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| Title | Views | Posted |
|---|---|---|
| 296 | 05-06-2026 09:16 AM | |
| 483 | 05-04-2026 05:20 AM | |
| 354 | 05-01-2026 10:15 AM | |
| 522 | 03-23-2026 05:44 AM | |
| 392 | 02-18-2026 09:59 AM |
11-02-2022
10:28 AM
@Bridewin To add some additional context around your Cron schedule. NiFi uses Quartz Cron in case you were not already aware. Your current Quartz cron "0 05 8 1/1 * ? *" means that the processor will be scheduled to execute at 8:05am starting day 1 of every month and every subsequent day after day 1 in each month. The issue with this cron is when you start your GetFile on any day other than the 1st prior to 8:05am. Let's say you start NiFi on November 3rd. On startup NiFi loads your flow and starts all your component processors. In this configuration your GetFile will not get scheduled until December 1st and then at that point continue to execute everyday there after. If you stop and start the processor even without a NiFi restart, the same would happen. If NiFi restarts the JVM, same will happen. I am not clear on why you decided to add 1/1, perhaps this is how you intended for it to be scheduled? To truly have it get scheduled at 8:05am everyday starting the very day the processor is started (whether via user action or NiFi JVM restart), you would want a cron like "0 5 8 * * ? *" For more info on QuartZ Cron, review this link: https://productresources.collibra.com/docs/collibra/latest/Content/Cron/co_quartz-cron-syntax.htm If you found that the provided solution(s) assisted you with your query, please take a moment to login and click Accept as Solution below each response that helped. Thank you, Matt
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11-01-2022
12:36 PM
@Jagapriyan Since you are using the Listing Strategy "Tracking Timestamps", the configuration property "Entity Tracking Time Window" is not used. The "Tracking Timestamps" strategy is very dependent on timestamps of the target files. Typically when files are not being picked up it is because the timestamps on those files are equal to or less than the last recorded timestamp in the ListSFTP processors state. This can happen when files in the SFTP server target folders do not have their last modified timestamp updated (for example moving a file from another directory into a SFTP server directory. A copy would update the timestamp since the file is being written again). - Does your target SFTP path have multiple sub-directories which are being searched? Is Search Recursively set to "true"? - Are there symlink directories in use? - Have you looked the the state recorded timestamp for your SFTP server directories? Are your missed files having older timestamps? - How many files average are being written to the target SFTP between 12am and 1am each day? I also see you have min file age of 5 minutes. This means the last Modified timestamp must be 5 minutes older than the execution time of your processor for the file to be eligible for consumption. I see you stated your files are placed in the SFTP server between 12am - 1am each day and you scheduled your ListSFTP processor using a cron schedule at 10 minutes and 1 second every hour between 2am and 2pm. Why not just have your listSFTP processor run all the time? Is this because timestamps are not being updated consistently? If you switch to using the listing strategy "Tracking Entities" instead, do you still see the issue? Tracking entities works when there is issues with timestamps and was developed for that reason. If you found that the provided solution(s) assisted you with your query, please take a moment to login and click Accept as Solution below each response that helped. Thank you, Matt
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11-01-2022
12:02 PM
@Bridewin Are all your environments using NAS storage location from which the GetFile is pulling files? Have you monitored the health and connectivity of your NAS. Since you have your GetFile only scheduled to execute once a day, if your NAS or network is having issues, it simply will return nothing for that days execution. Since you are configured to remove the file you are consuming, have you tried to change yoru cron to run multiple times within the 8am hour to see if it gets picked up by any one of those executions? Perhaps if you are having network issues occasionally impacting your NAS, this will resolve your issue with consuming the file. If you found that the provided solution(s) assisted you with your query, please take a moment to login and click Accept as Solution below each response that helped. Thank you, Matt
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10-25-2022
07:29 AM
@PepeClaro While NiFi supports parallel thread execution, there is no way to guarantee that two threads execute at the exact same time. So one NiFi component processor is unaware of what another NiFi Component processor is doing or when it is executing. Processors that have an inbound connection on them use an inbound connection queued FlowFile as the trigger to perform start execution. Step 1 is to identify what NiFi component processors can be used to perform/execute your 3 processes: https://nifi.apache.org/docs.html I have no idea form your description what your 3 processes do, so I can't make any recommendations on what you can/should use. Step 2 is deciding how to interconnect these NiFi processor component and preserve data needed for downstream dataflow processing in your third process. When a processor executes the response/return from the execution can result in modification to existing NiFi FlowFile's content, Creation of new FlowFile content, Creation of an entirely new FlowFile, Creation of new FlowFile attributes (key/value pairs), modification of FlowFile attributes, or none of the above depending on the NiFi component processor being used. Since you mention that first 2 processes get info that is needed by process 3, so would need to take that into consideration for process 3. Where is that info go ing to end up (FlowFile Content or FlowFile attributes)? How large is that info returned (does it make sense to put it in to attribute)? Does that returned info need to be modified in any way before process 3? In your Flow as described, you have two Process Groups (PG), Each of these PGs performs your process 1 and process 2. Each will be executing independent of the other and thus can not guarantee execution at the exact same time. Cron scheduling of a processor can give a better chance of same time execution but still not a guarantee since it only schedules when to request an available thread from the NiFi Max Timer Driven Thread pool. If at time of request all threads are in use, it will execute as soon as thread becomes available. Now out of these two PGs you will have two FlowFiles that your third process depends on. There is no way to tell a NiFi processor component to pull attributes or content from two different FlowFiles source FlowFiles. So before process 3 you need to combine any needed attributes and or content from the two original FlowFiles into one FlowFile that Process 3 can use. Hard to make a recommendation here since I don't know any details about your 3 processes, what the FlowFiles that are produced by Process 1 and 2 contain in terms of content and attributes, and what content and/or attributes from process 1 and 2 are needed by process 3. I made suggestion about maybe being able to use the "defragment" merge strategy from the MergeContent processor to combine the FlowFiles from process 1 and process 2, but not enough detail to say or say without needing to do other modification before MergeContent. To "defragment" (combine process 1 fragment with process 2 fragment), the FlowFiles produced by both process 1 and process 2 would need to have the following FlowFile attributes present and set correctly on each: Name Description fragment.identifier Applicable only if the <Merge Strategy> property is set to Defragment. All FlowFiles with the same value for this attribute will be bundled together. fragment.index Applicable only if the <Merge Strategy> property is set to Defragment. This attribute indicates the order in which the fragments should be assembled. This attribute must be present on all FlowFiles when using the Defragment Merge Strategy and must be a unique (i.e., unique across all FlowFiles that have the same value for the "fragment.identifier" attribute) integer between 0 and the value of the fragment.count attribute. If two or more FlowFiles have the same value for the "fragment.identifier" attribute and the same value for the "fragment.index" attribute, the first FlowFile processed will be accepted and subsequent FlowFiles will not be accepted into the Bin. fragment.count Applicable only if the <Merge Strategy> property is set to Defragment. This attribute must be present on all FlowFiles with the same value for the fragment.identifier attribute. All FlowFiles in the same bundle must have the same value for this attribute. The value of this attribute indicates how many FlowFiles should be expected in the given bundle. segment.original.filename Applicable only if the <Merge Strategy> property is set to Defragment. This attribute must be present on all FlowFiles with the same value for the fragment.identifier attribute. All FlowFiles in the same bundle must have the same value for this attribute. The value of this attribute will be used for the filename of the completed merged FlowFile. Fragment.identifier, fragment.count, and segment.original.filename need to have same values on both FlowFiles. Fragment.index would be unique. The result would be one output FlowFile with the FlowFile content of both original process 1 and process 2 FlowFiles which process 3 could the use. Or if process 1 and 2 produce FlowFiles with just FlowFile Attributes you need and not content, you could set "Keep All Unique Attributes" as the attribute strategy so that the 1 merged FlowFile has all unique attributes form both source FlowFiles for process 3 to use. If you found that the provided solution(s) assisted you with your query, please take a moment to login and click Accept as Solution below each response that helped. Thank you, Matt
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10-24-2022
09:35 AM
@PepeClaro Your description is vague which makes it difficult to provide suggestions around incorporating them into a dataflow design. - What are these three "processes"? - How are those processes being executed? What processors in use for these 3 processes? - Are there any dependencies between these processes other then order of execution? For example, is output from processes 1 and/or 2 needed by process 3? - Do processes 1 and 2 need to be executed in parallel? - Is your NiFi a multi-node cluster? - What are the triggers for these processes? Does it require a NiFi FlowFile to trigger each processes? What kicks off this entire process dataflow? The more detail the better would be helpful. You may be able to set a fragment identifier, fragment count (2), and fragment index (1 or 2) for the first two process FlowFiles and then merge those fragments into one FlowFile that can trigger the third process. If either fragment is missing it will not merge and thus not trigger the 3 process. If not needing process 1 and 2 in parallel, then a single dataflows process1 --> process 2 --> process 3 where a failure anywhere along the dataflow prevents execution of next process. If you found that the provided solution(s) assisted you with your query, please take a moment to login and click Accept as Solution below each response that helped. Thank you, Matt
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10-24-2022
09:13 AM
@D5ha Sometimes it is useful to know more about your environment to include the full NiFi version and java versions. Since it is reporting issues as loading the flow: java.lang.Exception: Unable to load flow due to: java.util.zip.ZipException: invalid stored block lengths
at org.apache.nifi.web.server.JettyServer.start I would lean towards some issue/corruption of the flow.xml.gz and/or flow.json.gz on this node. Since all nodes run the same exact copy of these files, I'd copy them from a good node to the node failing to start. Depending on your NiFi version you may not have a flow.json.gz file (This format was introduced in the most recent versions). If you found that the provided solution(s) assisted you with your query, please take a moment to login and click Accept as Solution below each response that helped. Thank you, Matt
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10-24-2022
08:59 AM
@MrBurns You want to take the URL that written to the FlowFile's attribute "http.request.uri" and generate a Json, correct? Where do you want to write that JSON (a new FlowFile attribute? Content of the FlowFile?)? There are multiple ways to handle this. If you just want to write JSON to a new FlowFile Attribute, you could use the "Advanced" UI of the UpdateAttribute by setting up a rule for each url type. If you want to write to the content of a FlowFile, you could follow the above UpdateAttribute with a replaceText processor that does an "always replace" to write the json from the attribute to the content of the FlowFile. another option here is to use a RouteOnAttribute to route each url type to a unique ReplaceText to handle the specific url type. I like first option since you can easily add new rules to the UpdateAttribute if any additional URL types are introduced without needing to modify the rest of your dataflow. If you found that the provided solution(s) assisted you with your query, please take a moment to login and click Accept as Solution below each response that helped. Thank you, Matt
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10-24-2022
07:35 AM
@D5ha Your issue here is with the certificate being used to perform the clientAuth action. Your certificate would also not work if you had a multi-node cluster. It is only working as single node cluster because there are no other nodes for which your single node need to communicate as a client. The keystore requirements for NiFi are as follows: 1. keystore MUST contain ONLY one PrivateKeyEntry 2. PrivateKeyEntry MUST have both clientAuth and ServerAuth ExtendedKeyUsage (EKU) 3. PrivateKeyEntry MUST have a SubjectAlternativeName (SAN) entry that matches the NiFi node's server hostname. If you are also going to be addressing your server by its IP, you should have that IP as a SAN entry as well. Any other alternative hostname this server may be known as (meaning user type that alternate hostname in a URL to reach this host) should also be added to SAN. In your case, the current issue happens in the mutual TLS handshake. You have configured your SiteToSiteBulletinReportingTask to send to https://<some ip>/nifi. The same NiFi server receive that client hello and responds with a server hello back which includes the SAN entries. In your case the client (reporting task) looks at that server hello and basically rejects the handshake at that point in time. It does this because of what looks like a man-in-the-middle attack. The client tried to reach host <some ip> but instead a host with san <localhost> responded. There is no configuration change you can make in your secured NiFi to get around this. You'll need to get a new certificate meeting that above min criteria I outlined. You'll need t do this also if you ever intend to add more hosts to your NiFi cluster. If you found that the provided solution(s) assisted you with your query, please take a moment to login and click Accept as Solution below each response that helped. Thank you, Matt
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10-21-2022
01:25 PM
@DGaboleiro I am a bit confused by yoru dataflow design. In a NiFi multi-node cluster, each node is only aware of and can only execute upon FlowFiles present on that one node. So in your Dataflow you have the QueryCasandra processor executing on "primary node" only as you should (having it execute on all nodes would result in both your nodes performing same query and returning same data). You then Split that Json and use a DistributeLoad processor for what appears to me as means to then send some FlowFIle to node 1 and other half to node 2. This is not the best way to do this. You are running Apache NiFi 1.17 which means that load balanced connections are possible that can accomplish the same without all these additional processors. https://nifi.apache.org/docs/nifi-docs/html/user-guide.html#settings After your FlowFiles (this is what is being moved from processor to processor on your canvas) have been distributed I see that you are a MergeContent processor. The MergeContent processor can only merge the FlowFiles present on the same node. It will not merge FlowFiles from multiple nodes to a single FlowFile. So if your desire is to have one merge of all FlowFiles, distributing them across multiple nodes will not give you that desired outcome. You should never configure any processor that accepts an inbound connection for "primary node" only execution. This is important since which node is elected as primary node can change at anytime. Execution strategy has nothing to do with the availability of FlowFiles on each node on which to execute. What is important to understand is that each node in yoru NiFi cluster has its own copy of the Flow, its own set of Content and FlowFile repositories contain unique data, and each nodes executes the processors in its flow with no regard of the existence of other nodes. A node is simply aware from Zookeeper if it has been elected as the cluster coordinator and/or primary node. If it is elected primary node, it will execute "primary node" and "all nodes" components. If it is not the primary node, it will only execute the "all nodes" components. If you found that the provided solution(s) assisted you with your query, please take a moment to login and click Accept as Solution below each response that helped. Thank you, Matt
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10-21-2022
12:56 PM
@rangareddyy What is important to understand is that the NiFi component processors are not being executed by the user authenticated (assuming secured NiFi) into NiFi, but rather by the NiFi service user. So let's say that your NiFi service is owned by a "nifiservice" linux account. Whatever umask is configured for that user will be applied to directories and files create by that user. Now if your script is using sudo, it is changing the user that executes your script resulting in different user ownership and permission from the "nifiservice" user. Subsequent component processors will also execute as the "nifiservice" user and then not have access to those files and directories. So you'll need to take this in to account as you built your scripts. Make sure that your scripts are adjusting permissions on the directory tree and files as needed so your "nifiservice" user or all users can access the files needed downstream in your dataflows. So in yoru case it sounds like your script executed by ExecuteScript processor is creating a sh file not owned by the "nifiservice" user or does not have execute permission set on it. The ExecuteStreamCommand processor will attempt to execute the sh command on disk as the "nifiservice" user only. If you found that the provided solution(s) assisted you with your query, please take a moment to login and click Accept as Solution below each response that helped. Thank you, Matt
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