Prasanth Jayachandran created HIVE-19205:
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Summary: Hive streaming ingest improvements (v2)
Key: HIVE-19205
URL: https://issues.apache.org/jira/browse/HIVE-19205
Project: Hive
Issue Type: Improvement
Components: Streaming
Affects Versions: 3.0.0, 3.1.0
Reporter: Prasanth Jayachandran
Assignee: Prasanth Jayachandran
This is umbrella jira to track hive streaming ingest improvements. At a high
level following are the improvements
- Support for dynamic partitioning
- API changes (simple streaming connection builder)
- Hide the transaction batches from clients (client can tune the transaction
batch but doesn't have to know about the transaction batch size)
- Support auto rollover to next transaction batch (clients don't have to worry
about closing a transaction batch and opening a new one)
- Record writers will all be strict meaning the schema of the record has to
match table schema. This is to avoid the multiple serialization/deserialization
for re-ordering columns if there is schema mismatch
- Automatic distribution for non-bucketed tables so that compactor can have
more parallelism
- Create delta files with all ORC overhead disabled (no compression, no
dictionary). Compactor will recreate the orc files with compression and
dictionary encoding.
- Automatic memory management via auto-flushing (will yield smaller stripes for
delta files but is more scalable and clients don't have to worry about
distributing the data across writers)
- Support for more writers (Avro specifically. ORC passthrough format?)
- Support to accept input stream instead of record byte[]
- Removing HCatalog dependency (old streaming API will be in the hcatalog
package for backward compatibility, new streaming API will be in its own hive
module)
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