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From Carl Mueller <carl.muel...@smartthings.com.INVALID>
Subject Re: postmortem on 2.2.13 scale out difficulties
Date Wed, 12 Jun 2019 21:11:03 GMT
I posted a bug, cassandra-15155 :
https://issues.apache.org/jira/browse/CASSANDRA-15155?jql=project%20%3D%20CASSANDRA

It seems VERY similar to
https://issues.apache.org/jira/browse/CASSANDRA-6648

On Wed, Jun 12, 2019 at 12:14 PM Carl Mueller <carl.mueller@smartthings.com>
wrote:

> And once the cluster token map formation is done, it starts bootstrap and
> we get a ton of these:
>
> WARN  [MessagingService-Incoming-/2406:da14:95b:4503:910e:23fd:dafa:9983]
> 2019-06-12 15:22:04,760 IncomingTcpConnection.java:100 -
> UnknownColumnFamilyException reading from socket; closing
> org.apache.cassandra.db.UnknownColumnFamilyException: Couldn't find
> cfId=df425400-c331-11e8-8b96-4b7f4d58af68
>
> And then after LOTS of those
>
> INFO  [main] 2019-06-12 15:23:25,515 StorageService.java:1142 - JOINING:
> Starting to bootstrap...
> INFO  [main] 2019-06-12 15:23:25,525 StreamResultFuture.java:87 - [Stream
> #05af9ee0-8d26-11e9-85c1-bd5476090c54] Executing streaming plan for
> Bootstrap
> INFO  [main] 2019-06-12 15:23:25,526 StorageService.java:1199 - Bootstrap
> completed! for the tokens [-7314981925085449175, ... bunch of tokens...
> 5499447097629838103]
>
>
> On Wed, Jun 12, 2019 at 12:07 PM Carl Mueller <
> carl.mueller@smartthings.com> wrote:
>
>> One node at a time: yes that is what we are doing
>>
>> We have not tried the streaming_socket_timeout_in_ms. It is currently 24
>> hours. (```streaming_socket_timeout_in_ms=86400000```) which would cover
>> the bootstrap timeframe we have seen before (1-2 hours per node)
>>
>> Since it joins with no data, it is serving erroneous data. We may try
>> bootstrap rejoin and the JVM_OPT.... The node appears to think it has
>> bootstrapped even though the gossipinfo shows the new node has a different
>> schema version.
>>
>> We had scaled EU and US from 5 --> 25 without incident (one at a time),
>> and since we increased ring_delay_ms worked haphazardly to get us four
>> joins, and since then failure.
>>
>> The debug log shows:
>>
>> DEBUG [GossipStage:1] 2019-06-12 15:20:08,559 StorageService.java:1998 -
>> New node /2a05:d018:af:1108:86f4:d628:6bca:6983 at token 9200286188287490229
>> DEBUG [GossipStage:1] 2019-06-12 15:20:08,559 StorageService.java:1998 -
>> New node /2a05:d018:af:1108:86f4:d628:6bca:6983 at token 950856676715905899
>> DEBUG [GossipStage:1] 2019-06-12 15:20:08,563 MigrationManager.java:96 -
>> Not pulling schema because versions match or shouldPullSchemaFrom returned
>> false
>> INFO  [GossipStage:1] 2019-06-12 15:20:08,563 TokenMetadata.java:464 -
>> Updating topology for /2a05:d018:af:1108:86f4:d628:6bca:6983
>> INFO  [GossipStage:1] 2019-06-12 15:20:08,564 TokenMetadata.java:464 -
>> Updating topology for /2a05:d018:af:1108:86f4:d628:6bca:6983
>> DEBUG [GossipStage:1] 2019-06-12 15:20:08,565 MigrationManager.java:96 -
>> Not pulling schema because versions match or shouldPullSchemaFrom returned
>> false
>> INFO  [GossipStage:1] 2019-06-12 15:20:08,565 Gossiper.java:1027 - Node
>> /2600:1f18:4b4:5903:64af:955e:b65:8d83 is now part of the cluster
>> DEBUG [GossipStage:1] 2019-06-12 15:20:08,587 StorageService.java:1928 -
>> Node /2600:1f18:4b4:5903:64af:955e:b65:8d83 state NORMAL, token
>> [-1028768087263234868, ...<bunch of tokens>..., 921670352349030554]
>> DEBUG [GossipStage:1] 2019-06-12 15:20:08,588 StorageService.java:1998 -
>> New node /2600:1f18:4b4:5903:64af:955e:b65:8d83 at token
>> -1028768087263234868
>> DEBUG [GossipStage:1] 2019-06-12 15:20:08,588 StorageService.java:1998 -
>> New node /2600:1f18:4b4:5903:64af:955e:b65:8d83 at token
>> -1045740236536355596
>> DEBUG [GossipStage:1] 2019-06-12 15:20:08,589 StorageService.java:1998 -
>> New node /2600:1f18:4b4:5903:64af:955e:b65:8d83 at token
>> -1184422937682103096
>> DEBUG [GossipStage:1] 2019-06-12 15:20:08,589 StorageService.java:1998 -
>> New node /2600:1f18:4b4:5903:64af:955e:b65:8d83 at token
>> -1201924032068728250
>>
>> All the nodes appear to be reporting "Not pulling schema becuase versions
>> match or shouldPullSchmeaFrom returned false. That code
>> (MigrationManager.java) makes reference to a "gossip only" node, did we get
>> stuck in that somehow.
>>
>> On Wed, Jun 12, 2019 at 11:45 AM ZAIDI, ASAD A <az192g@att.com> wrote:
>>
>>>
>>>
>>>
>>>
>>> Adding one node at a time – is that successful?
>>>
>>> Check value of streaming_socket_timeout_in_ms parameter in
>>> cassandra.yaml and increase if needed.
>>>
>>> Have you tried Nodetool bootstrap resume & jvm option i.e.
>>> JVM_OPTS="$JVM_OPTS -Dcassandra.consistent.rangemovement=false"  ?
>>>
>>>
>>>
>>>
>>>
>>> *From:* Carl Mueller [mailto:carl.mueller@smartthings.com.INVALID]
>>> *Sent:* Wednesday, June 12, 2019 11:35 AM
>>> *To:* user@cassandra.apache.org
>>> *Subject:* Re: postmortem on 2.2.13 scale out difficulties
>>>
>>>
>>>
>>> We only were able to scale out four nodes and then failures started
>>> occurring, including multiple instances of nodes joining a cluster without
>>> streaming.
>>>
>>>
>>>
>>> Sigh.
>>>
>>>
>>>
>>> On Tue, Jun 11, 2019 at 3:11 PM Carl Mueller <
>>> carl.mueller@smartthings.com> wrote:
>>>
>>> We had a three-DC (asia-tokyo/europe/us) cassandra 2.2.13 cluster, AWS,
>>> IPV6
>>>
>>> Needed to scale out the asia datacenter, which was 5 nodes, europe and
>>> us were 25 nodes
>>>
>>> We were running into bootstrapping issues where the new node failed to
>>> bootstrap/stream, it failed with
>>>
>>>
>>>
>>> "java.lang.RuntimeException: A node required to move the data
>>> consistently is down"
>>>
>>>
>>>
>>> ...even though they were all up based on nodetool status prior to adding
>>> the node.
>>>
>>> First we increased the phi_convict_threshold to 12, and that did not
>>> help.
>>>
>>> CASSANDRA-12281 appeared similar to what we had problems with, but I
>>> don't think we hit that. Somewhere in there someone wrote
>>>
>>>
>>>
>>> "For us, the workaround is either deleting the data (then bootstrap
>>> again), or increasing the ring_delay_ms. And the larger the cluster is, the
>>> longer ring_delay_ms is needed. Based on our tests, for a 40 nodes cluster,
>>> it requires ring_delay_ms to be >50seconds. For a 70 nodes cluster,
>>> >100seconds. Default is 30seconds."
>>>
>>> Given the WAN nature or our DCs, we used ring_delay_ms to 100 seconds
>>> and it finally worked.
>>>
>>> side note:
>>>
>>> During the rolling restarts for setting phi_convict_threshold we
>>> observed quite a lot of status map variance between nodes (we have a
>>> program to poll all of a datacenter or cluster's view of the gossipinfo and
>>> statuses. AWS appears to have variance in networking based on the
>>> phi_convict_threshold advice, I'm not sure if our difficulties were typical
>>> in that regard and/or if our IPV6 and/or globally distributed datacenters
>>> were exacerbating factors.
>>>
>>> We could not reproduce this in loadtest, although loadtest is only eu
>>> and us (but is IPV6)
>>>
>>>

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