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Posted to dev@tephra.apache.org by "Poorna Chandra (JIRA)" <ji...@apache.org> on 2017/12/15 22:05:00 UTC

[jira] [Created] (TEPHRA-270) Avoid transaction state cache refresh on co-procesor startup

Poorna Chandra created TEPHRA-270:
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             Summary: Avoid transaction state cache refresh on co-procesor startup
                 Key: TEPHRA-270
                 URL: https://issues.apache.org/jira/browse/TEPHRA-270
             Project: Tephra
          Issue Type: Improvement
          Components: core
            Reporter: Poorna Chandra
            Assignee: Poorna Chandra
             Fix For: 0.14.0-incubating


Transaction state cache, on startup, refreshes the transaction snapshot from HDFS. The transaction state cache startup is called during HBase co-processor startup. The refresh of the transaction snapshot can block, thus blocking the co-processor startup. 

The subsequent transaction snapshot refreshes happen in the background Also - there is no guarantee that a snapshot will be present during the refresh on startup. Hence it is okay not to refresh the snapshot during snapshot, but do it in background.




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