Brian Nixon created ZOOKEEPER-3082:
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Summary: Fix server snapshot behavior when out of disk space
Key: ZOOKEEPER-3082
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3082
Project: ZooKeeper
Issue Type: Bug
Components: server
Affects Versions: 3.4.12, 3.6.0, 3.5.5
Reporter: Brian Nixon
When the ZK server tries to make a snapshot and the machine is out of disk
space, the snapshot creation fails and throws an IOException. An empty snapshot
file is created, (probably because the server is able to create an entry in the
dir) but is not able to write to the file.
If snapshot creation fails, the server commits suicide. When it restarts, it
will do so from the last known good snapshot. However, when it tries to make a
snapshot again, the same thing happens. This results in lots of empty snapshot
files being created. If eventually the DataDirCleanupManager garbage collects
the good snapshot files then only the empty files remain. At this point, the
server is well and truly screwed.
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