What is storm?
Storm is a distributed real-time data processing framework that allows for the processing of large amounts of data in a fault-tolerant and scalable manner.
How do I install storm?
You can install storm by following the instructions provided on the Apache Storm website: https://storm.apache.org/releases.html
Why is my storm cluster not starting?
There could be a few reasons why your storm cluster is not starting, some possible reasons include incorrect configuration, software conflicts, or network issues. Check your storm logs for any error messages that may help identify the issue.
How can I increase the spout parallelism in storm?
You can increase the spout parallelism by setting the "spout.parallelism" property in your storm configuration file. This will increase the number of concurrent tasks running for the spout.
What is a topology in storm?
A topology in storm is a directed acyclic graph (DAG) of spouts and bolts that define how data will be processed in your storm cluster.
Why are my bolts not receiving any tuples?
There could be a few reasons for this issue, such as incorrect configuration, issues with spout parallelism, or data manipulation errors. Check your storm logs for any error messages that may help identify the issue.
How do I add a new spout or bolt to my topology at runtime?
You can use the "addSpout" or "addBolt" method in the TopologyBuilder class to dynamically add a new component to your topology while it is running.
What is the best way to debug my storm topology?
You can use the "LocalCluster" mode to run storm on your local machine and debug it using standard debugging tools. You can also enable debug logging in your storm configuration file to get more detailed information about your topology's execution.
How can I set the message timeout for a particular spout or bolt in my topology?
You can use the "setMsgTimeoutSecs" method in the SpoutOutputCollector or BoltOutputCollector classes to set the message timeout for a specific component in your topology.
How do I monitor my storm cluster?
You can monitor your storm cluster using the storm UI or by enabling JMX monitoring in your storm configuration file. You can also use external monitoring tools like Ganglia or Nagios.
Why am I getting a "NotEnoughReplicasException" error in my storm cluster?
This error occurs when there are not enough replicas of a particular component in your cluster to process the required data. Check your storm configuration to ensure the correct number of replicas are specified.
How do I upgrade storm to a newer version?
You can upgrade storm by following the instructions provided on the Apache Storm website: https://storm.apache.org/releases.html#Upgrade_from_an_earlier_version
How can I handle failures in my storm topology?
You can handle failures in your storm topology by implementing a custom "acker" component that tracks the status of tuples and handles retries for failed tuples.
What is the difference between an offset commit and a tuple ack in storm?
An offset commit is a Kafka-specific operation that marks a particular message as processed, while a tuple ack in storm indicates acknowledgement of a tuple being successfully processed.
How do I integrate Kafka with storm?
You can integrate Kafka with storm by using the "storm-kafka" and "storm-kafka-client" dependencies in your project and setting up the required configuration.
Why is my storm topology not reading from Kafka?
There could be a few reasons why your storm topology is not reading from Kafka, such as incorrect configuration, network issues, or Kafka server errors. Check your storm logs and Kafka logs for any error messages that may help identify the issue.
What is the best way to scale my storm cluster?
The best way to scale your storm cluster is to add more worker nodes or increase the resources allocated to your existing worker nodes. You can also tune the parallelism and concurrency settings in your topology to achieve better performance.
How do I configure storm to submit topologies to a remote cluster?
You can configure storm to submit topologies to a remote cluster by setting the "storm.local.mode" property to false and specifying the remote cluster's configuration in the storm.yaml file.
Why is my storm topology not processing data as fast as expected?
There could be a few reasons for this, such as resource limitations, data skew, or bottlenecks in your topology's processing flow. Check your storm logs and monitor your cluster's resource usage for any potential issues.
How do I handle schema changes in my storm topology?
You can handle schema changes in storm by implementing a custom serializer/deserializer for your data or by using a schema registry tool like Apache Avro or Apache Thrift.
What is a backpressure timeout error in storm?
A backpressure timeout error occurs when a component in your topology is waiting for data from another component, but the data is not received within the timeout period. This could be due to overloaded components or network issues.
How do I set the message timeout for a spout or bolt in storm?
You can use the "setMsgTimeoutSecs" method in the SpoutOutputCollector or BoltOutputCollector classes to set the message timeout for a specific component in your topology.
Why is my storm topology not acknowledging tuples?
The most common reason for this issue is that the tuple's "ack" method is not being called within the tuple timeout period, resulting in a "fail" by default. Ensure that your bolts are correctly acknowledging tuples in your topology.
How can I handle duplicate tuples in storm?
You can handle duplicate tuples in storm by implementing a custom de-duplication mechanism in your bolts or by using the "Distinct" stream operation to remove duplicates in your topology.
What is Trident in storm?
Trident is a high-level abstraction layer built on top of the storm core that provides a more declarative and fault-tolerant approach to building real-time data processing applications.
How can I convert an existing storm topology to use Trident?
To convert an existing storm topology to use Trident, you will need to modify your existing topology's spouts and bolts to use Trident components like "TridentSpout" and "TridentBolt" instead.
How can I create a topology using Java in storm?
You can create a topology using Java in storm by using the storm Java API and following the basic topology creation steps outlined in the storm documentation: https://storm.apache.org/releases/current/Tutorial.html
Why is my storm topology not emitting tuples to the next component?
This could be due to incorrect tuple routing or errors in your tuple's field names. Check your bolt's emission code and ensure that the emitted tuple's field names match the expected names in the topology.
