hortonworks data platform - Nifi flow deleted when restarting sandbox VM -

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i upgraded nifi 0.6.0, version comes hortonworks hdf, latest version 0.7.0. followed upgrade steps mentioned here. https://cwiki.apache.org/confluence/display/nifi/upgrading+nifi

however, whenever restart hdp vm, nifi flow gone, , have redo it. noticed file size in ../configuration_resources/flow.xml.gz becomes 0 everytime restart vm. did miss on upgrade?


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