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Fix a SIGSEGV in BackgroundFlush

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Summary:
This one wasn't easy to find :)

What happens is we go through all cfds on flush_queue_ and find no cfds to flush, *but* the cfd is set to the last CF we looped through and following code assumes we want it flushed.

BTW @sdong do you think we should also make BackgroundFlush() only check a single cfd for flushing instead of doing this `while (!flush_queue_.empty())`?

Test Plan: regression test no longer fails

Reviewers: sdong, rven, yhchiang

Reviewed By: yhchiang

Subscribers: sdong, dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D30591
This commit is contained in:
Igor Canadi 2014-12-21 00:23:28 -08:00
parent ade4034a9d
commit f8999fcf31
1 changed files with 5 additions and 4 deletions
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9
db/db_impl.cc
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@ -1801,17 +1801,18 @@ Status DBImpl::BackgroundFlush(bool* madeProgress, JobContext* job_context,
ColumnFamilyData* cfd = nullptr;
while (!flush_queue_.empty()) {
// This cfd is already referenced
cfd = PopFirstFromFlushQueue();
auto first_cfd = PopFirstFromFlushQueue();
if (cfd->IsDropped() || !cfd->imm()->IsFlushPending()) {
if (first_cfd->IsDropped() || !first_cfd->imm()->IsFlushPending()) {
// can't flush this CF, try next one
if (cfd->Unref()) {
delete cfd;
if (first_cfd->Unref()) {
delete first_cfd;
}
continue;
}
// found a flush!
cfd = first_cfd;
break;
}