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[CF] Dont reuse dropped column family IDs

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Summary:
Column family IDs should be unique, even if column family is dropped. To achieve this, we save max column family in manifest.

Note that the diff is still not ready. I'm only using differential to move the patch to my Mac machine.

Test Plan: added a test to column_family_test

Reviewers: dhruba, haobo

CC: leveldb

Differential Revision: https://reviews.facebook.net/D16581
This commit is contained in:
Igor Canadi
2014-03-05 12:13:44 -08:00
parent e21d5b8bbc
commit 9625acbf70
7 changed files with 94 additions and 10 deletions
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8
db/version_edit.h
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@@ -70,6 +70,10 @@ class VersionEdit {
has_last_sequence_ = true;
last_sequence_ = seq;
}
void SetMaxColumnFamily(uint32_t max_column_family) {
has_max_column_family_ = true;
max_column_family_ = max_column_family;
}
// Add the specified file at the specified number.
// REQUIRES: This version has not been saved (see VersionSet::SaveTo)
@@ -143,15 +147,17 @@ class VersionEdit {
uint64_t log_number_;
uint64_t prev_log_number_;
uint64_t next_file_number_;
uint32_t max_column_family_;
SequenceNumber last_sequence_;
bool has_comparator_;
bool has_log_number_;
bool has_prev_log_number_;
bool has_next_file_number_;
bool has_last_sequence_;
bool has_max_column_family_;
DeletedFileSet deleted_files_;
std::vector< std::pair<int, FileMetaData> > new_files_;
std::vector<std::pair<int, FileMetaData>> new_files_;
// Each version edit record should have column_family_id set
// If it's not set, it is default (0)