I solved my problem by follow the steps in this link: https://community.cloudera.com/t5/Support-Questions/HDP-Upgrade-blocked-by-another-INTERNAL-REQUEST/m-p/200127 jsensharma Super Mentor Created 02-02-2018 12:58 PM @Toky Raobelina Please check the "clusters" table and if you find any previous "upgrade_id" there then please try setting that to NULL (this null should be your Database specific NULL value) and then restart ambari server. UPDATE clusters SET upgrade_id=NULL;
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