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Issue 1: When query is cancelled via CTRL-C while being executed in Impala-shell then an exception is thrown from Impala backend saying 'Invalid query handle'. This is because one ImpalaClient was making RPC's while another ImpalaClient cancelled the query on the backend. As a result RPC handlers in ImpalaServer try to access a ClientRequestState that had been cleared from the backend. The issue is confidently reproducable both in wait_to_finish and in fetch states of the query. As a solution the query cancellation is indicated to ImpalaClient via a bool flag. Once a cancellation originated exception reaches Impala shell this flag is checked to decide whether to suppress the error or not. Issue 2: Every time a query was cancelled a 'use db' command was issued automatically. This happened to historical reasons but is not needed anymore (see Jira for more details). Change-Id: I6cefaf1dae78baae238289816a7cb9d210fb38e2 Reviewed-on: http://gerrit.cloudera.org:8080/8549 Reviewed-by: Tim Armstrong <tarmstrong@cloudera.com> Tested-by: Impala Public Jenkins