[jira] [Created] (KUDU-2836) Wrong memory used detection

["Yingchun Lai (JIRA)" <ji...@apache.org>]

Yingchun Lai created KUDU-2836:
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             Summary: Wrong memory used detection
                 Key: KUDU-2836
                 URL: https://issues.apache.org/jira/browse/KUDU-2836
             Project: Kudu
          Issue Type: Improvement
          Components: tserver
            Reporter: Yingchun Lai
            Assignee: Yingchun Lai


On one of my tserver, memory used about 95%, "top" result like:
{code:java}
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
8359 work 20 0 0.326t 0.116t 81780 S 727.9 94.6 230228:10 kudu_tablet_ser
{code}
That is kudu_tablet_server process used about 116G memory. I login to the server to check any free memory MM operations are work correctly. Unfortunatly, the memory pressure detect function(process_memory::UnderMemoryPressure) doesn't report it's under pressure, because the tcmalloc function GetNumericProperty(const char* property, size_t* value) with parameter "generic.current_allocated_bytes" doesn't return the memory as the memory use reported by the OS.

https://gperftools.github.io/gperftools/tcmalloc.html
{quote}
|{{generic.current_allocated_bytes}}|Number of bytes used by the application. This will not typically match the memory use reported by the OS, because it does not include TCMalloc overhead or memory fragmentation.|
{quote}



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