Lucien
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Activity overview
Latest activity by Lucien-
Lucien created an article, Why is CPU being used by kworker and kswapd0 causing latencies?
Problem DescriptionWhen an Aerospike system is experiencing latency the following symptoms may be observed: high disk load observed via the uptime commandtop output showing CPU utilization by eithe...
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Lucien created an article, Why is asd process blocked for more than 120 Seconds?
Problem DescriptionCustomer is finding "INFO: task NAME:PID blocked for more than 120 seconds" in /var/log/messages or dmesg. This indicates that the process requested a blocking resource such as a...
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Lucien created an article, How to zeroize multiple storage devices simultaneously?
ContextCustomer may need to dd (erase) multiple disk on a server. This can occur when initializing a system configured for multiple storage-engine devices (ssd, nvmes, raw disk partitions) .Method...
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Lucien created an article, How to completely remove and clean-up an Aerospike server installation?
ContextThe following describes the procedure for the proper removal or uninstall followed by a clean-up of an Aerospike installation. This document will give an overview of the packages, files, and...
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Lucien created an article, How to Disable firewalld in Centos 7
ContextWe have found, in several situations, that there was something new in CentOS/RHEL 7 that was blocking ports. The firewall on Redhat 7 Linux system is enabled by default. It may have to be di...
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Lucien created an article, System running out of file descriptors
Problem DescriptionA node has ran out of file descriptors and is getting the following warnings: Nov 14 2017 00:54:57 GMT: WARNING (demarshal): (thr_demarshal.c:454) Hit OS file descriptor limit (...
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Lucien created an article, How to modify a record ttl on a non-expirable record using a UDF?
ContextObjects can have a ttl (time to live) set which means that they will expire (deleted) when after the ttl is reached. Objects can also never expire if their ttl is set to -1 (will cause serve...
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Lucien created an article, Why do I get "Invalid namespace error" ?
Problem DescriptionClient got "Invalid namespace" error exception even though the namespace is correctly specified. Caused by: com.aerospike.client.AerospikeException: Invalid namespace: bar at co...
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Lucien created an article, Why do I see latency on writes during migrations?
Problem DescriptionIncrease in write latency are only observed during migrations.ExplanationThere will be increased write load during migrations, which may result in increased write latency. This i...
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Lucien created an article, How to split 2 accidentally merged clusters?
Problem DescriptionTwo clusters configured for mesh heartbeats may have accidentally joined into one if the IP of a node in one cluster ends up on the list of seed nodes of the other and both clus...