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From Sameer Kumar <sam.kum.w...@gmail.com>
Subject Re: Kafka 11 | Stream Application crashed the brokers
Date Wed, 13 Sep 2017 06:46:10 GMT
Hi Guozhang,

The producer sending data to this topic is not running concurrently with
the stream processing. I had first ingested the data from another cluster
and then have the stream processing ran on it. The producer code is written
by me and it doesnt have transactions on by default.

I will double check if someone else has transaction turned on, but this is
quite unlikely. Is there someway to verify it through logs.

All of this behavior works fine when brokers are run on Kafka 10, this
might be because transactions are only available on Kafka11. I am
suspecting would there be a case that too much processing is causing one of
the brokers to crash. The timeouts are indicating that it is taking time to
send data

I have tried this behavior also on a another cluster which I exclusively
use it for myself and found the same behavior there as well.

What do you think should be our next step so that we can get to the root of
the issue.

-Sameer.

On Wed, Sep 13, 2017 at 6:14 AM, Guozhang Wang <wangguoz@gmail.com> wrote:

> Hi Sameer,
>
> If no clients has transactions turned on the `__transaction_state` internal
> topic would not be created at all. So I still suspect that some of your
> clients (maybe not your Streams client, but your Producer client that is
> sending data to the source topic?) has transactions turned on.
>
> BTW from your logs I saw lots of the following errors on client side:
>
> 2017-09-11 12:42:34 ERROR RecordCollectorImpl:113 - task [0_6] Error
> sending record to topic c-7-e6-KSTREAM-BRANCHCHILD-0000000007-repartition.
> No more offsets will be recorded for this task and the exception will
> eventually be thrown
>
> org.apache.kafka.common.errors.*TimeoutException*: Expiring 13 record(s)
> for c-7-e6-KSTREAM-BRANCHCHILD-0000000007-repartition-3: 31174 ms has
> passed since last append
>
> 2017-09-11 12:42:36 WARN  Sender:511 - Got error produce response with
> correlation id 82862 on topic-partition
> c-7-e6-KSTREAM-JOINTHIS-0000000018-store-changelog-22, retrying
> (2147483646
> attempts left). *Error: NETWORK_EXCEPTION*
>
> 2017-09-11 12:42:36 ERROR RecordCollectorImpl:113 - task [0_22] Error
> sending record to topic c-7-e6-KSTREAM-BRANCHCHILD-0000000007-repartition.
> No more offsets will be recorded for this task and the exception will
> eventually be thrown
>
> org.apache.kafka.common.errors.*TimeoutException*: Expiring 13 record(s)
> for c-7-e6-KSTREAM-BRANCHCHILD-0000000007-repartition-3: 31467 ms has
> passed since last append
>
>
> Today if the TimeoutException is thrown from the recordCollector it will
> cause the Streams to throw this exception all the way to the user exception
> handler and then shutdown the thread. And this exception would be thrown if
> the Kafka broker itself is not available (also from your previous logs it
> seems broker 192 and 193 was unavailable and hence being kicked out by
> broker 109 out of the IRS).
>
>
> Guozhang
>
>
>
> On Mon, Sep 11, 2017 at 3:40 AM, Sameer Kumar <sam.kum.work@gmail.com>
> wrote:
>
> > Hi Guozhang,
> >
> > Please find the relevant logs, see a folder for client logs as well,
> > things started getting awry at 12:42:05.
> > Let me know if you need any more information.
> >
> > -Sameer.
> >
> > On Sun, Sep 10, 2017 at 5:06 PM, Sameer Kumar <sam.kum.work@gmail.com>
> > wrote:
> >
> >> Hi Guozhang,
> >>
> >> Nope, I was not using exactly-once mode. I dont have the client logs
> with
> >> me right now, I will try to replicate it again and share the other
> details
> >> with you.
> >>
> >> My concern was that it crashed my brokers as well.
> >>
> >> -Sameer.
> >>
> >> On Sat, Sep 9, 2017 at 1:51 AM, Guozhang Wang <wangguoz@gmail.com>
> wrote:
> >>
> >>> Hello Sameer,
> >>>
> >>> I looked through your code, and here is what I figured: in 0.11 version
> >>> we
> >>> added the exactly-once feature (
> >>> https://cwiki.apache.org/confluence/display/KAFKA/KIP-98+-+E
> >>> xactly+Once+Delivery+and+Transactional+Messaging
> >>> )
> >>>
> >>> Which uses the transaction log (internal topic named
> >>> "__transaction_state")
> >>> that has a default replication of 3 (that will overwrite your global
> >>> config
> >>> value of 2). Then at around 12:30, the leader of the transation log
> >>> partition kicked both replicas of 190 and 192 out of the replica:
> >>>
> >>> [2017-09-05 12:30:31,256] INFO [GroupCoordinator 193]: Preparing to
> >>> rebalance group KafkaCache_TEST15 with old generation 14
> >>> (__consumer_offsets-27) (kafka.coordinator.group.GroupCoordinator)
> >>>
> >>> *[2017-09-05 12:30:41,510] INFO Partition [__transaction_state,9] on
> >>> broker
> >>> 193: Shrinking ISR from 193,192,190 to 193 (kafka.cluster.Partition)*
> >>>
> >>> *[2017-09-05 12:30:41,513] INFO Partition [__transaction_state,6] on
> >>> broker
> >>> 193: Shrinking ISR from 193,190,192 to 193 (kafka.cluster.Partition)*
> >>>
> >>> *[2017-09-05 12:30:41,514] INFO Partition [__transaction_state,3] on
> >>> broker
> >>> 193: Shrinking ISR from 193,192,190 to 193 (kafka.cluster.Partition)*
> >>>
> >>> *[2017-09-05 12:30:41,515] INFO Partition [__transaction_state,18] on
> >>> broker 193: Shrinking ISR from 193,190,192 to 193
> >>> (kafka.cluster.Partition)*
> >>>
> >>> *[2017-09-05 12:30:41,515] INFO Partition [__transaction_state,15] on
> >>> broker 193: Shrinking ISR from 193,192,190 to 193
> >>> (kafka.cluster.Partition)*
> >>>
> >>> *[2017-09-05 12:30:41,516] INFO Partition [__transaction_state,12] on
> >>> broker 193: Shrinking ISR from 193,190,192 to 193
> >>> (kafka.cluster.Partition)*
> >>>
> >>> *[2017-09-05 12:30:41,516] INFO Partition [__consumer_offsets,12] on
> >>> broker
> >>> 193: Shrinking ISR from 193,192,190 to 193 (kafka.cluster.Partition)*
> >>>
> >>> *[2017-09-05 12:30:41,517] INFO Partition [__consumer_offsets,15] on
> >>> broker
> >>> 193: Shrinking ISR from 193,192,190 to 193 (kafka.cluster.Partition)*
> >>>
> >>> *[2017-09-05 12:30:41,517] INFO Partition [__transaction_state,24] on
> >>> broker 193: Shrinking ISR from 193,190,192 to 193
> >>> (kafka.cluster.Partition)*
> >>>
> >>> At the mean time, both replicas of 190 and 192 seems to be timed out on
> >>> their fetch requests (note the big timestamp gap in the logs):
> >>>
> >>> [2017-09-05 12:26:21,130] INFO Rolled new log segment for 'AdServe-4'
> in
> >>> 1
> >>> ms. (kafka.log.Log)
> >>> [2017-09-05 12:30:59,046] WARN [ReplicaFetcherThread-2-193]: Error in
> >>> fetch
> >>> to broker 193, request (type=FetchRequest, replicaId=190, maxWait=500,
> >>> minBytes=1, maxBytes=10485760, fetchData={__consumer_offsets-
> >>> 21=(offset=0,
> >>> logStartOffset=0, maxBytes=1048576)
> >>>
> >>> ...
> >>>
> >>> [2017-09-05 12:28:37,514] INFO Deleting index
> >>> /data1/kafka/AdServe-5/00000000000405000294.timeindex.deleted
> >>> (kafka.log.TimeIndex)
> >>> [2017-09-05 12:30:59,042] WARN [ReplicaFetcherThread-2-193]: Error in
> >>> fetch
> >>> to broker 193, request (type=FetchRequest, replicaId=192, maxWait=500,
> >>> minBytes=1, maxBytes=10485760, fetchData={__consumer_offsets-
> >>> 21=(offset=0,
> >>> logStartOffset=0, maxBytes=1048576)
> >>>
> >>>
> >>>
> >>> This caused the NotEnoughReplicasException since any appends to the
> >>> transaction logs are required "acks=all, and min.isr=num.replicas".
> >>>
> >>> *[2017-09-05 12:32:11,612] ERROR [Replica Manager on Broker 193]: Error
> >>> processing append operation on partition __transaction_state-18
> >>> (kafka.server.ReplicaManager)*
> >>>
> >>> *org.apache.kafka.common.errors.NotEnoughReplicasException: Number of
> >>> insync replicas for partition __transaction_state-18 is [1], below
> >>> required
> >>> minimum [3]*
> >>>
> >>> Upon seeing this error, the transaction coordinator should retry
> >>> appending,
> >>> but if the retry never succeeds it will be blocked. I did not see the
> >>> Streams API client-side logs and so cannot tell for sure, why this
> caused
> >>> the Streams app to fail as well. A quick question: did you enable
> >>> `processing.mode=exactly-once` on your streams app?
> >>>
> >>>
> >>> Guozhang
> >>>
> >>>
> >>>
> >>>
> >>> On Fri, Sep 8, 2017 at 1:34 AM, Sameer Kumar <sam.kum.work@gmail.com>
> >>> wrote:
> >>>
> >>> > Hi All,
> >>> >
> >>> >
> >>> > Any thoughts on the below mail.
> >>> >
> >>> > -Sameer.
> >>> >
> >>> > On Wed, Sep 6, 2017 at 12:28 PM, Sameer Kumar <
> sam.kum.work@gmail.com>
> >>> > wrote:
> >>> >
> >>> > > Hi All,
> >>> > >
> >>> > > I want to report a scenario wherein my running 2 different
> instances
> >>> of
> >>> > my
> >>> > > stream application caused my brokers to crash and eventually my
> >>> stream
> >>> > > application as well. This scenario only happens when my brokers
run
> >>> on
> >>> > > Kafka11, everything works fine if my brokers are on Kafka 10..2
and
> >>> > stream
> >>> > > application on Kafka11.
> >>> > >
> >>> > > I am attaching herewith the logs in a zipped format.
> >>> > >
> >>> > > The cluster configuration
> >>> > > 3 nodes(190,192,193) , Kafka 11
> >>> > > Topic Replication Factor - 2
> >>> > >
> >>> > > App configuration
> >>> > > Kafka 11 streams.
> >>> > >
> >>> > >
> >>> > > The error I saw on 193 server was org.apache.kafka.common.errors.
> >>> > NotEnoughReplicasException:
> >>> > > Number of insync replicas for partition __transaction_state-18
is
> >>> [1],
> >>> > > below required minimum [3]. Both 192,190 servers reported errors
on
> >>> > failure
> >>> > > to read information from 193.
> >>> > >
> >>> > > Please look for the time around 12:30-12:32 to find the relevant
> >>> logs.
> >>> > Let
> >>> > > me know if you need some other information.
> >>> > >
> >>> > >
> >>> > > Regards,
> >>> > > -Sameer.
> >>> > >
> >>> >
> >>>
> >>>
> >>>
> >>> --
> >>> -- Guozhang
> >>>
> >>
> >>
> >
>
>
> --
> -- Guozhang
>

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