[jira] [Created] (FLUME-2984) Default maxReadBufferBytes might cause OOM and cause thrift source exit

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

Laxman created FLUME-2984:
-----------------------------

             Summary: Default maxReadBufferBytes might cause OOM and cause thrift source exit
                 Key: FLUME-2984
                 URL: https://issues.apache.org/jira/browse/FLUME-2984
             Project: Flume
          Issue Type: Bug
          Components: Sinks+Sources
    Affects Versions: v1.6.0
            Reporter: Laxman


Our usecase has multi agent flow and we are achieving this with thrift source and thrift sink combination. When there is a surge in incoming traffic downstream agent having thrift source is running out of memory. On further investigation of thrift transport/server code and scribe source found that we may need to fix the thrift transport's maxReadBufferBytes. Similar issue has been fixed in ScribeSource as part of FLUME-2404 by making this buffer configurable and capping it to a 16MB if not configured.

*thrift code (org.apache.thrift.server.AbstractNonblockingServer)*
{code}
  public abstract static class AbstractNonblockingServerArgs<T extends AbstractNonblockingServer.AbstractNonblockingServerArgs<T>> extends AbstractServerArgs<T> {
    public long maxReadBufferBytes = 9223372036854775807L;

    public AbstractNonblockingServerArgs(TNonblockingServerTransport transport) {
      super(transport);
      this.transportFactory(new Factory());
    }
  }
{code}
*stacktrace*
{noformat}
31 Aug 2016 12:52:24 ERROR [Thread-12] - run() exiting due to uncaught error
java.lang.OutOfMemoryError: unable to create new native thread
        at java.lang.Thread.start0(Native Method)
        at java.lang.Thread.start(Thread.java:714)
        at java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:950)
        at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1357)
        at org.apache.thrift.server.TThreadedSelectorServer.requestInvoke(TThreadedSelectorServer.java:310)
        at org.apache.thrift.server.AbstractNonblockingServer$AbstractSelectThread.handleRead(AbstractNonblockingServer.java:209)
        at org.apache.thrift.server.TThreadedSelectorServer$SelectorThread.select(TThreadedSelectorServer.java:576)
        at org.apache.thrift.server.TThreadedSelectorServer$SelectorThread.run(TThreadedSelectorServer.java:536)
{noformat}




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