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PODisk-backed array in Go
 

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  1. PODisk-backed array in Go
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    <p>How can I create a disk-based delayed queue in Go?</p> <p>I am writing a Go program to take certain actions on data after certain time intervals. Here is a stripped down version.</p> <pre><code>func IncomingJob (data MyStruct) { //Run immediately dosomething(&amp;data, 1) time.Sleep(5 * time.Minute) //Run after 5 minutes has passed from initial arrival dosomething(&amp;data, 2) time.Sleep(5 * time.Minute) //Run after 10 minutes has passed from initial arrival dosomething(&amp;data, 3) time.Sleep(50 * time.Minute) //Run after 60 minutes has passed from initial arrival dosomething(&amp;data, 4) } </code></pre> <p>This func would be initialized as a goroutinue.</p> <pre><code>go IncomingJob(data) </code></pre> <p>The problem I am having is that each instance of IncomingJob runs for 60 minutes and the <code>MyStruct</code> object stays in memory for that duration. The total memory usage is pretty huge. If I want to support 1 million runs per hour, that means at any given time, there are 1 million <code>MyStruct</code> objects in memory waiting, doing nothing. I can use <code>time.AfterFunc</code> for this as well, but that doesn't change anything with respect to memory usage.</p> <p>Is there some disk backed FIFO queue/buffer implementation in Go? That way I could have 3 queues (for different intervals) and poll it and sleep until its the correct time for the polled data to be reprocessed. This way I would lose some CPU cycles in serialization, add I/O latency to an otherwise in-memory application but save a massive amount of memory. </p> <p>Update: <code>time.AfterFunc</code> uses a lot less memory.</p> <pre><code>func IncomingJob (data MyStruct) { //Run immediately dosomething(&amp;data, 1) time.AfterFunc(5 * time.Minute, func() { //Run after 5 minutes has passed from initial arrival dosomething(&amp;data, 2) time.AfterFunc(5 * time.Minute, func() { //Run after 10 minutes has passed from initial arrival dosomething(&amp;data, 3) }) time.AfterFunc(50 * time.Minute, func() { //Run after 50 minutes has passed from initial arrival dosomething(&amp;data, 4) }) }) } </code></pre>
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