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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