storm-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Spico Florin <spicoflo...@gmail.com>
Subject Re: If tuples come in too fast for bolts to process, does Zookeeper keep it in a queue?
Date Fri, 06 May 2016 06:29:51 GMT
Hello!
  If you have a look at the last line of your log you can see:
java.lang.OutOfMemoryError: *GC overhead limit exceeded*
 So you don't have enough memory for your worker. This is the reason that
the connection of the worker to ZoooKeper dies. The worker sends heartbeats
to ZK. If worker dies then no heartbeat to ZK. Therefore you have
connection timeout.
You can increase the JVM memory by setting up this via Config
property topology.worker.childopts . Config *conf.setProperty("*
* topology.worker.childopts**", "-Xms1G -Xmx1G").* This is to set up you
JVM heap memory.


To answer your question: *Does Zookeeper store a queue of unprocessed
tuples until the Bolts are ready to process them?*
*No.* Storm has internal queues to buffer the tuples. It is using a LMAX
disruptor queues to send/receive tuples from collocated JVM executors
(spouts and bolts) and different incoming/outgoing queues for
receiving/sending tuples to external workers (JVM).
Please have a detailed description here.
http://www.michael-noll.com/blog/2013/06/21/understanding-storm-internal-message-buffers/

I hope that these help.
 Regards,
 Florin






On Fri, May 6, 2016 at 8:22 AM, Navin Ipe <navin.ipe@searchlighthealth.com>
wrote:

> Hi,
>
> I have a topology where if a spout emits 1 tuple, a Bolt-A takes that
> tuple and emits 20 tuples. The next Bolt-B takes Bolt-A's tuples and emits
> 50 more tuples for each of Bolt-A's tuples. Tuples are always anchored.
>
> *Question:*
> When a light-weight spout emits a few tuples and Bolt-B has to process an
> exponential number of tuples, Bolt-A and B will receive tuples faster than
> they can process it. Does Zookeeper store a queue of unprocessed tuples
> until the Bolts are ready to process them?
>
> *Reason I'm asking:*
> Because I get a session timeout when I run a single instance of the bolts.
> When I increase the parallelism and tasks to 5, it runs longer before
> timing out. When I increase it to 15, it runs even longer before timing out.
>
> *The various error messages:*
> 587485 [main-SendThread(localhost:2001)] INFO  o.a.s.s.o.a.z.ClientCnxn -
> Client session timed out, have not heard from server in 13645ms for
> sessionid 0x154846bbee00003, closing socket connection and attempting
> reconnect
>
> 599655 [main-EventThread] INFO  o.a.s.s.o.a.c.f.s.ConnectionStateManager -
> State change: SUSPENDED
>
> 614868 [main-SendThread(localhost:2001)] INFO  o.a.s.s.o.a.z.ClientCnxn -
> Opening socket connection to server localhost/0:0:0:0:0:0:0:1:2001. Will
> not attempt to authenticate using SASL (unknown error)
>
> 614869 [main-SendThread(localhost:2001)] INFO  o.a.s.s.o.a.z.ClientCnxn -
> Socket connection established to localhost/0:0:0:0:0:0:0:1:2001, initiating
> session
>
> 607952 [SessionTracker] INFO  o.a.s.s.o.a.z.s.ZooKeeperServer - Expiring
> session 0x154846bbee00003, timeout of 20000ms exceeded
>
> 621928 [main-EventThread] WARN  o.a.s.c.zookeeper-state-factory - Received
> event :disconnected::none: with disconnected Writer Zookeeper.
>
> 627967 [Curator-Framework-0] WARN  o.a.s.s.o.a.c.ConnectionState -
> Connection attempt unsuccessful after 25535 (greater than max timeout of
> 20000). Resetting connection and trying again with a new connection.
> 627967 [timer] INFO  o.a.s.c.healthcheck - ()
>
> 631511 [ProcessThread(sid:0 cport:-1):] INFO
> o.a.s.s.o.a.z.s.PrepRequestProcessor - Processed session termination for
> sessionid: 0x154846bbee00008
> 631511 [main-SendThread(localhost:2001)] INFO  o.a.s.s.o.a.z.ClientCnxn -
> Opening socket connection to server localhost/127.0.0.1:2001. Will not
> attempt to authenticate using SASL (unknown error)
> 590891 [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2001] WARN
> o.a.s.s.o.a.z.s.NIOServerCnxn - caught end of stream exception
> org.apache.storm.shade.org.apache.zookeeper.server.ServerCnxn$EndOfStreamException:
> Unable to read additional data from client sessionid 0x154846bbee00006,
> likely client has closed socket
>
> 635140 [Curator-Framework-0] WARN  o.a.s.s.o.a.c.ConnectionState -
> Connection attempt unsuccessful after 32485 (greater than max timeout of
> 20000). Resetting connection and trying again with a new connection.
>
> 625190 [Curator-Framework-0] ERROR o.a.s.s.o.a.c.ConnectionState -
> Connection timed out for connection string (localhost:2001/storm) and
> timeout (15000) / elapsed (18942)
> org.apache.storm.shade.org.apache.curator.CuratorConnectionLossException:
> KeeperErrorCode = ConnectionLoss
>
> 643572 [Curator-ConnectionStateManager-0] INFO  o.a.s.zookeeper -
> 192.168.0.101 lost leadership.
>
> 678900 [Thread-79-GenBolt-executor[29 29]] ERROR o.a.s.util - Async loop
> died!
> java.lang.OutOfMemoryError: *GC overhead limit exceeded*
>     at java.lang.Long.valueOf(Long.java:840) ~[?:1.8.0_73]
>
> --
> Regards,
> Navin
>

Mime
View raw message