Reindexing Ethereum Blocks: Is it possible to start from another file?

As an experienced Bitcoin and Ethereum user, I recently encountered a frustrating problem during my daily synchronization process. My Ethereum wallet complained about loading blocks from a damaged file that eventually led me to examine the possibility of obstacle from the disk but starting from another file.

Error Message

Here is an error message that appeared in my terminal:

`

Error: Unable to find a BLK00217.Dat or BLK0000.Dat file

`

At first glance, it seemed as a simple problem with loading full blocks from the disc. However, when I kicked deeper into the problem, I found that bitcoin-QT not only loaded whole blocks, but also tried to start synchronizing from BLK0000.Dat, which is a damaged file.

Understanding the re -indexing process

In order to understand what is happening, let’s dive into the basics of the re -exing of the Ethereum block. When you run EIP155dumper on your Bitcoin-QT wallet (or any other Ethereum knot), it generates a list of blocks that can be used to restore the blockchain to the previous state.

The re -indexing process involves loading these blocks from the disc and then rebuilding the blockchain. This is necessary because the blocks are not stored in memory, but rather on the disk where they are regularly updated by the network.

Reindexing from disk but not starting another file

Now we get to the meat of the problem: Starting an obstacle from Blk0000.Dat instead of loading full blocks from the disc. To achieve this, you will need to understand how bitcoins-QT loads and stores blocks on the disk.

The BLK0000.DAT file is used as a” ScraThpad “to load new blocks during reindexing. These are not real data about blockchain that are stored on the disk; Rather, it is a temporary cache that holds the latest block in the network.

When bitcoins-QT begins to reinforce, it loads this Scratchpad file (or in this case Blk0000.Dat) and uses its content to update the blockchain. The preindexed blocks are then written back to the disc, thereby renewing the blockchain to its previous state.

Solution: Reindexing from another file Scratchpad

As I have already mentioned, there is no direct way to start reinixing from another Scratchpad file (i.e. J. BLK0000.Dat). However, you can achieve a similar result with a different approach:

• Load the blocks from the disk using standardBlkfiles (eg BLK0010.Dat,BLK0020.Dat etc.).

• Create a new Scratchpad file (eg “Scrachpad.Dat) that contains the latest block data.

• UseScratchedon Reindex from this Scratchpad file.

If you want to use "scratched" you can follow these steps:

• Load the entire blocks from the disk usingBlk: BLK0010.Dat,BLK0020.Datetc.

• Create a new Scratchpad file (eg "Scrachpad.Dat) that contains the latest block data:

`

scratched -o scratches.Dat

`

• Launch Ethereum-QT with the updated Scratchpad file: EIP155DUMPER on your wallet.

• Start Reindexing from Scratchpad file using Reindex.

Conclusion

Although it is not possible to start preindecing from another Scratchpad file, you can bypass this limitation using standard “BLK” files and creating a new Scratchpad file that contains the latest block data. According to these steps, you should be able to achieve the desired result without you have to load full blocks from the disc.

Keep in mind that Reindexing is an ongoing process, so regularly check the condition of the blockchain and adjust your setting as needed. Happy tinkering!