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From "Liu Shaohui (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-12270) A bug in the bucket cache, with cache blocks on write enabled
Date Fri, 09 Jan 2015 13:44:35 GMT

     [ https://issues.apache.org/jira/browse/HBASE-12270?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Liu Shaohui updated HBASE-12270:
--------------------------------
    Attachment: HBASE-12270-0.98-v1.diff

[~apurtell]

Update the patch for 0.98.

The cache data write in bucket cache is asynchronous and the bucket cache will abandon the
data to cache if the write queue is full. For we use the disk as bucket cache in the test,
the write of data will be slow, which may make the queue is full and data are not cached in
the bucket cache.

Changes: enlarge the write thread number and write queue size.

Please help to trigger the ci test for 0.98 and 0.98-on-Hadoop-1.1. Thanks~

PS: Using MockedBucketCache with wait_when_cache=true is another option, but the DEFAULT_CACHE_WAIT_TIME
(50ms) is too small.



> A bug in the bucket cache, with cache blocks on write enabled
> -------------------------------------------------------------
>
>                 Key: HBASE-12270
>                 URL: https://issues.apache.org/jira/browse/HBASE-12270
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.94.11, 0.98.6.1
>         Environment: I can reproduce it on a simple 2 node cluster, one running the master
and another running a RS. I was testing on ec2.
> I used the following configurations for the cluster. 
> hbase-env:HBASE_REGIONSERVER_OPTS=-Xmx2G -XX:MaxDirectMemorySize=5G -XX:CMSInitiatingOccupancyFraction=88
-XX:+AggressiveOpts -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -Xlog gc:/tmp/hbase-regionserver-gc.log
> hbase-site:
> hbase.bucketcache.ioengine=offheap
> hbase.bucketcache.size=4196
> hbase.rs.cacheblocksonwrite=true
> hfile.block.index.cacheonwrite=true
> hfile.block.bloom.cacheonwrite=true
>            Reporter: Khaled Elmeleegy
>            Assignee: Liu Shaohui
>            Priority: Critical
>             Fix For: 1.0.0, 2.0.0, 0.98.10, 1.1.0
>
>         Attachments: HBASE-12270-0.98-v1.diff, HBASE-12270-v1.diff, HBASE-12270-v2.diff,
HBASE-12270-v2.patch, TestHBase.java, TestKey.java
>
>
> In my experiments, I have writers streaming their output to HBase. The reader powers
a web page and does this scatter/gather, where it reads 1000 keys written last and passes
them the the front end. With this workload, I get the exception below at the region server.
Again, I am using HBAse (0.98.6.1). Any help is appreciated.
> 2014-10-10 15:06:44,173 ERROR [B.DefaultRpcServer.handler=62,queue=2,port=60020] ipc.RpcServer:
Unexpected throwable object 
> java.lang.IllegalArgumentException
>   at java.nio.Buffer.position(Buffer.java:236)
>  at org.apache.hadoop.hbase.util.ByteBufferUtils.skip(ByteBufferUtils.java:434)
>       at org.apache.hadoop.hbase.io.hfile.HFileReaderV2$ScannerV2.readKeyValueLen(HFileReaderV2.java:849)
>       at org.apache.hadoop.hbase.io.hfile.HFileReaderV2$ScannerV2.next(HFileReaderV2.java:760)
>  at org.apache.hadoop.hbase.regionserver.StoreFileScanner.seekAtOrAfter(StoreFileScanner.java:248)
>    at org.apache.hadoop.hbase.regionserver.StoreFileScanner.seek(StoreFileScanner.java:152)
>       at org.apache.hadoop.hbase.regionserver.StoreScanner.seekScanners(StoreScanner.java:317)
>  at org.apache.hadoop.hbase.regionserver.StoreScanner.<init>(StoreScanner.java:176)
>   at org.apache.hadoop.hbase.regionserver.HStore.getScanner(HStore.java:1780)
>   at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.<init>(HRegion.java:3758)
>   at org.apache.hadoop.hbase.regionserver.HRegion.instantiateRegionScanner(HRegion.java:1950)
>   at org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1936)
>         at org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1913)
>       at org.apache.hadoop.hbase.regionserver.HRegionServer.scan(HRegionServer.java:3157)
>       at org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:29587)
>    at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2027)
>     at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:108)
>      at org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:114)
>    at org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:94)
>  at java.lang.Thread.run(Thread.java:744)



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