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https://issues.apache.org/jira/browse/HBASE-4111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13068705#comment-13068705
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Li Pi commented on HBASE-4111:
------------------------------
Can't seem to reproduce this bug using YCSB. I'm running HBase in Standalone
mode, dumping in a bunch of records with.
java -cp build/ycsb.jar:db/hbase/lib/* com.yahoo.ycsb.Client -load -db
com.yahoo.ycsb.db.HBaseClient -P workloads/workloadc -p columnfamily=family -p
recordcount=1000000 -s > load.dat.
No matter how low I turn the cache, or turn it off, my log looks like:
2011-07-20 16:14:28,879 DEBUG org.apache.hadoop.hbase.io.hfile.HFile:
decompressedSize = 65678
2011-07-20 16:14:28,880 DEBUG org.apache.hadoop.hbase.io.hfile.HFile:
decompressedSize = 65678
2011-07-20 16:14:28,881 DEBUG org.apache.hadoop.hbase.io.hfile.HFile:
decompressedSize = 65678
2011-07-20 16:14:28,882 DEBUG org.apache.hadoop.hbase.io.hfile.HFile:
decompressedSize = 65608
2011-07-20 16:14:28,883 DEBUG org.apache.hadoop.hbase.io.hfile.HFile:
decompressedSize = 65678
2011-07-20 16:14:28,884 DEBUG org.apache.hadoop.hbase.io.hfile.HFile:
decompressedSize = 65552
2011-07-20 16:14:28,884 DEBUG org.apache.hadoop.hbase.io.hfile.HFile:
decompressedSize = 65578
2011-07-20 16:14:28,887 DEBUG org.apache.hadoop.hbase.io.hfile.HFile:
decompressedSize = 65678
2011-07-20 16:14:28,887 DEBUG org.apache.hadoop.hbase.io.hfile.HFile:
decompressedSize = 65653
2011-07-20 16:14:28,888 DEBUG org.apache.hadoop.hbase.io.hfile.HFile:
decompressedSize = 65658
2011-07-20 16:14:28,889 DEBUG org.apache.hadoop.hbase.io.hfile.HFile:
decompressedSize = 65542
....
YCSB records are generally around the same size though - do you have any large
entries?
> readBlock in HFile.Reader not 64 KB, but 5~6MB
> ----------------------------------------------
>
> Key: HBASE-4111
> URL: https://issues.apache.org/jira/browse/HBASE-4111
> Project: HBase
> Issue Type: Bug
> Components: io, regionserver
> Reporter: mingjian
> Assignee: Li Pi
> Attachments: code and result.txt
>
>
> We found a strange problem in our read test.
> It is a 5 nodes cluster.Four of our 5 regionservers set
> "hfile.block.cache.size"=0.4, one of them is 0.1(we call it node A). When we
> random read from a 2TB data table we found node A's network reached 100MB,
> and others are less than 10MB. So the read speed is low.
> We set node A's "hfile.block.cache.size"=0.2, then all the nodes's
> network are 10MB, that's right. To find why is this we debug with btrace and
> find "readBlock" in HFile.Reader become abnormal.We know hbase read a block
> which is 64 KB from disks and put it into blockcache. But when we set
> "hfile.block.cache.size"=0.1, it is not 64KB, it is 5~6MB one time after
> about 1 minute we restart hbase.
> Why not 64 KB? The btrace code and results are in the attachments.
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