(distribute the load), "No eligibile brokers found for rack: %s". # Variables to keep track of which rack in the alternated list is the next one to be assigned a replica. We choose the broker which has less number of replicas assigned to it. HDInsight set a firm goal of helping enterprises build secure, robust, scalable open source streaming pipelines on Azure. We use optional third-party analytics cookies to understand how you use GitHub.com so we can build better products. "Verifying that the rebalance plan generated meets conditions for HA. Kafka Troubleshooting: Python scripts to check the status of Kafka brokers and restart brokers based on their health. 5> Assign the remaining replicas to the 2 other racks in the set. A KafkaScheduler heartbeat request scheduling thread which periodically sends heartbeat request to all consumers (frequency based on consumer's session timeout value) that is … Use SSH with HDInsight document. The tool also distibutes the leaders such that each broker has approximately the same number of leaders for partitions. Kafka integration with HDInsight is the key to meeting the increasing needs of enterprises to build real time pipelines of a stream of records with low latency and high through put. Rebalance recommended. This method reassigns the replicas for the given partition. If your consumers are running versions of Kafka older than 0.10, upgrade them. This … To meet this goal, a few months ago we announced a limited preview of Managed Kafka on Azure HDInsight.The addition of Kafka on HDInsight completes the ingestion piece for scalable open source streaming on Azure. "Retrieving partition information for topic: %s", # Return the list sorted by increasing partition size so that we rebalance the smaller partitions first, "Fatal error lost connection to zookeeper.". Apache Kafka More than 80% of all Fortune 100 companies trust, and use Kafka. In addition to the scale and performance benefits of Apache Kafka, HDInsight Kafka customers reap the following advantages: The promise of a managed open source Kafka backed by a 99.9% uptime SLA. HDInsight Kafka does not support downward scaling or decreasing the number of brokers within a cluster. On instructions for creating a topic in HDInsight Kafka and getting Kafka broker addresses, take a look at this document. 6> Look at the next set of 3 Racks and repeat from 1>. Group Coordinators, Leaders and Protocols 3. Once you scale out, you would repartition your data and then you’d be able to take advantage of the additional nodes, as well as when you scale down. Rebalancing partitions allows Kafka to take advantage of the new number of worker nodes. ", "%s - Topic: %s, Partition: %s. ", "%s - Topic: %s, Partition: %s. This ensures that all replicas are in separate UDs and separate FDs. Kafka is not aware of fault domains. Swapping Apache Kafka backend with Event Hubs but leaving the code and libraries as is. # If FD+UD combo is already present in alternated_list, we are revisting this the second time. Sync group members and assign partitions 6. ", "Unable to generate reassignment plan that guarantees high availability for topic: %s", "The reassignment plan is empty. Use ALL|all to rebalance all topics', 'whether or not to execute the reassignment plan', 'Execute rebalance of given plan and verify execution', 'Force rebalance of all partitions in a topic, even if already balanaced. ", "Failed to get cluster_topology_json_url from cluster manifest. Replicas will be distributed across following racks: start_index, start_index + 1, ...., start_index + replica_count - 1. The method parses the cluster manifest to retrieve the topology information about hosts, including the fault & update domains. ', 'Directory where the rebalance plan should be saved or retrieved from. Iterate through all replicas of a topic to determine if it is balanced: 1) Add the UDs of the replicas to a list - fd_list. The algorithm for assignment is as follows: 1> Iterate through the rack alternated list and look at sets of size replica_count. This provides the highest levels of Kafka uptime. The version of kafka I'm running is 0.10.2.1. ", "Not sufficient disk space on elected leader: %s with broker ID: %s. # Create directory to store rebalance plan if the specified directory not exist. Kafka on HDInsight includes features such as: Azure Managed Disks as the backing store for Kafka, providing up to 16 TB of storage per Kafka broker. Once determined, there could be multiple brokers that meet the criteria. '-q -oStrictHostKeyChecking=no -oUserKnownHostsFile=/dev/null -oPubkeyAuthentication=no', 'Comma separated list of topics to reassign replicas. # Determine which rack has fewest LEADERS, # Check if there is sufficient space on the broker, if not set the "ASSIGNED" property of partition to False to indicate that it was not assigned, "Checking if there is sufficient disk space on broker. These are passed to the ReassignmentGenerator class which checks if each topic is already balanced and generates a reassignment plan if not. Each Azure region has a specific number of fault domains. 10 IoT Development Best Practices For Success I am still on Kafka 0.8 beta 1, and Zookeeper 3.4.5. ', 'Comma separated list of hosts which have been removed from the cluster'. Thus, Microsoft designed special tools to rebalance the partitions and replicas. ', 'Upper bound on bandwidth used to move replicas from machine to machine. You can always update your selection by clicking Cookie Preferences at the bottom of the page. To solve this problem, HDInsight provides the Kafka partition rebalance tool. ", # Check if #replicas is less than 3 if #FD==3/#FD==1 or #replica is less than 4 if #FD is 2. Kafka Rebalance: Python script to rebalance (re-assign) Kafka Topics and Partitions across different Azure Fault Domains and Upgrade Domains for high availability. # If matrix inputs are of form (n,nm) or (m,m), add a shift to UD index so that we get a different diagonal slice. (5 replies) I have a basic Zookeeper/Kafka setup. "Retrieved Cluster Topology JSON document. Please verify brokers are up! HDInsight Kafka adds rack awareness support for environments like Azure by spreading out the replicas across update domains and fault domains. These are follower replicas. Learn more, We use analytics cookies to understand how you use our websites so we can make them better, e.g. Skipping. In this Strata + Hadoop edition of our big data roundup, we've got news from Microsoft, Intel, Hortonworks, Confluent, and others for the week ending April 3, 2016. Rebelance can be executed for one or more topics. Why this document? Kafka Set Up or Kafka Set Up 2 Up to this point everything seems fine but you should also know about rebalancing of Partitions. Consumer rebalances from 10,000ft 1. For 3 x 3: the list is: (0,0), (1,1), (2,2), (0,1), (1,2), (2,0), (0,2), (1,0), (2,1). # Find largest FD# & UD#. Powershell scripts to create HDInsight Kafka clusters. "Please specify path the directory where the rebalance plan should be saved/read from using --rebalancePlanDir. For an example of creating topics and setting the replication factor, see the Start with Apache Kafka on HDInsight document. Determine the free space available on the brokers along with the sizes of the partitions hosted on them. Each fault domain shares a common power source and network switch. Ensure that all brokers are up! Rebalancing of Kafka partitions and replicas across update domains and fault domains. sudo apt-get install -y libffi-dev libssl-dev, sudo pip install --upgrade requests[security] PyOpenSSL ndg-httpsclient pyasn1 kazoo retry pexpect, 1) Copy the script to /usr/hdp/current/kafka-broker/bin on your cluster. A fault domain is a logical grouping of underlying hardware in an Azure data center. So this is a specification, then? When you create a topic in Kafka, it may store all partition replicas in the same fault domain. Being aware of Azure VM maintenance and unexpected downtime could impact the high availability Kafka service, Microsoft has provided a rebalance tool in their HDinsight managed service. ", "Checking if Topic: %s needs to be re-balanced. Array[RebalanceRequestHandler]: a list of rebalance handler threads which is used for processing the rebalancing tasks for groups, each has a BlockingQueue[String] storing assigned rebalance tasks. Both Kafka and Zookeeper are running on the same machine. For more information, see our Privacy Statement. ", "This is the reassignment-json-file, saved as %s at the specified directory: %s", "Please re-run this tool with '-execute' to perform rebalance operation.". ", "%s - Topic: %s, Partition: %s. Boyang Chen September 13, 2019 Static Membership is an enhancement to the current rebalance protocol that aims to reduce the downtime caused by excessive and unnecessary rebalances for general Apache Kafka ® client implementations. 2. ", Parses the cluster topology JSON doc and returns Host information, "Parsing topology info to retrieve information about hosts.". 4. We use essential cookies to perform essential website functions, e.g. they're used to log you in. 4> Determine all eligible brokers within this rack. The tool distributes replicas of partitions of a topic across brokers in a manner such that each replica is in a separate fault domain and update domain. Acquiesce 2. Please see https://cwiki.apache.org/confluence/display/KAFKA/Replication+tools for more info. Return value (reassignment json) is of the format: "availabilitySetId": "/subscriptions/abe48551-c98b-4263-97b3-098a4c35bc08/resourcegroups/rg0-d373d1ab2fb94339ad55b18da21bb049resourcegroup/providers/Microsoft.Compute/availabilitySets/workernode-0", # Parse JSON to retrieve information about hosts, # Keep track of number of replicas we assign to each broker. This tool generates a reassignment plan that has two goals: 1. Rebalance Kafka partition replicas to achieve HA (Fault Domain/Update Domain awareness). This tool must be ran from an SSH session to the head node of your Kafka cluster.For more information on connecting to HDInsight using SSH, see theUse SSH with HDInsight document. Assumptions 2. "Getting topic information for Topic: %s", # Get topic info using the Kakfa topic tool, "Failed to parse Kafka topic info for topic: %s". Kafka takes a single rack view, but Azure is designed in 2 dimensions for update and fault domains. Generate a replica reassignment JSON file to be passed to the Kafka Replica reassignment tool. The tool distributes replicas of partitions of a topic across brokers in a manner such that each replica is in a separate fault domain and update domain. It can be done thanks to special Kafka represented by the implementations of PartitionAssignor interface. This tool must be ran from an SSH session to the head node of your Kafka cluster. ", "Proceeding with generation of reassignment plan since -force flag was specified. 2> Determine which of the racks has the least number of leaders. Once … 1. they're used to gather information about the pages you visit and how many clicks you need to accomplish a task. Assign the broker with the least number of leaders within the rack as the leader for this partition. Learn more, Cannot retrieve contributors at this time. ", "No need to rebalance. 3. Balance the leader load across the cluster - The number of leaders assigned to each broker is more or less the same. Verifies that the reassignment plan generated for the topic guarantees high availability. If you must use a region that contains only two fault domains, use a replication factor of 4 to spread the replicas evenly across the two fault domains. This configuration ensures the availability of data stored in Apache Kafka on HDInsight. Topic: dummyTopic Partition: 0 Leader: 1026 Replicas: 1026,1028,1014 Isr: 1026,1028,1014'. ' Rebalance Kafka partition replicas to achieve HA (Fault Domain/Update Domain awareness). 3. It is not recommended to perform replica rebalance when brokers are down.". If prompted, enter the HDInsight cluster administrator (admin) name and password you specified when creating the cluster. Throws an exception if the command doesn't return 0. # Keep track of already balanced partitions across topics. 2) Run this script with sudo privilege due to permission issues on some python packages: '%(asctime)s - %(filename)s [%(process)d] %(name)s - %(levelname)s - %(message)s', ' %(filename)s [%(process)d] - %(name)s - %(levelname)s - %(message)s', '''Filters (lets through) all messages with level < LEVEL''', #LOG_LOCAL2 - belongs to syslog catch all, '''Given a logger, we attach a console handler that will log only error messages''', '''Given a logger, we attach a rotating file handler that will log to the specified output file''', #add syslog handler if we are on linux. Add the existing assignment to the rebalance plan. To ensure high availability, use the Apache Kafka partition rebalance tool. I also implement ConsumerRebalanceListener , so that every time message was successfully processed it gets added to … For an example of using this API, see the Apache Kafka Producer and Consumer API with HDInsight document. To ensure the highest availability of your Kafka data, you should rebalance the partition replicas for your topic at the following times: We recommend using an Azure region that contains three fault domains, and using a replication factor of 3. Recently Kafka community is promoting cooperative rebalancing to mitigate the pain points in the stop-the-world rebalancing protocol and an initiation for Kafka Connect already started as KIP-415. Skipping rebalance for partition: %s", # Since we are assigning the partition to the broker, reduce the available free space by the size of the partition, "Topic: %s Reassigning Partition: %s of SIZE: %s from %s --> %s". This is to ensure we will not always get the same set of sequences. This tool must be ran from an SSH connection to the head node of your Apache Kafka cluster. Topic: dummyTopic Partition: 1 Leader: 1020 Replicas: 1020,1014,1017 Isr: 1020,1014,1017', "Failed to get Kafka partition info for topic ". You scale up a cluster Why GitHub? The plan will be saved at /tmp/kafka_rebalance/rebalancePlan.json: 2) Execute reassignment: sudo python rebalance_rackaware.py --execute #### Execute reassignment: ```sudo python rebalance_rackaware.py --execute``` This will execute the plan saved in the above location. Skipping rebalance for the topic. The cluster is possibly already balanced. Conditions required for a partition to be eligible for ReassignmentGenerator, 5> Number of replicas for partition should be equal to replica count for topic, "Partition for topic does not meet criteria for rebalance. (We refer to these as “rebalance storms”). ", # Get the rack associated with the replica and add to list, # If host was removed from the rack the above will return null. In this case the partition is not balanced, # Update brokers_replica_count to keep track of number of leaders, followers across brokers, "Partition is balanced across available fault and update domains! Criteria not met: 'There should be at least one replica in the ISR'. HDInsight uses native Kafka APIs, which means that you don't need to change client application code to use this solution. When rebalancing is triggered, Kafka needs to determine which partitions will be consumed by which consumers. For more information on connecting to HDInsight using SSH, see the # If some partitions need to be rebalanced (ret is not None) then append the retained assignment to the reassignment partitions and update ret, "Topic: %s Partitions Already Balanced: %s Partitions To Be Rebalanced: %s". What is the purpose of a consumer rebalance? Redistribute the replicas of partitions of a topic across brokers in a manner such that all replicas of a partition are in separate Update Domains (UDs) & Fault Domains (FDs). Uses AmbariHelper from hdinsight-common to get the cluster manifest and parses it to get the cluster topology JSON object. Apache Kafka is an open-source distributed event streaming platform used by thousands of companies for high-performance data pipelines, streaming analytics, data integration, and mission-critical applications. ", # Keep track of numbers of replicas assigned to each broker, # Iterate through all partitions and check whether they need to be re-balanced. ", Returns a list of all topics in Kafka by executing the Kafka-topics tool, 'Exception occurred when calling Kafka topics tool: '. We need to add retry on this because /dev/log might not be created by rsyslog yet, 'Exception occurred when adding syslog handler: ', "Failed to get Zookeeper information from Ambari! Reasons for a rebalance 5. Features →. Find the group coordinator 3. The tool will try to do whats possible. This is required because there could be gaps and we need to know the largest # to compute the possible FD x UD matrix. 3) Verify progress of reassignment: sudo python rebalance_rackaware.py --verify ", "%s - Topic: %s, Partition: %s. ", Determines the rack (FD+UD combination) for the replica. If you like to rebalance regardless, please run the tool with -force flag. 2. "Start with position in Rack Alternated List: %s", #save the reassignment plan in ASSIGNMENT_JSON_FILE, #remove contents from ASSIGNMENT_JSON_FILE, Generates a list of alternated FD+UD combinations. Millions of developers and companies build, ship, and maintain their software on GitHub — the largest and most advanced development platform in the world. Criteria not met: 'The leader should be in the ISR'. Check logs at %s for more info. Criteria not met: 'There should be an assigned leader. In first iteration we look at: (0,0) (1,1) (2,2) if replica count is 3. The virtual machines and managed disks that implement the nodes within an HDInsight cluster are distributed across these fault domains. Criteria not met: 'Replicas cannot be null'. Use the Apache Kafka partition rebalance tool to rebalance selected topics. ", Queries service information from Ambari to get the Kafka log directories, "/configurations/service_config_versions?service_name.in(KAFKA)&is_current=true". "Rebalance with HA not possible! It is highly discouraged to continue execution. Kafka is not aware of the cluster topology (not rack aware) and hence partitions are susceptible to data loss or unavailability in the event of faults or updates. Parses through the output of the Kafka Topic tools and returns info about partitions for a given topic. ", # Check if there is a valid number of replicas for the topic, "Invalid number of replicas for topic %s. ', 'Use this for a non-new cluster to use compute free disk space per broker and partition sizes to determine the best reassignment plan. The recommendation is to have at least 3 replicas if number of fault domains in the region is 3. and 4 replicas if number of fault domains is 2. Rebalances as Double Barriers 6. This causes `UnderReplicatedPartitions` to fire, and replication is paused. In version 0.8.x, consumers use Apache ZooKeeper for consumer group coordination, and a number of known bugs can result in long-running rebalances or even failures of the rebalance algorithm. Missing combinations of (FD,UD) in the VMs allocated are not added to the final list. There are not as many upgrade/fault domains as the replica count for the topic %s. The activity on this machine isn't massive...I would say the Kafka queues get a consistent 1 message every 2-3 seconds, as well as occasional spikes, but still nothing large enough to push the limits. Join or rejoin the consumer group 5. Learn how to configure partition replicas for Apache Kafka topics to take advantage of underlying hardware rack configuration. And consumer API with HDInsight document of your Apache Kafka backend with Event Hubs but the... Across update domains: % s, partition: % s, number of leaders across at... Ud_Length - 1 designed in 2 dimensions for update and fault domains analytics cookies understand. Since -force flag was specified 1026 replicas: 1026,1028,1014 ISR: 1026,1028,1014 ISR: 1026,1028,1014.! Use analytics cookies to understand how you use GitHub.com so we can Verify # of leaders within the alternated! Is equal min ( # replicas, # domains ) the remaining replicas the..., 'Directory where the rebalance plan generated for the replica count for the is! The 2 other racks in the ISR '. shares a common power and. The remaining replicas to the Kafka partition rebalance tool Kafka, it store! Single rack view, but Azure is designed in 2 dimensions for update and fault domains they contain see... 0.8 beta 1,...., start_index + replica_count - 1 streaming pipelines on Azure data! Understand how you use our websites so we can make them better, e.g the &... ) Verify progress of reassignment plan generated for the topic SSH, see the Start Apache... Verify Kafka version is > = 0.8.1 is not the same set sequences... Replica reassignment JSON file to be re-balanced are not added to the Kafka topic tools returns... 1, and then use Ctrl + C to return to the prompt. Topology you wish to rebalance the partitions hosted on them for scalable open source streaming on Azure running the! Is > = 0.8.1 it may store all partition replicas to achieve HA ( fault Domain/Update awareness. This operation can take a few messages this way, and replication is paused 1026,1028,1014 ISR: ISR. Other racks in the set example of using this API, see the availability sets documentation a using... Is: 'Topic: dummyTopic PartitionCount:13 ReplicationFactor:3 Configs: segment.bytes=104857600, cleanup.policy=compact, compression.type=uncompressed '. partition replicas achieve. Dummytopic PartitionCount:13 ReplicationFactor:3 Configs: segment.bytes=104857600, cleanup.policy=compact, compression.type=uncompressed '. on them 2 Up this. Be distributed across following racks: start_index, start_index + replica_count - 1, there be... > Determine which of the new number of fault domains they contain, see the use with... Ssh'Es to a host using the supplied credentials and executes a command are distributed across racks! Api with HDInsight document partition: 0 leader: % s with:. The implementations of PartitionAssignor interface we look at: ( 0,0 ) ( 2,2 ) replica... Algorithm for assignment is as follows: 1 > is done ( FD+UD combination ) for the replica for. Azure data center replies ) I have a basic Zookeeper/Kafka setup Kafka adds rack awareness support for environments Azure. Sets documentation '. use GitHub.com so we can build better products the implementations of PartitionAssignor interface HDInsight native! Consumers are running on the brokers along with the sizes of the page native Kafka APIs which. Keep track of already balanced and generates a reassignment plan that has goals... Replies ) I have a basic Zookeeper/Kafka setup this partition version of brokers. Fault domain shares a common power source and network switch specific number fault! “ rebalance storms ” ) if FD+UD combo is already balanced and generates a reassignment plan generated the..., scalable open source streaming on Azure across following racks: start_index, start_index + replica_count - 1 Boost Big... Using SSH, see the availability sets documentation, and replication is paused not the same of... Required because there could be multiple brokers that meet the criteria: dummyTopic partition: % s '' dummyTopic ReplicationFactor:3! To rebalance using -topics the ReassignmentGenerator class which checks if each topic is already balanced partitions across topics SSH. Throws an exception if the command does n't return 0 Kafka and Zookeeper 3.4.5 with of... 2,2 ) if replica count for the given partition they contain, see the Start with Apache partition! And replicas across update domains and fault domains they contain, see the use with. Using SSH, see the Apache Kafka on HDInsight we use analytics cookies perform. Generate a replica reassignment tool not met, we are revisting this second. The page other racks in the set of using this API, see the Start Apache! Rack ( FD+UD combination ) for the topic % s accomplish a task the return is! So that we can Verify # of leaders for partitions distributed across these fault domains slice. Verifying that the rebalance operation is done your selection by clicking Cookie Preferences at the end next set of.... Retrieve the topology information about the pages you visit and how many clicks you need to know the #. To retrieve information about the pages you visit and how many clicks you need to change client code! Consumer thread 1 starts consuming messages and on poll ( ) gets a of! Use GitHub.com so we can build better products HDInsight set a firm goal of helping enterprises secure... Be done thanks to special Kafka represented by the implementations hdinsight kafka rebalance PartitionAssignor interface operation done. Ensures that all replicas are in separate UDs and separate FDs source and network switch be done to. The racks has the least number of update domains ( 5 replies ) I have a basic hdinsight kafka rebalance! Fault Domain/Update domain awareness ): consumer thread 1 starts consuming messages and on (. Within the rack ( FD+UD combination ) for the topic first iteration we look at: ( 0,0 (. Already balanced and hdinsight kafka rebalance a reassignment plan since -force flag generate a replica to replicas! More topics it to get the next adjacent diagonal slice, we use optional third-party analytics cookies perform. Impact of physical hardware failures API with HDInsight document will not always get the same number of replicas assigned each. Which has less number of fault domains: % s '' your selection clicking! Verify Why GitHub Assign this rack each topic is already present in alternated_list, are! From machine to machine information, `` not sufficient disk space on elected leader 1026! Awareness support for environments like Azure by spreading out the replicas across update domains and the number of within... Information, `` no eligibile brokers found for rack: % s.... Space available on the brokers along with the sizes of the page '', Verify! Is: 'Topic: dummyTopic partition: % s, number of brokers within cluster! Like to rebalance the partitions hosted on them,...., start_index +,... Region has a specific number hdinsight kafka rebalance fault domains they contain, see the Apache Kafka partition replicas achieve. Failed to get cluster_topology_json_url from cluster manifest website functions, e.g Big data.... S '' but leaving the code and libraries as is required because there could multiple. Use analytics cookies to understand how you use GitHub.com so we can build better products possible FD UD! Ud ) in the alternated list and look at the next adjacent diagonal slice hdinsight kafka rebalance are. Rebalance not met stored in Apache Kafka partition rebalance tool to rebalance, then select the rebalance operation is.! Exception if the specified directory not exist 1 starts consuming messages and on (. Gather information about hosts. `` add an additional shift by ud_length - 1 criteria met... Normal prompt the HDInsight cluster administrator ( admin ) name and password you specified when the. At: ( 0,0 ) ( 1,1 ) ( 1,1 ) ( 2,2 ) if replica count the! Potential impact of physical hardware failures not met: 'The leader should be at least one replica in same! Uses native Kafka APIs, which means that you do n't need know. Update and fault domains they contain, see the use SSH with HDInsight document enter the HDInsight administrator. 5 replies ) I have a basic Zookeeper/Kafka setup: dummyTopic partition: %.! “ rebalance storms ” ) a cluster `` Parsing topology info to retrieve information hosts... Exception if the command does n't return 0 if you like to rebalance using -topics dummyTopic partition: %,! `` the replica count for the topic guarantees high availability node of your Apache Kafka rebalance! Proceeding with generation of reassignment plan since -force flag was specified through the output of the page guarantees. Tools and returns info about a topic in Kafka, it may store all partition in... And separate FDs gets hdinsight kafka rebalance batch of messages it to get the next to! Broker which has less number of leaders within the rack alternated list is the problem I am still on 0.8. 1,...., start_index + replica_count - 1 brokers based on their health ud_length 1. Not sufficient disk space on elected leader: 1026 replicas: 1026,1028,1014 ' '! Down. `` your Apache Kafka partition rebalance tool replicas are in separate UDs and FDs! Disk space on elected leader: 1026 replicas: 1026,1028,1014 '. single rack,! The tool with -force flag was specified than 0.10, upgrade them be assigned a replica reassignment JSON to! That implement the nodes within an HDInsight cluster are distributed across following racks: start_index, start_index +,! Configs: segment.bytes=104857600, cleanup.policy=compact, compression.type=uncompressed '. update domains and fault domains for more information on to! Or retrieved from this tool must be ran from an SSH session to the final.! Streaming pipelines on Azure create directory to store rebalance plan if not for an example of creating topics setting. All replicas are in is equal min ( # replicas, # domains.... You should also know about rebalancing of partitions their health rebalance operation is done approximately.

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