Artem Koval created THRIFT-2682:
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Summary: TThreadedServer leaks per-thread memory
Key: THRIFT-2682
URL: https://issues.apache.org/jira/browse/THRIFT-2682
Project: Thrift
Issue Type: Bug
Components: C++ - Library
Affects Versions: 0.9.1
Environment: RHEL 6.5
Reporter: Artem Koval
Priority: Critical
We are using Thrift 0.9.1 in Linux, both client and server are written in C++.
TThreadedServer is used to process requests involving large (up to 1MB) binary
parameters.
Usage pattern is like this: the client establishes a UNIX socket connection,
makes some interface calls and then disconnects.
We noticed that the memory footprint of the server process increases over time.
Valgrind inspection showed that despite the server threads have long been
shutdown, their data allocated in TThreadedServer::serve() hasn't been freed
and shows up as "definitely lost".
This leak, although significant, is not critical by itself. But per-thread data
includes a TBinaryProtocol object, which in turn holds a "string buffer" used
to serialize binary parameters. These string buffers are quite large in our
case, leading to overall memory leakage being unacceptably high.
As a workaround, we will for now turn to TNonblockingServer, which uses
persistent threads. However, a memory leak is still a very serious problem, and
it should be fixed.
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