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Initialize threads later in constructor 

Summary: This addresses a test failure where an exception occured in the constructor's call to CreateDirIfMissing(). The existence of unjoined threads prevented this exception from propogating properly. See http://stackoverflow.com/questions/7381757/c-terminate-called-without-an-active-exception

Test Plan: Re-run tests from task #7626266

Reviewers: sdong, anthony, igor

Reviewed By: igor

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D41313
This commit is contained in:
Aaron Feldman 2015-07-07 10:49:16 -07:00
parent 58d7ab3c68
commit e12b403991
1 changed files with 21 additions and 20 deletions
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41
utilities/backupable/backupable_db.cc
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@ -442,26 +442,6 @@ BackupEngineImpl::BackupEngineImpl(Env* db_env,
copy_file_buffer_size_(kDefaultCopyFileBufferSize),
read_only_(read_only) {
// set up threads perform copies from files_to_copy_ in the background
for (int t = 0; t < options_.max_background_operations; t++) {
threads_.emplace_back([&]() {
CopyWorkItem work_item;
while (files_to_copy_.read(work_item)) {
CopyResult result;
result.status = CopyFile(work_item.src_path,
work_item.dst_path,
work_item.src_env,
work_item.dst_env,
work_item.sync,
work_item.rate_limiter,
&result.size,
&result.checksum_value,
work_item.size_limit);
work_item.result.set_value(std::move(result));
}
});
}
if (read_only_) {
Log(options_.info_log, "Starting read_only backup engine");
}
@ -581,6 +561,27 @@ BackupEngineImpl::BackupEngineImpl(Env* db_env,
if (!read_only_) {
PutLatestBackupFileContents(latest_backup_id_); // Ignore errors
}
// set up threads perform copies from files_to_copy_ in the background
for (int t = 0; t < options_.max_background_operations; t++) {
threads_.emplace_back([&]() {
CopyWorkItem work_item;
while (files_to_copy_.read(work_item)) {
CopyResult result;
result.status = CopyFile(work_item.src_path,
work_item.dst_path,
work_item.src_env,
work_item.dst_env,
work_item.sync,
work_item.rate_limiter,
&result.size,
&result.checksum_value,
work_item.size_limit);
work_item.result.set_value(std::move(result));
}
});
}
Log(options_.info_log, "Initialized BackupEngine");
}