Need to figure out the reason to cause polyglot in abnormal status.

From log, can notice a lot of SS dropping and adding and NULL exception throw from discoveryAMQ_push loop.

bd-test failure log:

http://bd-test.ncsa.illinois.edu/report.html?id=5a67397e27f528790c74e745

3 kinds of exceptions in log.

1.

 Unable to run the following server-side task: sun.net.httpserver.ServerImpl$Exchange@f1f6c01

2. 

BAD MESSAGE
[]
java.lang.NullPointerException

https://opensource.ncsa.illinois.edu/bitbucket/projects/POL/repos/polyglot/browse/src/main/java/edu/illinois/ncsa/isda/softwareserver/polyglot/PolyglotStewardAMQ.java#662

3. 

java.io.IOException: Stream closed
at java.io.BufferedInputStream.getBufIfOpen(BufferedInputStream.java:162)
at java.io.BufferedInputStream.read(BufferedInputStream.java:325)
at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:283)
at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:325)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:177)
at java.io.InputStreamReader.read(InputStreamReader.java:184)
at java.io.BufferedReader.fill(BufferedReader.java:154)
at java.io.BufferedReader.readLine(BufferedReader.java:317)
at java.io.BufferedReader.readLine(BufferedReader.java:382)
at edu.illinois.ncsa.isda.softwareserver.TimedProcess.handleProcessOutput(TimedProcess.java:121)
at edu.illinois.ncsa.isda.softwareserver.TimedProcess.run(TimedProcess.java:58)
at java.lang.Thread.run(Thread.java:748)
java.io.IOException: Stream closed
at java.io.BufferedInputStream.getBufIfOpen(BufferedInputStream.java:162)
at java.io.BufferedInputStream.read(BufferedInputStream.java:325)
at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:283)
at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:325)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:177)
at java.io.InputStreamReader.read(InputStreamReader.java:184)
at java.io.BufferedReader.fill(BufferedReader.java:154)
at java.io.BufferedReader.readLine(BufferedReader.java:317)
at java.io.BufferedReader.readLine(BufferedReader.java:382)
at edu.illinois.ncsa.isda.softwareserver.TimedProcess.handleProcessOutput(TimedProcess.java:121)
at edu.illinois.ncsa.isda.softwareserver.TimedProcess.run(TimedProcess.java:58)
at java.lang.Thread.run(Thread.java:748)