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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14178) regionserver blocks because of waiting for offsetLock
Date Thu, 06 Aug 2015 05:02:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14659494#comment-14659494
] 

Anoop Sam John commented on HBASE-14178:
----------------------------------------

Why we need different condition for reading from the cache with and with out lock?  with out
lock we do at first , as an optimistic approach.  If block is not there by then, we are doing
one more round of check for a possible another concurrent thread doing the caching of this
block.  So we use lock then. So am not sure whether to read from cache why it has to have
different condition.   Looks like the patch tend to make an impression that we will read from
cache *with lock* in order to cache that block into the BC.  But it is not the case.   Sorry
if I missed some other discussion parts in above comments

> regionserver blocks because of waiting for offsetLock
> -----------------------------------------------------
>
>                 Key: HBASE-14178
>                 URL: https://issues.apache.org/jira/browse/HBASE-14178
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.98.6
>            Reporter: Heng Chen
>            Priority: Critical
>             Fix For: 0.98.6
>
>         Attachments: HBASE-14178-0.98.patch, HBASE-14178.patch, HBASE-14178_v1.patch,
HBASE-14178_v2.patch, HBASE-14178_v3.patch, HBASE-14178_v4.patch, HBASE-14178_v5.patch, HBASE-14178_v6.patch,
jstack
>
>
> My regionserver blocks, and all client rpc timeout. 
> I print the regionserver's jstack,  it seems a lot of threads were blocked for waiting
offsetLock, detail infomation belows:
> PS:  my table's block cache is off
> {code}
> "B.DefaultRpcServer.handler=2,queue=2,port=60020" #82 daemon prio=5 os_prio=0 tid=0x0000000001827000
nid=0x2cdc in Object.wait() [0x00007f3831b72000]
>    java.lang.Thread.State: WAITING (on object monitor)
>         at java.lang.Object.wait(Native Method)
>         at java.lang.Object.wait(Object.java:502)
>         at org.apache.hadoop.hbase.util.IdLock.getLockEntry(IdLock.java:79)
>         - locked <0x0000000773af7c18> (a org.apache.hadoop.hbase.util.IdLock$Entry)
>         at org.apache.hadoop.hbase.io.hfile.HFileReaderV2.readBlock(HFileReaderV2.java:352)
>         at org.apache.hadoop.hbase.io.hfile.HFileBlockIndex$BlockIndexReader.loadDataBlockWithScanInfo(HFileBlockIndex.java:253)
>         at org.apache.hadoop.hbase.io.hfile.HFileReaderV2$AbstractScannerV2.seekTo(HFileReaderV2.java:524)
>         at org.apache.hadoop.hbase.io.hfile.HFileReaderV2$AbstractScannerV2.reseekTo(HFileReaderV2.java:572)
>         at org.apache.hadoop.hbase.regionserver.StoreFileScanner.reseekAtOrAfter(StoreFileScanner.java:257)
>         at org.apache.hadoop.hbase.regionserver.StoreFileScanner.reseek(StoreFileScanner.java:173)
>         at org.apache.hadoop.hbase.regionserver.NonLazyKeyValueScanner.doRealSeek(NonLazyKeyValueScanner.java:55)
>         at org.apache.hadoop.hbase.regionserver.KeyValueHeap.generalizedSeek(KeyValueHeap.java:313)
>         at org.apache.hadoop.hbase.regionserver.KeyValueHeap.requestSeek(KeyValueHeap.java:269)
>         at org.apache.hadoop.hbase.regionserver.StoreScanner.reseek(StoreScanner.java:695)
>         at org.apache.hadoop.hbase.regionserver.StoreScanner.seekAsDirection(StoreScanner.java:683)
>         at org.apache.hadoop.hbase.regionserver.StoreScanner.next(StoreScanner.java:533)
>         at org.apache.hadoop.hbase.regionserver.KeyValueHeap.next(KeyValueHeap.java:140)
>         at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.populateResult(HRegion.java:3889)
>         at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextInternal(HRegion.java:3969)
>         at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextRaw(HRegion.java:3847)
>         at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.next(HRegion.java:3820)
>         - locked <0x00000005e5c55ad0> (a org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl)
>         at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.next(HRegion.java:3807)
>         at org.apache.hadoop.hbase.regionserver.HRegion.get(HRegion.java:4779)
>         at org.apache.hadoop.hbase.regionserver.HRegion.get(HRegion.java:4753)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.get(HRegionServer.java:2916)
>         at org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:29583)
>         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$1.run(RpcExecutor.java:94)
>         at java.lang.Thread.run(Thread.java:745)
>    Locked ownable synchronizers:
>         - <0x00000005e5c55c08> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
> {code}



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