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Print smallest and largest seqno in Version::DebugString() for more details (#5231)

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Summary:
In some cases, we want to known the smallest and largest sequence numbers of sstable files, to help us get more details.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5231

Differential Revision: D15038087

Pulled By: siying

fbshipit-source-id: c473c1ca07b53efe2f1884fa1ecdc8686f455ed8
This commit is contained in:
qinzuoyan 2019-04-23 11:14:41 -07:00 committed by Facebook Github Bot
parent 990b2f4cb3
commit a7d103198e
1 changed files with 8 additions and 3 deletions
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11
db/version_set.cc
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@ -3235,11 +3235,11 @@ std::string Version::DebugString(bool hex, bool print_stats) const {
for (int level = 0; level < storage_info_.num_levels_; level++) {
// E.g.,
// --- level 1 ---
// 17:123['a' .. 'd']
// 20:43['e' .. 'g']
// 17:123[1 .. 124]['a' .. 'd']
// 20:43[124 .. 128]['e' .. 'g']
//
// if print_stats=true:
// 17:123['a' .. 'd'](4096)
// 17:123[1 .. 124]['a' .. 'd'](4096)
r.append("--- level ");
AppendNumberTo(&r, level);
r.append(" --- version# ");
@ -3252,6 +3252,11 @@ std::string Version::DebugString(bool hex, bool print_stats) const {
r.push_back(':');
AppendNumberTo(&r, files[i]->fd.GetFileSize());
r.append("[");
AppendNumberTo(&r, files[i]->fd.smallest_seqno);
r.append(" .. ");
AppendNumberTo(&r, files[i]->fd.largest_seqno);
r.append("]");
r.append("[");
r.append(files[i]->smallest.DebugString(hex));
r.append(" .. ");
r.append(files[i]->largest.DebugString(hex));