Details
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Improvement
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Status: Closed
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Major
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Resolution: Fixed
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None
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None
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Reviewed
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0.96notable
Description
The current implementation of HDFS stores the data in one block file and the metadata(checksum) in another block file. This means that every read into the HBase block cache actually consumes two disk iops, one to the datafile and one to the checksum file. This is a major problem for scaling HBase, because HBase is usually bottlenecked on the number of random disk iops that the storage-hardware offers.
Attachments
Attachments
Issue Links
- is related to
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HDFS-2699 Store data and checksums together in block file
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- Open
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- relates to
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HBASE-5720 HFileDataBlockEncoderImpl uses wrong header size when reading HFiles with no checksums
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- Closed
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HBASE-5864 Error while reading from hfile in 0.94
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- Closed
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HBASE-6868 Skip checksum is broke; are we double-checksumming by default?
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- Closed
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