[ceph-users] mimic: 3/4 OSDs crashed on "bluefs enospc"

Sergey Malinin hell at newmail.com
Mon Oct 1 05:28:23 PDT 2018


These are LVM bluestore NVMe SSDs created with "ceph-volume --lvm prepare --bluestore /dev/nvme0n1p3" i.e. without specifying wal/db devices.
OSDs were created with bluestore_min_alloc_size_ssd=4096, another modified setting is bluestore_cache_kv_max=1073741824

DB/block usage collected by prometheus module for 3 failed and 1 survived OSDs:

ceph_bluefs_db_total_bytes{ceph_daemon="osd.0"} 65493008384.0
ceph_bluefs_db_total_bytes{ceph_daemon="osd.1"} 49013587968.0
ceph_bluefs_db_total_bytes{ceph_daemon="osd.2"} 76834406400.0 --> this one has survived
ceph_bluefs_db_total_bytes{ceph_daemon="osd.3"} 63726157824.0

ceph_bluefs_db_used_bytes{ceph_daemon="osd.0"} 65217232896.0
ceph_bluefs_db_used_bytes{ceph_daemon="osd.1"} 48944381952.0
ceph_bluefs_db_used_bytes{ceph_daemon="osd.2"} 68093476864.0
ceph_bluefs_db_used_bytes{ceph_daemon="osd.3"} 63632834560.0

ceph_osd_stat_bytes{ceph_daemon="osd.0"} 471305551872.0
ceph_osd_stat_bytes{ceph_daemon="osd.1"} 471305551872.0
ceph_osd_stat_bytes{ceph_daemon="osd.2"} 471305551872.0
ceph_osd_stat_bytes{ceph_daemon="osd.3"} 471305551872.0

ceph_osd_stat_bytes_used{ceph_daemon="osd.0"} 222328213504.0
ceph_osd_stat_bytes_used{ceph_daemon="osd.1"} 214472544256.0
ceph_osd_stat_bytes_used{ceph_daemon="osd.2"} 163603996672.0
ceph_osd_stat_bytes_used{ceph_daemon="osd.3"} 212806815744.0


First crashed OSD was doing DB compaction, others crashed shortly after during backfilling. Workload was "ceph-data-scan scan_inodes" filling metadata pool located on these OSDs at the rate close to 10k objects/second.
Here is the log excerpt of the first crash occurrence:

2018-10-01 03:27:12.762 7fbf16dd6700  0 bluestore(/var/lib/ceph/osd/ceph-1) _balance_bluefs_freespace no allocate on 0x80000000 min_alloc_size 0x1000
2018-10-01 03:27:12.886 7fbf1e5e5700  4 rocksdb: [/build/ceph-13.2.2/src/rocksdb/db/compaction_job.cc:1166] [default] [JOB 24] Generated table #89741: 106356 keys, 68110589 bytes
2018-10-01 03:27:12.886 7fbf1e5e5700  4 rocksdb: EVENT_LOG_v1 {"time_micros": 1538353632892744, "cf_name": "default", "job": 24, "event": "table_file_creation", "file_number": 89741, "file_size": 68110589, "table_properties": {"data_size": 67112903, "index_size": 579319, "filter_size": 417316, "raw_key_size": 6733561, "raw_average_key_size": 63, "raw_value_size": 60994583, "raw_average_value_size": 573, "num_data_blocks": 16336, "num_entries": 106356, "filter_policy_name": "rocksdb.BuiltinBloomFilter", "kDeletedKeys": "14444", "kMergeOperands": "0"}}
2018-10-01 03:27:12.934 7fbf1e5e5700  4 rocksdb: [/build/ceph-13.2.2/src/rocksdb/db/compaction_job.cc:1166] [default] [JOB 24] Generated table #89742: 23214 keys, 16352315 bytes
2018-10-01 03:27:12.934 7fbf1e5e5700  4 rocksdb: EVENT_LOG_v1 {"time_micros": 1538353632938670, "cf_name": "default", "job": 24, "event": "table_file_creation", "file_number": 89742, "file_size": 16352315, "table_properties": {"data_size": 16116986, "index_size": 139894, "filter_size": 94386, "raw_key_size": 1470883, "raw_average_key_size": 63, "raw_value_size": 14775006, "raw_average_value_size": 636, "num_data_blocks": 3928, "num_entries": 23214, "filter_policy_name": "rocksdb.BuiltinBloomFilter", "kDeletedKeys": "90", "kMergeOperands": "0"}}
2018-10-01 03:27:13.042 7fbf1e5e5700  1 bluefs _allocate failed to allocate 0x4100000 on bdev 1, free 0x1a00000; fallback to bdev 2
2018-10-01 03:27:13.042 7fbf1e5e5700 -1 bluefs _allocate failed to allocate 0x4100000 on bdev 2, dne
2018-10-01 03:27:13.042 7fbf1e5e5700 -1 bluefs _flush_range allocated: 0x0 offset: 0x0 length: 0x40ea9f1
2018-10-01 03:27:13.046 7fbf1e5e5700 -1 /build/ceph-13.2.2/src/os/bluestore/BlueFS.cc: In function 'int BlueFS::_flush_range(BlueFS::FileWriter*, uint64_t, uint64_t)' thread 7fbf1e5e5700 time 2018-10-01 03:27:13.048298
/build/ceph-13.2.2/src/os/bluestore/BlueFS.cc: 1663: FAILED assert(0 == "bluefs enospc")

 ceph version 13.2.2 (02899bfda814146b021136e9d8e80eba494e1126) mimic (stable)
 1: (ceph::__ceph_assert_fail(char const*, char const*, int, char const*)+0x102) [0x7fbf2d4fe5c2]
 2: (()+0x26c787) [0x7fbf2d4fe787]
 3: (BlueFS::_flush_range(BlueFS::FileWriter*, unsigned long, unsigned long)+0x1ab4) [0x5619325114b4]
 4: (BlueRocksWritableFile::Flush()+0x3d) [0x561932527c1d]
 5: (rocksdb::WritableFileWriter::Flush()+0x1b9) [0x56193271c399]
 6: (rocksdb::WritableFileWriter::Sync(bool)+0x3b) [0x56193271d42b]
 7: (rocksdb::CompactionJob::FinishCompactionOutputFile(rocksdb::Status const&, rocksdb::CompactionJob::SubcompactionState*, rocksdb::RangeDelAggregator*, CompactionIterationStats*, rocksdb::Slice const*)+0x3db) [0x56193276098b]
 8: (rocksdb::CompactionJob::ProcessKeyValueCompaction(rocksdb::CompactionJob::SubcompactionState*)+0x7d9) [0x561932763da9]
 9: (rocksdb::CompactionJob::Run()+0x314) [0x561932765504]
 10: (rocksdb::DBImpl::BackgroundCompaction(bool*, rocksdb::JobContext*, rocksdb::LogBuffer*, rocksdb::DBImpl::PrepickedCompaction*)+0xc54) [0x5619325b5c44]
 11: (rocksdb::DBImpl::BackgroundCallCompaction(rocksdb::DBImpl::PrepickedCompaction*, rocksdb::Env::Priority)+0x397) [0x5619325b8557]
 12: (rocksdb::DBImpl::BGWorkCompaction(void*)+0x97) [0x5619325b8cd7]
 13: (rocksdb::ThreadPoolImpl::Impl::BGThread(unsigned long)+0x266) [0x5619327a5e36]
 14: (rocksdb::ThreadPoolImpl::Impl::BGThreadWrapper(void*)+0x47) [0x5619327a5fb7]
 15: (()+0xbe733) [0x7fbf2b500733]
 16: (()+0x76db) [0x7fbf2bbf86db]
 17: (clone()+0x3f) [0x7fbf2abbc88f]
 NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.


> On 1.10.2018, at 15:01, Igor Fedotov <ifedotov at suse.de> wrote:
> 
> Hi Sergey,
> 
> could you please provide more details on your OSDs ?
> 
> What are sizes for DB/block devices?
> 
> Do you have any modifications in BlueStore config settings?
> 
> Can you share stats you're referring to?
> 
> 
> Thanks,
> 
> Igor
> 
> 
> On 10/1/2018 12:29 PM, Sergey Malinin wrote:
>> Hello,
>> 3 of 4 NVME OSDs crashed at the same time on assert(0 == "bluefs enospc") and no longer start.
>> Stats collected just before crash show that ceph_bluefs_db_used_bytes is 100% used. Although OSDs have over 50% of free space, it is not reallocated for DB usage.
>> 
>> 2018-10-01 12:18:06.744 7f1d6a04d240  1 bluefs _allocate failed to allocate 0x100000 on bdev 1, free 0x0; fallback to bdev 2
>> 2018-10-01 12:18:06.744 7f1d6a04d240 -1 bluefs _allocate failed to allocate 0x100000 on bdev 2, dne
>> 2018-10-01 12:18:06.744 7f1d6a04d240 -1 bluefs _flush_range allocated: 0x0 offset: 0x0 length: 0xa8700
>> 2018-10-01 12:18:06.748 7f1d6a04d240 -1 /build/ceph-13.2.2/src/os/bluestore/BlueFS.cc: In function 'int BlueFS::_flush_range(BlueFS::FileWriter*, uint64_t, uint64_t)' thread 7f1d6a04d240 time 2018-10-01 12:18:06.746800
>> /build/ceph-13.2.2/src/os/bluestore/BlueFS.cc: 1663: FAILED assert(0 == "bluefs enospc")
>> 
>>  ceph version 13.2.2 (02899bfda814146b021136e9d8e80eba494e1126) mimic (stable)
>>  1: (ceph::__ceph_assert_fail(char const*, char const*, int, char const*)+0x102) [0x7f1d6146f5c2]
>>  2: (()+0x26c787) [0x7f1d6146f787]
>>  3: (BlueFS::_flush_range(BlueFS::FileWriter*, unsigned long, unsigned long)+0x1ab4) [0x5586b22684b4]
>>  4: (BlueRocksWritableFile::Flush()+0x3d) [0x5586b227ec1d]
>>  5: (rocksdb::WritableFileWriter::Flush()+0x1b9) [0x5586b2473399]
>>  6: (rocksdb::WritableFileWriter::Sync(bool)+0x3b) [0x5586b247442b]
>>  7: (rocksdb::BuildTable(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, rocksdb::Env*, rocksdb::ImmutableCFOptions const&, rocksdb::MutableCFOptions const&, rocksdb::EnvOptions const&, rock
>> sdb::TableCache*, rocksdb::InternalIterator*, std::unique_ptr<rocksdb::InternalIterator, std::default_delete<rocksdb::InternalIterator> >, rocksdb::FileMetaData*, rocksdb::InternalKeyComparator const&, std::vector<std::unique_ptr<
>> rocksdb::IntTblPropCollectorFactory, std::default_delete<rocksdb::IntTblPropCollectorFactory> >, std::allocator<std::unique_ptr<rocksdb::IntTblPropCollectorFactory, std::default_delete<rocksdb::IntTblPropCollectorFactory> > > > co
>> nst*, unsigned int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<unsigned long, std::allocator<unsigned long> >, unsigned long, rocksdb::SnapshotChecker*, rocksdb::Compression
>> Type, rocksdb::CompressionOptions const&, bool, rocksdb::InternalStats*, rocksdb::TableFileCreationReason, rocksdb::EventLogger*, int, rocksdb::Env::IOPriority, rocksdb::TableProperties*, int, unsigned long, unsigned long, rocksdb
>> ::Env::WriteLifeTimeHint)+0x1e24) [0x5586b249ef94]
>>  8: (rocksdb::DBImpl::WriteLevel0TableForRecovery(int, rocksdb::ColumnFamilyData*, rocksdb::MemTable*, rocksdb::VersionEdit*)+0xcb7) [0x5586b2321457]
>>  9: (rocksdb::DBImpl::RecoverLogFiles(std::vector<unsigned long, std::allocator<unsigned long> > const&, unsigned long*, bool)+0x19de) [0x5586b232373e]
>>  10: (rocksdb::DBImpl::Recover(std::vector<rocksdb::ColumnFamilyDescriptor, std::allocator<rocksdb::ColumnFamilyDescriptor> > const&, bool, bool, bool)+0x5d4) [0x5586b23242f4]
>>  11: (rocksdb::DBImpl::Open(rocksdb::DBOptions const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<rocksdb::ColumnFamilyDescriptor, std::allocator<rocksdb::ColumnFamilyDescri
>> ptor> > const&, std::vector<rocksdb::ColumnFamilyHandle*, std::allocator<rocksdb::ColumnFamilyHandle*> >*, rocksdb::DB**, bool)+0x68b) [0x5586b232559b]
>>  12: (rocksdb::DB::Open(rocksdb::DBOptions const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<rocksdb::ColumnFamilyDescriptor, std::allocator<rocksdb::ColumnFamilyDescriptor
>>>> const&, std::vector<rocksdb::ColumnFamilyHandle*, std::allocator<rocksdb::ColumnFamilyHandle*> >*, rocksdb::DB**)+0x22) [0x5586b2326e72]
>>  13: (RocksDBStore::do_open(std::ostream&, bool, std::vector<KeyValueDB::ColumnFamily, std::allocator<KeyValueDB::ColumnFamily> > const*)+0x170c) [0x5586b220219c]
>>  14: (BlueStore::_open_db(bool, bool)+0xd8e) [0x5586b218ee1e]
>>  15: (BlueStore::_mount(bool, bool)+0x4b7) [0x5586b21bf807]
>>  16: (OSD::init()+0x295) [0x5586b1d673c5]
>>  17: (main()+0x268d) [0x5586b1c554ed]
>>  18: (__libc_start_main()+0xe7) [0x7f1d5ea2db97]
>>  19: (_start()+0x2a) [0x5586b1d1d7fa]
>>  NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.
>> 
>> _______________________________________________
>> ceph-users mailing list
>> ceph-users at lists.ceph.com
>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
> 



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