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Do not snappy encode if record is too large (#8790)

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Snappy cannot encode records larger than ~3.7 GB and will panic if an
encoding is attempted. Check to make sure that the record is smaller
than this before encoding.

In the future, we could improve this behavior to still compress large
records (or break them up into smaller records), but this avoids the
panic for users with very large single scrape targets.

Signed-off-by: Chris Marchbanks <csmarchbanks@gmail.com>
This commit is contained in:
Chris Marchbanks 2021-05-06 12:56:45 -06:00 committed by GitHub
parent b50f9c1c84
commit 7c7dafc321
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1 changed files with 4 additions and 1 deletions
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5
tsdb/wal/wal.go
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@ -616,7 +616,10 @@ func (w *WAL) log(rec []byte, final bool) error {
// Compress the record before calculating if a new segment is needed.
compressed := false
if w.compress && len(rec) > 0 {
if w.compress &&
len(rec) > 0 &&
// If MaxEncodedLen is less than 0 the record is too large to be compressed.
snappy.MaxEncodedLen(len(rec)) >= 0 {
// The snappy library uses `len` to calculate if we need a new buffer.
// In order to allocate as few buffers as possible make the length
// equal to the capacity.