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Posted to issues@hbase.apache.org by "Lars Hofhansl (JIRA)" <ji...@apache.org> on 2012/12/12 06:51:21 UTC

[jira] [Created] (HBASE-7336) HFileBlock.readAtOffset does not work well with multiple threads

Lars Hofhansl created HBASE-7336:
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             Summary: HFileBlock.readAtOffset does not work well with multiple threads
                 Key: HBASE-7336
                 URL: https://issues.apache.org/jira/browse/HBASE-7336
             Project: HBase
          Issue Type: Bug
            Reporter: Lars Hofhansl
            Assignee: Lars Hofhansl
            Priority: Critical
             Fix For: 0.96.0, 0.94.4


HBase grinds to a halt when many threads scan along the same set of blocks and neither read short circuit is nor block caching is enabled for the dfs client ... disabling the block cache makes sense on very large scans.

It turns out that synchronizing in istream in HFileBlock.readAtOffset is the culprit.

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