delay TUID assignment less
we can't delay TUID assignment until after starting propagation if we
want to provide both safety and performance.
amends a0961d65
.
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parent
04e225c7ce
commit
2b797fac61
32
src/sync.c
32
src/sync.c
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@ -272,6 +272,17 @@ assign_uid( sync_vars_t *svars, sync_rec_t *srec, int t, uint uid )
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assign_uid( svars, srec, t, nuid ); \
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} while (0)
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static void
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assign_tuid( sync_vars_t *svars, sync_rec_t *srec )
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{
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for (uint i = 0; i < TUIDL; i++) {
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uchar c = arc4_getbyte() & 0x3f;
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srec->tuid[i] = (char)(c < 26 ? c + 'A' : c < 52 ? c + 'a' - 26 :
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c < 62 ? c + '0' - 52 : c == 62 ? '+' : '/');
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}
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JLOG( "# %u %u %." stringify(TUIDL) "s", (srec->uid[F], srec->uid[N], srec->tuid), "new TUID" );
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}
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static void
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match_tuids( sync_vars_t *svars, int t, message_t *msgs )
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{
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@ -2022,16 +2033,28 @@ box_loaded( int sts, message_t *msgs, int total_msgs, int recent_msgs, void *aux
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}
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debug( "propagating new messages\n" );
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if (UseFSync && svars->jfp)
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fdatasync( fileno( svars->jfp ) );
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for (t = 0; t < 2; t++) {
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if (any_new[t]) {
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// fsync'ing the UIDNEXT bump is not strictly necessary, but advantageous.
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svars->finduid[t] = svars->drv[t]->get_uidnext( svars->ctx[t] );
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JLOG( "F %d %u", (t, svars->finduid[t]), "save UIDNEXT of %s", str_fn[t] );
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svars->new_msgs[t] = svars->msgs[1-t];
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} else {
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svars->state[t] |= ST_SENT_NEW;
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}
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}
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if (any_new[F] | any_new[N]) {
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// TUID assignment needs to be fsync'd, as otherwise a system crash may
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// lead to the newly propagated messages becoming duplicated.
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// Of course, we could assign each TUID only after fetching the message
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// and fsync it separately, but that would be horribly inefficient.
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for (srec = svars->srecs; srec; srec = srec->next)
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if (srec->status & S_PENDING)
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assign_tuid( svars, srec );
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if (UseFSync && svars->jfp)
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fdatasync( fileno( svars->jfp ) );
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}
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for (t = 0; t < 2; t++) {
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msgs_copied( svars, t );
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if (check_cancel( svars ))
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goto out;
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@ -2097,11 +2120,6 @@ msgs_copied( sync_vars_t *svars, int t )
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svars->new_msgs[t] = tmsg;
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goto out;
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}
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for (uint i = 0; i < TUIDL; i++) {
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uchar c = arc4_getbyte() & 0x3f;
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srec->tuid[i] = (char)(c < 26 ? c + 'A' : c < 52 ? c + 'a' - 26 : c < 62 ? c + '0' - 52 : c == 62 ? '+' : '/');
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}
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JLOG( "# %u %u %." stringify(TUIDL) "s", (srec->uid[F], srec->uid[N], srec->tuid), "%sing message", str_hl[t] );
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new_total[t]++;
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stats();
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svars->new_pending[t]++;
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