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FailureDetector: check that states is not null before use 

When a node is part of a cluster but is down (like in the situation where
a cluster is taken down and up again but not all nodes are up). There is
no application_state information for that node.

This patch check that the information exists before using it to prevent
null pointer exception.

After this patch, a call to nodetool gossipinfo would return the
available information without failing.

See scylladb/scylla#3330

Signed-off-by: Amnon Heiman <amnon@scylladb.com>
Message-Id: <20180329115345.29357-1-amnon@scylladb.com>
This commit is contained in:
Amnon Heiman 2018-03-29 14:53:45 +03:00 committed by Avi Kivity
parent 8d499401f0
commit 4e4589ba6f
1 changed files with 5 additions and 3 deletions
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8
src/main/java/org/apache/cassandra/gms/FailureDetector.java
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@ -105,9 +105,11 @@ public class FailureDetector extends APIMBean implements FailureDetectorMBean {
ep.setAliave(obj.getBoolean("is_alive"));
ep.setUpdateTimestamp(obj.getJsonNumber("update_time").longValue());
JsonArray states = obj.getJsonArray("application_state");
for (int j = 0; j < states.size(); j++) {
JsonObject state = states.getJsonObject(j);
ep.addApplicationState(state.getInt("application_state"), state.getString("value"));
if (states != null) {
for (int j = 0; j < states.size(); j++) {
JsonObject state = states.getJsonObject(j);
ep.addApplicationState(state.getInt("application_state"), state.getString("value"));
}
}
res.put(obj.getString("addrs"), ep);
}