client.WriteSeries returns: Server returned (400):  IO error: /opt/influxdb/shared/data/db/shard_db_v2/00190/MANIFEST-000006: No such file or directory

using https://github.com/vimeo/whisper-to-influxdb/ which invokes `influxClient.WriteSeriesWithTimePrecision(toCommit, client.Second)`
to write a series called "servers.dfvimeostatsd1.diskspace.root.inodes_free" with 60643 records of (time, sequence_number, value) format, to my graphite database, which i recreated from scratch yesterday after i upgraded.
```
influx> list shardspaces
Database    Name Regex Retention Duration RF Split
graphite default  /.*/      365d       7d  1     1
influx> 
```

got this response:
```
Server returned (400): IO error: /opt/influxdb/shared/data/db/shard_db_v2/00190/MANIFEST-000006: No such file or directory
```

my influxdb is 0.8.3, has debug logging enabled,
but the log only contains messages matching
`(GraphiteServer committing|Executing leader loop|Dumping the cluster config|Testing if we should|Checking for shards to drop)`, no other messages.
I also checked dmesg, no errors there. ditto for /var/log/messages, nothing useful there.