fix: truncate should commit new meta to meta-server first #11319
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Summary
truncate should commit the new meta to meta-server first.
the principle should be:
publish the new meta first, let the effects of
truncate
be visible to all the subsequent txs (and parallel txs while committing), and purge the data later(in a best-effort manner) if thepurge
option is specified.also, please consider removing the
purge
option fromtruncate
, sinceCloses #issue