T179105 was created to change default compression from deflate, to LZ4 (with a chunk size of 64KB). Some production in keyspaces in the new cluster have already been created using deflate, and should be reconfigured.
Those keyspaces (at the time of this writing):
commons_T_feed_aggregated commons_T_mobile__ng_lead commons_T_mobile__ng_remaining commons_T_page__restrictions commons_T_page__summary commons_T_parsoid__ng_data2pfX88WDfxDffCFHoTUDoy commons_T_parsoid__ng_html commons_T_parsoid__ng_section9wYKz1EvijuZtgPVP5t enwiki_T_feed_aggregated enwiki_T_mobile__ng_lead enwiki_T_mobile__ng_remaining enwiki_T_page__restrictions enwiki_T_parsoid__ng_data2pfX88WDfxDffCFHoTUDoy8 enwiki_T_parsoid__ng_html enwiki_T_parsoid__ng_section9wYKz1EvijuZtgPVP5tq local_group_globaldomain_T_mathoid_mml local_group_globaldomain_T_mathoid_svg others_T_feed_aggregated others_T_mobile__ng_lead others_T_mobile__ng_remaining others_T_page__restrictions others_T_page__summary others_T_parsoid__ng_data2pfX88WDfxDffCFHoTUDoy8 others_T_parsoid__ng_html others_T_parsoid__ng_section9wYKz1EvijuZtgPVP5tq wikipedia_T_feed_aggregated wikipedia_T_mobile__ng_lead wikipedia_T_mobile__ng_remaining wikipedia_T_page__restrictions wikipedia_T_page__summary wikipedia_T_parsoid__ng_data2pfX88WDfxDffCFHoTUD wikipedia_T_parsoid__ng_html wikipedia_T_parsoid__ng_section9wYKz1EvijuZtgPVP
An [[ https://github.com/eevans/cassandra-schema-nodejs/blob/master/bin/mkschema | mkschema ]] compatible set of ALTERs:
NOTE: This should be done outside any bootstraps happening as a result of T179422: Reshape RESTBase Cassandra clusters