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https://issues.apache.org/jira/browse/ARROW-8861?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17616525#comment-17616525
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Joris Van den Bossche commented on ARROW-8861:
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Not an answer to you actual issue, but note that Plasma is deprecated (see
ARROW-17860 and the email thread that is linked there)
> [C++][Plasma] Memory not released until Plasma process is killed
> ----------------------------------------------------------------
>
> Key: ARROW-8861
> URL: https://issues.apache.org/jira/browse/ARROW-8861
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++ - Plasma
> Affects Versions: 0.16.0
> Environment: Singularity container (Ubuntu 18.04)
> Reporter: Chengxin Ma
> Priority: Minor
>
> Invoking the {{Delete(const ObjectID& object_id)}} method of a plasma client
> seems not really to free up the memory used by the object.
> To reproduce:
> 1. use {{htop}} (or other similar tools) to monitor memory usage;
> 2. start up the Plasma Object Store by {{plasma_store -m 1000000000 -s
> /tmp/plasma}};
> 3. use {{put.py}} to put an object into Plasma;
> 4. compile and run {{delete.cc}} ({{g++ delete.cc `pkg-config --cflags
> --libs arrow plasma` --std=c++11 -o delete}});
> 5. kill the {{plasma_store}} process.
> Memory usage drops at Step 5, rather than Step 4.
> How to free up the memory while keeping Plasma Object Store running?
> {{put.py}}:
> {code:java}
> from pyarrow import plasma
> if __name__ == "__main__":
> client = plasma.connect("/tmp/plasma")
> object_id = plasma.ObjectID(20 * b"a")
> object_size = 500000000
> buffer = memoryview(client.create(object_id, object_size))
> for i in range(500000000):
> buffer[i] = i % 128
> client.seal(object_id)
> client.disconnect()
> {code}
> {{delete.cc}}:
> {code:java}
> #include "arrow/util/logging.h"
> #include <plasma/client.h>
> using namespace plasma;
> int main(int argc, char **argv)
> {
> PlasmaClient client;
> ARROW_CHECK_OK(client.Connect("/tmp/plasma"));
> ObjectID object_id = ObjectID::from_binary("aaaaaaaaaaaaaaaaaaaa");
> client.Delete(object_id);
> ARROW_CHECK_OK(client.Disconnect());
> }
> {code}
>
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