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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5725) Silently failing messages in case of schema not fully propagated
Date Thu, 04 Jul 2013 16:57:48 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13700213#comment-13700213
] 

Jonathan Ellis commented on CASSANDRA-5725:
-------------------------------------------

bq. Finally, a trivial one may just be to make the schema problem explicit with a specific
exception.

This is not trivial since replicas only ack writes on success.

Here's how it's supposed to work: you perform your schema change, then you check for schema
agreement before starting to write to the new table.
                
> Silently failing messages in case of schema not fully propagated
> ----------------------------------------------------------------
>
>                 Key: CASSANDRA-5725
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5725
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 1.2.6
>            Reporter: Sergio Bossa
>
> When a new keyspace and/or column family is created on a multi nodes cluster (at least
three), and then a mutation is executed on such new column family, the operations sometimes
silently fails by timing out.
> I tracked this down to the schema not being fully propagated to all nodes. Here's what
happens:
> 1) Node 1 receives the create keyspace/column family request.
> 2) The same node receives a mutation request at CL.QUORUM and sends to other nodes too.
> 3) Upon receiving the mutation request, other nodes try to deserialize it and fail in
doing so if the schema is not fully propagated, i.e. because they don't find the mutated column
family.
> 4) The connection between node 1 and the failed node is dropped, and the request on the
former hangs until timing out.
> Here is the underlying exception, I had to tweak several log levels to get it: 
> {noformat}
> INFO 13:11:39,441 IOException reading from socket; closing
> org.apache.cassandra.db.UnknownColumnFamilyException: Couldn't find cfId=a31c7604-0e40-393b-82d7-ba3d910ad50a
> 	at org.apache.cassandra.db.ColumnFamilySerializer.deserializeCfId(ColumnFamilySerializer.java:184)
> 	at org.apache.cassandra.db.ColumnFamilySerializer.deserialize(ColumnFamilySerializer.java:94)
> 	at org.apache.cassandra.db.RowMutation$RowMutationSerializer.deserialize(RowMutation.java:397)
> 	at org.apache.cassandra.db.RowMutation$RowMutationSerializer.deserialize(RowMutation.java:407)
> 	at org.apache.cassandra.db.RowMutation$RowMutationSerializer.deserialize(RowMutation.java:367)
> 	at org.apache.cassandra.net.MessageIn.read(MessageIn.java:94)
> 	at org.apache.cassandra.net.IncomingTcpConnection.receiveMessage(IncomingTcpConnection.java:207)
> 	at org.apache.cassandra.net.IncomingTcpConnection.handleModernVersion(IncomingTcpConnection.java:139)
> 	at org.apache.cassandra.net.IncomingTcpConnection.run(IncomingTcpConnection.java:82)
> {noformat}
> Finally, there's probably a correlated failure happening during repairs of newly created/mutated
column family, causing the repair process to hang forever as follows:
> {noformat}
> "AntiEntropySessions:1" daemon prio=5 tid=7fe981148000 nid=0x11abea000 in Object.wait()
[11abe9000]
>    java.lang.Thread.State: WAITING (on object monitor)
> 	at java.lang.Object.wait(Native Method)
> 	- waiting on <7c6200840> (a org.apache.cassandra.utils.SimpleCondition)
> 	at java.lang.Object.wait(Object.java:485)
> 	at org.apache.cassandra.utils.SimpleCondition.await(SimpleCondition.java:34)
> 	- locked <7c6200840> (a org.apache.cassandra.utils.SimpleCondition)
> 	at org.apache.cassandra.service.AntiEntropyService$RepairSession.runMayThrow(AntiEntropyService.java:695)
> 	at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
> 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
> 	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> 	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
> 	at java.lang.Thread.run(Thread.java:680)
> "http-8983-1" daemon prio=5 tid=7fe97d24d000 nid=0x11a5c8000 in Object.wait() [11a5c6000]
>    java.lang.Thread.State: WAITING (on object monitor)
> 	at java.lang.Object.wait(Native Method)
> 	- waiting on <7c620db58> (a org.apache.cassandra.utils.SimpleCondition)
> 	at java.lang.Object.wait(Object.java:485)
> 	at org.apache.cassandra.utils.SimpleCondition.await(SimpleCondition.java:34)
> 	- locked <7c620db58> (a org.apache.cassandra.utils.SimpleCondition)
> 	at org.apache.cassandra.service.StorageService$4.runMayThrow(StorageService.java:2442)
> 	at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
> 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
> 	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> 	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> 	at org.apache.cassandra.service.StorageService.forceTableRepairRange(StorageService.java:2409)
> 	at org.apache.cassandra.service.StorageService.forceTableRepair(StorageService.java:2387)
> 	at com.datastax.bdp.cassandra.index.solr.SolrCoreResourceManager.repairResources(SolrCoreResourceManager.java:693)
> 	at com.datastax.bdp.cassandra.index.solr.SolrCoreResourceManager.createCore(SolrCoreResourceManager.java:255)
> 	at com.datastax.bdp.cassandra.index.solr.CassandraCoreAdminHandler.handleCreateAction(CassandraCoreAdminHandler.java:121)
> 	at org.apache.solr.handler.admin.CoreAdminHandler.handleRequestBody(CoreAdminHandler.java:144)
> 	at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:135)
> 	at org.apache.solr.servlet.SolrDispatchFilter.handleAdminRequest(SolrDispatchFilter.java:615)
> 	at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:206)
> {noformat}
> I wasn't able to track any exception as I can't reproduce it reliably enough, but I believe
it's correlated to schema propagation as based on log messages the merkle tree request on
node 1 happens concurrently to schema installation on other nodes.

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