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This patch adds information about blacklisting decisions to the /backends webui endpoint. For the JSON, it adds an 'is_blacklisted' field to all backends, and for and backends where 'is_blacklisted' is true it adds a 'blacklist_cause' field indicating the error status that led to the backend getting blacklisted and an 'blacklist_time_remaining' field indiciating how much longer the backend will remain on the blacklist. It also adds counts for the number of blacklisted and quiescing backends, if any, and the number of active (i.e. all other) backends. For display, in order to prevent the table of backend information from having too many columns (prior to this patch it already had 12), it separates blacklisted, quiescing, and active backends into three separate table, with the blacklisted and quiescing tables only getting displayed if there are any such backends. Additionally, tooltips are added next to the headers for the blacklisted and quiescing tables that provide a brief explanation of what it means for a backend to appear on there lists. Using separate tables also facilitates having state-specific columns - the blacklisted table displays columns for the blacklist cause and time remaining. Future work could consider adding columns to the quiescing table, such as time until the grace period and deadline expires. Testing: - Manually ran various quiescing/blacklisting scenarios and confirmed the /backends page displays as expected. - Added cases to test_web_pages (to verify the new fields when nothing is blacklisted) and test_blacklist. Change-Id: Ia0c309315b142a50be102dcb516b36ec6cb3cf47 Reviewed-on: http://gerrit.cloudera.org:8080/15178 Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
2 lines
250 B
Plaintext
2 lines
250 B
Plaintext
Quiescing backends are in the process of gracefully shutting down. No more queries will be scheduled on them, and they will shut down once the grace period has passed and either all running queries have completed or the shutdown deadline is reached.
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