Sijie Guo created DL-117:
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Summary: Stream metadata store
Key: DL-117
URL: https://issues.apache.org/jira/browse/DL-117
Project: DistributedLog
Issue Type: Improvement
Components: distributedlog-core
Affects Versions: 0.4.0
Reporter: Sijie Guo
Assignee: Sijie Guo
This change is to abstract the zookeeper operations into a stream metadata
store, so we can replace zookeeper with other me
tadata store easily.
So the metadata operations in distributedlog now are managed by 3 classes:
- LogMetadataStore : it is the namespace metadata store : it manages the
location (uri) mapping for streams and handle name
space operations.
- LogStreamMetadataStore: it is the stream metadata store : it manages the
metadata for a single stream, such as managing r
ead/write lock, retriving/creating stream metadata, deleting metadata and such.
- LogSegmentMetadataStore: it is the segment metadata store : it manages
the log segment metadata for individual log segmen
t.
LogMetadataStore and LogSegmentMetadataStore are already there. This change
focus on LogStreamMetadataStore
Changed:
* abstract all the zookeeper metadata operation in log handlers to
LogStreamMetadataStore
* remove disabling max tx id santify check, as maxTxId update is part of
the metadata update transaction
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