Re: Free Download Tombstone
Mina Spartin
DOIs are persistent identifiers (PIDs), which means that they are intended to be a permanent means of identifying and accessing a particular resource. Because of this, a DataCite DOI cannot be deleted. However, there may be infrequent cases where it is not desirable for the item described by a DOI to be available publicly, such as in the case of research retraction. In these cases, it is best practice to still provide a "tombstone page", which is a special type of landing page describing the item that has been removed. Tombstone pages are generally the responsibility of the organization responsible for maintaining the DOI (in other words, a DataCite Repository).
In general, the Best Practices for DOI Landing Pages still apply. The tombstone page should provide a full bibliographic citation so that users can verify they have found the correct item (or its last resting place). The tombstone page should contain the DOI itself in both a human-readable and machine-readable format. The only exception is that the user does not need to be able to access the item directly from the landing page, since that item has been removed.
It is best to include a statement of unavailability that details the circumstances that led to the current situation. It should be clear to users that the item being described is in fact associated with the DOI they tried to resolve, but that item is now no longer available. Including a reason for the item's removal is helpful for users.
A tombstone page should be created whenever the item a DOI describes is no longer available, for whatever reason. In general, however, it is better to avoid creating a situation in which a DOI's item is removed, if at all possible. This means being very careful not to accidentally create DOIs, or to put safeguards in place so that users of your repository are not able to accidentally create DOIs. Adjusting your workflow to make better use of Draft state could help with such problems. See DOI States for more information.
Your repository software platform may have a way to help you create tombstone pages, or you may be able to create such pages with the help of your institution's IT department, so you should explore these options first. A tombstone page specific to the removed item is more helpful for users discovering your content.
In the unlikely situation where the content of a DOI is no longer available and the responsible DataCite Repository or Member does not have the resources to create an appropriately specific tombstone page, they may instead update the DOI metadata for the removed item to point to this generic tombstone URL:
All older records are tombstone records. So, there is a huge amount of tombstone records that are not deleted although delete.retention.ms is one day. The *000.log and *937.log files include only tombstones and also the timestamps of these files are very old.
First of all, what do your keys look like? It would be very helpful to know the keys of the messages that you posted with offsets. I ask because in compacted topics, the topic is guaranteed to keep at least one value per key.
I think my use case is simple. I want at least the last record of one key beeing saved until I delete the key with a tombstone (delete marker) record. In this case I also expect that the tombstone record will be deleted after delete.retention.ms (and other necessary conditions like inactive file segments or min.cleanable.dirty.ratio are fulfilled).
Each keys will be deleted by a tombstone record in my use case sooner or later and data with new keys will appear. The fact that all data for deleted keys disappear at some point is critical for my use case, because otherwise the topic is filled up too much with delete marker records.
delete.retention.ms does apply to compacted topics, e.g. ones with log.cleanup.policy = compact. delete.retention.ms does not apply to non-null messages in a compact topic, but a tombstone message for a given key will be kept around until delete.retention.ms has passed.
This is helpful in the even that consumers go down. Imagine we have a consumer that reads from a topic and updates some internal state (that is safely stored locally), e.g. a count of times it sees a message for a given key. Suppose that when the consumer reads a tombstone message, it should remove that entry from the state, resetting the counter; otherwise, it increments the counter.
Thanks @danicafine for clarification. So the expectation is that tombstone records will be deleted sooner or later (also the last tombstone of a key). This is not the case for me (Kafka 2.6). Possibly this is a bug in Kafka (KAFKA-8522 ). I think I will have to evaluate it in a Kafka update.
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Last Sunday morning, at 8:25 AM, I stood at Gate B5 in Memphis, Tennessee, tears streaming down my face as I watched my flight home to New York take off. I had been delayed by weather on a connecting flight from Nashville, and had arrived to the gate just two minutes after the doors had closed. So I watched the plane leave, standing there, knowing that I would be re-routed through Atlanta now and instead of getting home before noon, I wouldn't be home until 5PM. I would miss the entire weekend with my family, and I was devastated.
I had begrudgingly accepted a business trip to Nashville even though it was a Wednesday through a Saturday because it was an excellent opportunity with an important business partner. And although weekends were typically sacred with my family, I had decided to sacrifice Daddy-daughter Saturday morning dance class this time, knowing I'd be home Sunday morning.
But when I missed that flight, I missed camp orientation, and had lost the entire weekend with my kids. I fell apart emotionally. I felt so disappointed in myself. I felt so out of control. I felt like I had made a really bad decision to not be home for a weekend. I felt like the worst dad in the world.
During the next seven hours of travel, I had a lot of time to think and reflect upon my priorities. I thought about my incredible day with the late, great Senator Frank Lautenberg, who taught me that my greatest legacy would be my children. I thought about the famous quote from John Crudele: "How do children spell LOVE? T-I-M-E." I thought about my priorities.
It's easy to get caught up in our hectic careers. It's easy for men and women to become "busy" trying to advance up the ladder at work or build a successful company. It's easy to check your email, take that meeting or call, or attend that networking event the boss invited you too. It's all too easy to skip the family dinner in the name of helping to put dinner on the table.
Somehow, it's more difficult at times to say "no" to our client or boss than it is to say "no" to our children. But as Senator Lautenberg taught me, your career highlights won't be on your tombstone. Your kids' names will be.
I have a lot of career goals and dreams. I want to build meaningful companies that change the world. I want to one day run for public office. I want to teach, to speak, to invest and to inspire. But I'm not willing to sacrifice weekends with my kids.
That's my choice, and of course it's your choice to pursue your career and your goals and dreams as vigorously as you'd like. But my hope, as we approach Father's Day in the US, is that you'll find it a little bit easier to say no to that next weekend conference, evening networking event, or breakfast meeting. My hope is that you'll find it easier to say yes to the kids. Just think about that eventual deathbed or tombstone, and how you'll feel one day looking back.
By the way, while I was devastated to miss the whole weekend with the kids, I'm proud to report that I canceled three evening work activities this week, to spend those evenings with my daughters. The week culminated in an excellent game of RISK, pictured above. And the only world I needed to take over was two little girls' world.
Now it's your turn. How do you balance your career with your family? How do you determine what to say "Yes" to and what to say "No" to at work? What kind of father (or mother) do you want to be remembered as? Please let me know your thoughts in the Comments section below. And please do share this post with the fathers (and mothers) in YOUR network.
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Yes, deletion of the whole partition creates a special type of the tombstone that "shadows" the all data in the partition. But like the other tombstones, it's kept for gc_grace_seconds, and only after that collected.
As mentioned you can update gc_grace_seconds to 0 but I wouldn't recommend that unless you only have one node in your cluster or that your RF=1. You could try to reduce GC grace to an acceptable time for you. I'd like to put the maximum time I think a Cassandra node could stay down.
An other option to immediately releasing space is to change your data model to use truncate/drop. For instance if you only need your data for 24h you could create one table per day and at some point drop the tables that you don't need.
After each stage was executed nodetool flush & nodetool compact but tombstone from stage 2 was't evicted as shown by sstablemetadata. After delete was executed new insert. I was hoping that Cassandra has optimizations for such cases.
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