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https://issues.apache.org/jira/browse/HBASE-6577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13440843#comment-13440843
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Lars Hofhansl commented on HBASE-6577:
--------------------------------------
>From Elliot:
"IPC Server handler 43 on 10304" daemon prio=10 tid=0x00007f16b8b1f000
nid=0x6414 runnable [0x00007f16b47c6000]
java.lang.Thread.State: RUNNABLE
at
org.apache.hadoop.hbase.KeyValue.createFirstOnRowColTS(KeyValue.java:1893)
at
org.apache.hadoop.hbase.regionserver.StoreFileScanner.requestSeek(StoreFileScanner.java:310)
at
org.apache.hadoop.hbase.regionserver.KeyValueHeap.generalizedSeek(KeyValueHeap.java:297)
at
org.apache.hadoop.hbase.regionserver.KeyValueHeap.requestSeek(KeyValueHeap.java:256)
at
org.apache.hadoop.hbase.regionserver.StoreScanner.reseek(StoreScanner.java:522)
- locked <0x00000006cec5bd88> (a
org.apache.hadoop.hbase.regionserver.StoreScanner)
at
org.apache.hadoop.hbase.regionserver.NonLazyKeyValueScanner.doRealSeek(NonLazyKeyValueScanner.java:54)
at
org.apache.hadoop.hbase.regionserver.NonLazyKeyValueScanner.requestSeek(NonLazyKeyValueScanner.java:38)
at
org.apache.hadoop.hbase.regionserver.KeyValueHeap.generalizedSeek(KeyValueHeap.java:297)
at
org.apache.hadoop.hbase.regionserver.KeyValueHeap.requestSeek(KeyValueHeap.java:256)
at
org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextRow(HRegion.java:3508)
at
org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextInternal(HRegion.java:3456)
at
org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.next(HRegion.java:3406)
- locked <0x00000006cb842910> (a
org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl)
at
org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.next(HRegion.java:3423)
- locked <0x00000006cb842910> (a
org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.next(HRegionServer.java:2393)
at sun.reflect.GeneratedMethodAccessor34.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.apache.hadoop.hbase.ipc.WritableRpcEngine$Server.call(WritableRpcEngine.java:364)
at
org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1389)
Looks like this can cause busy waiting somehow. Until this interaction is
understood, I should revert the patch.
> RegionScannerImpl.nextRow() should seek to next row
> ---------------------------------------------------
>
> Key: HBASE-6577
> URL: https://issues.apache.org/jira/browse/HBASE-6577
> Project: HBase
> Issue Type: Bug
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Fix For: 0.96.0, 0.94.2
>
> Attachments: 6577-0.94.txt, 6577.txt, 6577-v2.txt
>
>
> RegionScannerImpl.nextRow() is called when a filter filters the entire row.
> In that case we should seek to the next row rather then iterating over all
> versions of all columns to get there.
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