I am running 7 nodes cassandra(v1.0.2) cluster. I am putting 20K rows per sec to the cluster. This cluster has 1 KS, 3CFs. Each CF has 4-5 secondary indices.
After I'v run for 1 week, nodes use swap memory. I changed disk-access-mode to index_only or standard. I got strange memory results. > using mmap: > VIRT: 566g RES: 36g SHR:12g > standard disk access mode > VIRT:24.7g RES: 24g SHR:68m I allocated 24g memory for JVM heap. I have some questions about mmap. It is easy to analyze standard disk access mode's memory result. I know cassandra use huge virtual memory for mmap I/O and each mmaped addresses are mapped to indexed file not swap memory. But, I don't understand why cassandra use shared memory, if using mmap I/O. Are there some documents that explain this situation? -- Jaesung Lee Sent with Sparrow (http://www.sparrowmailapp.com/?sig)
