Alexey Serba created SOLR-9471:
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Summary: Another race condition in ClusterStatus.getClusterStatus
Key: SOLR-9471
URL: https://issues.apache.org/jira/browse/SOLR-9471
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Components: SolrCloud
Affects Versions: 6.1
Reporter: Alexey Serba
Priority: Minor
Reading cluster state information using {{/collections?action=CLUSTERSTATUS}}
can fail if there's a concurrent deletion of a collection with its configset.
The code in {{ClusterStatus.getClusterStatus}}
* gets collection names
* for every collection reads its "config name" from Zk
The problem is that if there's a concurrent delete operation for a collection
and its configset in between then {{ClusterState.getCollection}} can fail thus
causing the whole operation to fail. It seems that it would be better to catch
Zk's {{NoNodeException}} for this particular case and handle it somehow (can we
ignore this collection right away or should we re-check?)
{noformat}
Error loading config name for collection test (500) Trace:
org.apache.solr.common.SolrException: Error loading config name for collection
test
at
org.apache.solr.common.cloud.ZkStateReader.readConfigName(ZkStateReader.java:196)
at
org.apache.solr.handler.admin.ClusterStatus.getClusterStatus(ClusterStatus.java:141)
at
org.apache.solr.handler.admin.CollectionsHandler$CollectionOperation$21.call(CollectionsHandler.java:695)
...
Caused by: org.apache.zookeeper.KeeperException$NoNodeException:
KeeperErrorCode = NoNode for /collections/test
at org.apache.zookeeper.KeeperException.create(KeeperException.java:111)
at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1155)
at
org.apache.solr.common.cloud.SolrZkClient$7.execute(SolrZkClient.java:348)
at
org.apache.solr.common.cloud.SolrZkClient$7.execute(SolrZkClient.java:345)
at
org.apache.solr.common.cloud.ZkCmdExecutor.retryOperation(ZkCmdExecutor.java:60)
at
org.apache.solr.common.cloud.SolrZkClient.getData(SolrZkClient.java:345)
at
org.apache.solr.common.cloud.ZkStateReader.readConfigName(ZkStateReader.java:178)
... 32 more
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