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https://issues.apache.org/jira/browse/HBASE-6798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13457593#comment-13457593
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Anoop Sam John commented on HBASE-6798:
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bq.I did not realize hbase checksumming was a local-reads only facility.
Stack - In HBase handled checksum we write the checksum info also into the
HFile blocks and do comparison once block data is fetched into RS. Does it
related with only local reads? Pls correct me if my understanding is wrong..
Here when we fetch data from HDFS I guess we were using diff APIs or so to tell
HDFS not to do the checksum check
> HDFS always read checksum form meta file
> ----------------------------------------
>
> Key: HBASE-6798
> URL: https://issues.apache.org/jira/browse/HBASE-6798
> Project: HBase
> Issue Type: Bug
> Components: performance
> Affects Versions: 0.94.0, 0.94.1
> Reporter: LiuLei
> Priority: Blocker
>
> I use hbase0.941 and hadoop-0.20.2-cdh3u5 version.
> The HBase support checksums in HBase block cache in HBASE-5074 jira.
> The HBase support checksums for decrease the iops of HDFS, so that HDFS
> dont't need to read the checksum from meta file of block file.
> But in hadoop-0.20.2-cdh3u5 version, BlockSender still read the metadata file
> even if the
> hbase.regionserver.checksum.verify property is ture.
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