying to pull and store so many metrics is…

1 min readSep 21, 2021

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Steven Lacerda

BYOS (bring your own spark) connecting to Cassandra with TLS/SSL

In order to connect byos Spark to Cassandra using TLS/SSL your shell conf should look something like the following:

1 min readJun 3, 2021

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Steven Lacerda

CQLSH with TLS / SSL enabled

How to set up SSL with cqlsh:

1 min readNov 4, 2020

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Steven Lacerda

Why is my dormant cassandra dc seeing reads?

I have seen an issue where a DC that is not supposed to be receiving traffic is still showing reads. Why is that?

2 min readOct 27, 2020

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Client request image

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Steven Lacerda

Clearing up tombstones in cassandra

Tombstones can be created in many different ways, but the most common are:

1 min readOct 7, 2020

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Steven Lacerda

Steven Lacerda

Steve Lacerda is a software engineer specializing in web development. His favorite 80’s song is Let’s Put the X in Sex by Kiss.

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