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Fix a map lookup that may throw exception. (#4098)

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Summary:
`std::map::at(key)` throws std::out_of_range if key does not exist. Current
code does not handle this. Although this case is unlikely, I feel it's safe to
use `std::map::find`.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4098

Differential Revision: D8753865

Pulled By: riversand963

fbshipit-source-id: 9a9ba43badb0fb5e0d24cd87903931fd12f3f8ec
This commit is contained in:
Yanqin Jin 2018-07-06 16:07:29 -07:00 committed by Facebook Github Bot
parent d4d9fe8e57
commit db7ae0a485
1 changed files with 5 additions and 3 deletions
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8
db/external_sst_file_ingestion_job.cc
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@ -336,12 +336,14 @@ Status ExternalSstFileIngestionJob::GetIngestedFileInfo(
// Set the global sequence number
file_to_ingest->original_seqno = DecodeFixed64(seqno_iter->second.c_str());
file_to_ingest->global_seqno_offset = props->properties_offsets.at(
auto offsets_iter = props->properties_offsets.find(
ExternalSstFilePropertyNames::kGlobalSeqno);
if (file_to_ingest->global_seqno_offset == 0) {
if (offsets_iter == props->properties_offsets.end() ||
offsets_iter->second == 0) {
file_to_ingest->global_seqno_offset = 0;
return Status::Corruption("Was not able to find file global seqno field");
}
file_to_ingest->global_seqno_offset = offsets_iter->second;
} else if (file_to_ingest->version == 1) {
// SST file V1 should not have global seqno field
assert(seqno_iter == uprops.end());