SreeramGarlapati opened a new issue #2723:
URL: https://github.com/apache/iceberg/issues/2723
Am trying to understand how to configure an iceberg table for `low-latency`
writes. Here are my thoughts on how to configure it. Truly appreciate any
inputs.
### Supporting low latency writes to iceberg table entails the below
sub-problems:
1. **Optimizing the data payload:** optimizing the data payload to be
written to the table.
- **There is an Optimization that is specific to the write pattern**
1. **Appends:** in case of Appends - this is already solved - as
iceberg always writes the new new inserts as new files.
2. **Deletes (/Upserts):** in case of Deletes (or Upserts - which
are broken down into Insert + Delete in 2.0) - this problem is solved as well.
- **File Format**: There is another optimization knob useful at file
format level. It might not make sense to generate data in the columnar format
here - al the time and space spent for encoding, storing stats etc can be
saved. So, thankfully, for these low-latency writes with iceberg table - `AVRO`
file format can be used.
2. **Locating the records that need to be updated with low-latency:** In
case of Upserts - locating the records that need to be updated is the key
problem to be solved.
- One popular solution for this is to maintain indexes to support the
**equality filters** used for upserts. **Do you know if there is any ongoing
effort for this!?**
3. **Optimizing the Metadata payload**: for every write to Iceberg table -
the **schema file** & **manifest list** file are rewritten. To further push the
payload down - we can potentially write the "change set" here. Is this the
current direction of thought? If so, pointers to any any work stream in this
regard is truly appreciated.
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