Jaydeepkumar Chovatia created CASSANDRA-14952:
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Summary: NPE when using allocate_tokens_for_keyspace and add new DC
Key: CASSANDRA-14952
URL: https://issues.apache.org/jira/browse/CASSANDRA-14952
Project: Cassandra
Issue Type: Bug
Components: Cluster/Gossip
Reporter: Jaydeepkumar Chovatia
Received following NPE while bootstrapping very first node in the new
datacenter with {{allocate_tokens_for_keyspace}} yaml option
{code:java}
INFO 21:44:13 JOINING: getting bootstrap token
Exception (java.lang.NullPointerException) encountered during startup: null
java.lang.NullPointerException
at
org.apache.cassandra.dht.tokenallocator.TokenAllocation.getStrategy(TokenAllocation.java:208)
at
org.apache.cassandra.dht.tokenallocator.TokenAllocation.getStrategy(TokenAllocation.java:170)
at
org.apache.cassandra.dht.tokenallocator.TokenAllocation.allocateTokens(TokenAllocation.java:55)
at
org.apache.cassandra.dht.BootStrapper.allocateTokens(BootStrapper.java:206)
at
org.apache.cassandra.dht.BootStrapper.getBootstrapTokens(BootStrapper.java:173)
at
org.apache.cassandra.service.StorageService.joinTokenRing(StorageService.java:854)
at
org.apache.cassandra.service.StorageService.initServer(StorageService.java:666)
at
org.apache.cassandra.service.StorageService.initServer(StorageService.java:579)
at
org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:351)
at
org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:586)
at
org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:714)
{code}
Please find reproducible steps here:
1. Set {{allocate_tokens_for_keyspace}} property with
{{Networktopologystrategy}} say {{{{Networktopologystrategy, 'dc1' : 1, 'dc2' :
1}}}}
2. Start first node in {{dc1}}
3. Now bootstrap second node in {{dc2,}} it will throw above exception.
RCA:
[doAddEndpoint|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/locator/TokenMetadata.java#L1325]
is invoked from the
[bootstrap|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/service/StorageService.java#L1254]
and at this time [local node's rack
information|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/locator/TokenMetadata.java#L1276]
is available
However with have {{allocate_tokens_for_keyspace}} option, daemon tries to
access rack information even before calling
[bootstrap|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/service/StorageService.java#L1241]
function, at [this
place|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/service/StorageService.java#L878]
which results in NPE
Fix:
Since this is applicable to only very first node for new dc, we can check for
{{null}} as:
{code:java}
diff --git
a/src/java/org/apache/cassandra/dht/tokenallocator/TokenAllocation.java
b/src/java/org/apache/cassandra/dht/tokenallocator/TokenAllocation.java
index 8d8a6ffeca..e162757d95 100644
--- a/src/java/org/apache/cassandra/dht/tokenallocator/TokenAllocation.java
+++ b/src/java/org/apache/cassandra/dht/tokenallocator/TokenAllocation.java
@@ -205,7 +205,11 @@ public class TokenAllocation
final int replicas = rs.getReplicationFactor(dc);
Topology topology = tokenMetadata.getTopology();
- int racks = topology.getDatacenterRacks().get(dc).asMap().size();
+ int racks = 1;
+ if (topology.getDatacenterRacks().get(dc) != null)
+ {
+ racks = topology.getDatacenterRacks().get(dc).asMap().size();
+ }
if (racks >= replicas)
{
{code}
Let me know your comments.
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