Gary Day
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Articles
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Quiesce a node when all nodes hold a copy of all data
ContextIf you are running your cluster with replication-factor equal to the number of nodes in your cluster (such that all nodes hold a copy of all data), and your client policy allows reading from...
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Disabling transparent huge pages (THP) for Aerospike
ContextBackgroundThe physical memory in linux is not directly mapped to virtual memory. This is done in ‘pages’. A single page of virtual memory that gets allocated in physical memory is 4KB in siz...
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Why do I get "TLS verify result: unable to get local issuer certificate" error when using ca-path for my CA certs?
DetailThe error "TLS verify result: unable to get local issuer certificate" means that the Aerospike Server has been unable to verify the provided certificate against a CA certificate.AnswerThere a...
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Why do I get AEROSPIKE_ERR_CLUSTER_CHANGE when querying or scanning a namespace?
DetailWhen I query or scan a namespace, why does aql return “Error: (7) AEROSPIKE_ERR_CLUSTER_CHANGE”? I get the same error when I attempt to run the operation from C or Java client. In Java, the e...
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How much memory does Aerospike use?
DetailIn addition any Primary Index or Data that you have configured to be stored in memory, Aerospike also requires additional memory for the Aerospike (asd) process itself, plus various queues an...
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What do the various parts of an Aerospike Java Client error messages mean?
DetailKB INCOMPLETE - DO NOT PUBLISH When subscribed to Aerospike Client logging, you may see an error message which has been generated as a result of the client having some kind of issue perform...
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Should I leave microbenchmarks permanently enabled?
DetailBy default Aerospike has some basic benchmarks enabled which can be used to give a high level view of what is happening on a node at a given point in time. These benchmark stats are written t...
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Why is XDR lag high during an XDR rewind?
DetailDuring an XDR rewind, XDR lag can report a really high value, often years. Why does this occur?AnswerAerospike has an internally tracked value called Last Ship Time (LST), which is is set to ...
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What connections do Aerospike Clients make to Aerospike Server nodes?
DetailAn Aerospike Client will open multiple connections to each node in an Aerospike cluster. What are these connections used for and how can the number of connections vary based on Client load an...
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How does Aerospike calculate system memory usage?
DetailAerospike has 2 configuration items that check system memory usage: stop-writes-sys-memory-pctevict-sys-memory-pct (Server versions 7.0-7.2 only) What is included when checking memory usage a...