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<a href="https://github.com/dgraph-io/badger/commit/<a class=hub.com/dgraph-io/badger/commit/bcf8b972e5a27ed2406e3061902eff5cec4966ab">bcf8b972e<a href="https://github.com/dgraph-io/badger/commit/bcf8b972e5a27ed2406e3061902eff5cec4966ab">&quot;&gt;Flush vlog buffer if it grows beyond threshold (#1067)

The OOM happens when we trying to flush write batch.
When we insert data into a transaction, we calculate the size
of the transaction by using the following function
https://github.com/dgraph-io/badger/blob/&lt;/a&gt;&lt;a class=&quot;double-link&quot; href=&quot;https://github.com/dgraph-io/badger/commit/&lt;a class=&quot;double-link&quot; href=&quot;https://git">&lt;a class=</a>hub.com/dgraph-io/badger/commit/<a class=hub.com/dgraph-io/badger/commit/b20e8b6e8b742236f4a88f7c0cead2d64118a416">b20e8b6e8">b20e8b6e8</a><a href="https://github.com/dgraph-io/badger/commit/bcf8b972e5a27ed2406e3061902eff5cec4966ab">/txn.go#L295-L300
which uses `estimateSize` function
https://github.com/dgraph-io/badger/blob/b20e8b6e8b742236f4a88f7c0cead2d64118a416/structs.go#L134-L139

For a key size of 4 and a value size of 1 MB, the `estimateSize`
function would return 4 + 12 + 2 = 18 byte which is valid in case
of SSTs but not for a vlog file. The entry size for vlog would be
around 1 MB and when all such entries are packed into a single
request for vlog, the bytes.buffer in vlog crashes with OOM error.
This commit fixes it.</a>

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