[jira] [Created] (DL-117) Stream metadata store

["Sijie Guo (JIRA)" <ji...@apache.org>]

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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