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Enable WAL for blob index

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Summary:
Enabled WAL, during GC, for blob index which is stored on regular RocksDB.
Closes https://github.com/facebook/rocksdb/pull/2975

Differential Revision: D5997384

Pulled By: sagar0

fbshipit-source-id: b76c1487d8b5be0e36c55e8d77ffe3d37d63d85b
This commit is contained in:
Sagar Vemuri 2017-10-06 10:53:46 -07:00 committed by Facebook Github Bot
parent d1b74b0c82
commit da29eba43b
1 changed files with 0 additions and 10 deletions
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10
utilities/blob_db/blob_db_impl.cc
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@ -1738,16 +1738,6 @@ Status BlobDBImpl::GCFileAndUpdateLSM(const std::shared_ptr<BlobFile>& bfptr,
static const WriteOptions kGarbageCollectionWriteOptions = []() {
WriteOptions write_options;
// TODO(yiwu): Disable WAL for garbage colection to make it compatible with
// use cases that don't use WAL. However without WAL there are at least
// two issues with crash:
// 1. If a key is dropped from blob file (e.g. due to TTL), right before a
// crash, the key may still presents in LSM after restart.
// 2. If a key is relocated to another blob file, right before a crash,
// after restart the new offset may be lost with the old offset pointing
// to the removed blob file.
// We need to have better recovery mechanism to address these issues.
write_options.disableWAL = true;
// It is ok to ignore column families that were dropped.
write_options.ignore_missing_column_families = true;
return write_options;