I found a solution... but it's just a quick hack, not an appropriate fix I think.
modify hue/desktop/core/ext-py/sasl-0.1.1/sasl/saslwrapper.cpp to increase maxBufSize. build it with "python setup.py build" and get a new _saslwrapper.so replace hue/build/env/lib/python2.6/site-packages/sasl-0.1.1-py2.6-linux-x86_64.egg/_saslwrapper.so with it restart Hue. Detail of step 1 and 2 below. Step 1. In hue/desktop/core/ext-py/sasl-0.1.1/sasl/saslwrapper.cpp you can find a line "ClientImpl() : conn(0), cbIndex(0), maxBufSize(65535), minSsf(0), maxSsf(65535), externalSsf(0), secret(0) {}" around line 35, so modified maxBufSize to larger value. Step 2. In hue/desktop/core/ext-py/sasl-0.1.1, execute "python setup.py build", so you've got _saslwrapper.so in hue/desktop/core/ext-py/sasl-0.1.1/uild/lib.linux-x86_64-2.6/_saslwrapper.so
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