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Commitb2603f1

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Document concurrent indexes waiting on each other
Because regular CREATE INDEX commands are independent, and there's nological data dependency, it's not immediately obvious that transactionsheld by concurrent index builds on one table will block the second phaseof concurrent index creation on an unrelated table, so document thiscaveat.Backpatch this all the way back. In branch master, mention that onlysome indexes are involved.Author: James Coleman <jtc331@gmail.com>Reviewed-by: David Johnston <david.g.johnston@gmail.com>Discussion:https://postgr.es/m/CAAaqYe994=PUrn8CJZ4UEo_S-FfRr_3ogERyhtdgHAb2WG_Ufg@mail.gmail.com
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‎doc/src/sgml/ref/create_index.sgml

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@@ -564,7 +564,8 @@ CREATE [ UNIQUE ] INDEX [ CONCURRENTLY ] [ [ IF NOT EXISTS ] <replaceable class=
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wait for existing transactions that have modified the table to terminate.
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After the second scan, the index build must wait for any transactions
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that have a snapshot (see <xref linkend="mvcc"/>) predating the second
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scan to terminate. Then finally the index can be marked ready for use,
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scan to terminate, including transactions used by any phase of concurrent
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index builds on other tables. Then finally the index can be marked ready for use,
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and the <command>CREATE INDEX</command> command terminates.
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Even then, however, the index may not be immediately usable for queries:
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in the worst case, it cannot be used as long as transactions exist that

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