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https://issues.apache.org/jira/browse/CASSANDRA-4938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17251422#comment-17251422
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Kirk True commented on CASSANDRA-4938:
--------------------------------------
When trying to query against the table using the index before it's fully
created, I see this error on the server:
{noformat}
java.lang.RuntimeException:
org.apache.cassandra.index.IndexNotAvailableException: The secondary index
'test_table_user_name_idx' is not yet available
at
org.apache.cassandra.service.StorageProxy$DroppableRunnable.run(StorageProxy.java:2729)
at
java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at
org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:162)
at
org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$LocalSessionFutureTask.run(AbstractLocalAwareExecutorService.java:134)
at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:119)
at
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: org.apache.cassandra.index.IndexNotAvailableException: The secondary
index 'test_table_user_name_idx' is not yet available
at
org.apache.cassandra.db.ReadCommand.executeLocally(ReadCommand.java:445)
at
org.apache.cassandra.service.StorageProxy$LocalReadRunnable.runMayThrow(StorageProxy.java:2011)
at
org.apache.cassandra.service.StorageProxy$DroppableRunnable.run(StorageProxy.java:2725)
... 6 common frames omitted
{noformat}
and this in `cqlsh`:
{noformat}
ReadFailure: Error from server: code=1300 [Replica(s) failed to execute read]
message="Operation failed - received 0 responses and 1 failures: UNKNOWN from
localhost/127.0.0.1:7000" info={'failures': 1, 'received_responses': 0,
'required_responses': 1, 'consistency': 'ONE'}
{noformat}
It looks like the schema update event is fired on the _start_ of the index
creation, not on its _completion_.
> CREATE INDEX can block for creation now that schema changes may be concurrent
> -----------------------------------------------------------------------------
>
> Key: CASSANDRA-4938
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4938
> Project: Cassandra
> Issue Type: Improvement
> Components: Feature/2i Index
> Reporter: Krzysztof Cieslinski Cognitum
> Assignee: Kirk True
> Priority: Low
> Labels: lhf
> Fix For: 4.x
>
>
> Response from CREATE INDEX command comes faster than the creation of
> secondary index. So below code:
> {code:xml}
> CREATE INDEX ON tab(name);
> SELECT * FROM tab WHERE name = 'Chris';
> {code}
> doesn't return any rows(of course, in column family "tab", there are some
> records with "name" value = 'Chris'..) and any errors ( i would expect
> something like ??"Bad Request: No indexed columns present in by-columns
> clause with Equal operator"??)
> Inputing some timeout between those two commands resolves the problem, so:
> {code:xml}
> CREATE INDEX ON tab(name);
> Sleep(timeout); // for column family with 2000 rows the timeout had to be set
> for ~1 second
> SELECT * FROM tab WHERE name = 'Chris';
> {code}
> will return all rows with values as specified.
> I'm using single node cluster.
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