[KUDU-1748] /inflight_query_ids returns "\n" when no queries are running

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Invalid
• Affects Version/s: 1.0.0
• Fix Version/s: n/a
• Component/s: impala
• Assignee: Unassigned
• Reporter: Shravan Pabba
• Created: 15/Nov/16 16:59
• Updated: 16/Nov/16 03:03
• Resolved: 16/Nov/16 03:03

Description

Cloudera Manager Query Monitoring Status Check Keeps failing for all the impala daemons for Impala_kudu service.

Cloudera support team did the analysis and here is more information,

From the collected tcpdump, we see that the result returned by Impala daemon for the "inflight_query_ids" check made by cloudera-scm-agent is of length 1 character.

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GET /inflight_query_ids HTTP/1.1
Accept-Encoding: identity
Host: ebdp-avdc-d324p.sys.comcast.net:25000
Connection: close
User-Agent: Python-urllib/2.6

HTTP/1.1 200 OK
Content-Type: text/plain
Content-Length: 1
X-Frame-Options: DENY

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Hence 'inflight_query_ids' web call is returning '\n' if there are no queries in flight (as visible from capture), instead of the expected empty string. This causes Cloudera Manager agent query monitor call to fail.

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Could not obtain runtime profile: Query id 0:0 not found.
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Need the inflight_query_ids to return empty string instead of "\n"