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https://issues.apache.org/jira/browse/HBASE-5607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13239784#comment-13239784
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Ferdy Galema commented on HBASE-5607:
-------------------------------------
I agree that HBASE-2214 makes this issue considerably less important, perhaps
even obsolete. It depends on how 2214 will be implemented: If it becomes a
default setting then this issue does not have to be fixed. A user disabling the
response cap obviously has good reasons to do so. However if a user has to
explicitly set it in order to be in effect, then they might not think about it
and simply set a caching based on the number of rows, therefore possibly
causing too big response. Throttling would help in this case. If you think the
latter is not a real problem, then this issue can be closed.
> Implement scanner caching throttling to prevent too big responses
> ------------------------------------------------------------------
>
> Key: HBASE-5607
> URL: https://issues.apache.org/jira/browse/HBASE-5607
> Project: HBase
> Issue Type: Improvement
> Reporter: Ferdy Galema
>
> When a misconfigured client retrieves fat rows with a scanner caching value
> set too high, there is a big chance the regionserver cannot handle the
> response buffers. (See log example below). Also see the mailing list thread:
> http://comments.gmane.org/gmane.comp.java.hadoop.hbase.user/24819
> This issue is for tracking a solution that throttles the scanner caching
> value in the case the response buffers are too big.
> A few possible solutions:
> a) Is a response (repeatedly) over 100MB (configurable), then reduce the
> scanner-caching by half its size. (In either server or client).
> b) Introduce a property that defines a fixed (target) response size, instead
> of defining the numbers of rows to cache.
> 2012-03-20 07:57:40,092 WARN org.apache.hadoop.ipc.HBaseServer: IPC Server
> handler 5 on 60020, responseTooLarge for: next(4438820558358059204, 1000)
> from 172.23.122.15:50218: Size: 105.0m
> 2012-03-20 07:57:53,226 WARN org.apache.hadoop.ipc.HBaseServer: IPC Server
> handler 3 on 60020, responseTooLarge for: next(-7429189123174849941, 1000)
> from 172.23.122.15:50218: Size: 214.4m
> 2012-03-20 07:57:57,839 WARN org.apache.hadoop.ipc.HBaseServer: IPC Server
> handler 5 on 60020, responseTooLarge for: next(-7429189123174849941, 1000)
> from 172.23.122.15:50218: Size: 103.2m
> 2012-03-20 07:57:59,442 WARN org.apache.hadoop.ipc.HBaseServer: IPC Server
> handler 2 on 60020, responseTooLarge for: next(-7429189123174849941, 1000)
> from 172.23.122.15:50218: Size: 101.8m
> 2012-03-20 07:58:20,025 WARN org.apache.hadoop.ipc.HBaseServer: IPC Server
> handler 6 on 60020, responseTooLarge for: next(9033159548564260857, 1000)
> from 172.23.122.15:50218: Size: 107.2m
> 2012-03-20 07:58:27,273 WARN org.apache.hadoop.ipc.HBaseServer: IPC Server
> handler 3 on 60020, responseTooLarge for: next(9033159548564260857, 1000)
> from 172.23.122.15:50218: Size: 100.1m
> 2012-03-20 07:58:52,783 WARN org.apache.hadoop.ipc.HBaseServer: IPC Server
> handler 1 on 60020, responseTooLarge for: next(-8611621895979000997, 1000)
> from 172.23.122.15:50218: Size: 101.7m
> 2012-03-20 07:59:02,541 WARN org.apache.hadoop.ipc.HBaseServer: IPC Server
> handler 0 on 60020, responseTooLarge for: next(-511305750191148153, 1000)
> from 172.23.122.15:50218: Size: 120.9m
> 2012-03-20 07:59:25,346 WARN org.apache.hadoop.ipc.HBaseServer: IPC Server
> handler 6 on 60020, responseTooLarge for: next(1570572538285935733, 1000)
> from 172.23.122.15:50218: Size: 107.8m
> 2012-03-20 07:59:46,805 WARN org.apache.hadoop.ipc.HBaseServer: IPC Server
> handler 3 on 60020, responseTooLarge for: next(-727080724379055435, 1000)
> from 172.23.122.15:50218: Size: 102.7m
> 2012-03-20 08:00:00,138 WARN org.apache.hadoop.ipc.HBaseServer: IPC Server
> handler 3 on 60020, responseTooLarge for: next(-3701270248575643714, 1000)
> from 172.23.122.15:50218: Size: 122.1m
> 2012-03-20 08:00:21,232 WARN org.apache.hadoop.ipc.HBaseServer: IPC Server
> handler 6 on 60020, responseTooLarge for: next(5831907615409186602, 1000)
> from 172.23.122.15:50218: Size: 157.5m
> 2012-03-20 08:00:23,199 WARN org.apache.hadoop.ipc.HBaseServer: IPC Server
> handler 9 on 60020, responseTooLarge for: next(5831907615409186602, 1000)
> from 172.23.122.15:50218: Size: 160.7m
> 2012-03-20 08:00:28,174 WARN org.apache.hadoop.ipc.HBaseServer: IPC Server
> handler 2 on 60020, responseTooLarge for: next(5831907615409186602, 1000)
> from 172.23.122.15:50218: Size: 160.8m
> 2012-03-20 08:00:32,643 WARN org.apache.hadoop.ipc.HBaseServer: IPC Server
> handler 7 on 60020, responseTooLarge for: next(5831907615409186602, 1000)
> from 172.23.122.15:50218: Size: 182.4m
> 2012-03-20 08:00:36,826 WARN org.apache.hadoop.ipc.HBaseServer: IPC Server
> handler 9 on 60020, responseTooLarge for: next(5831907615409186602, 1000)
> from 172.23.122.15:50218: Size: 237.2m
> 2012-03-20 08:00:40,850 WARN org.apache.hadoop.ipc.HBaseServer: IPC Server
> handler 3 on 60020, responseTooLarge for: next(5831907615409186602, 1000)
> from 172.23.122.15:50218: Size: 212.7m
> 2012-03-20 08:00:44,736 WARN org.apache.hadoop.ipc.HBaseServer: IPC Server
> handler 1 on 60020, responseTooLarge for: next(5831907615409186602, 1000)
> from 172.23.122.15:50218: Size: 232.9m
> 2012-03-20 08:00:49,471 WARN org.apache.hadoop.ipc.HBaseServer: IPC Server
> handler 7 on 60020, responseTooLarge for: next(5831907615409186602, 1000)
> from 172.23.122.15:50218: Size: 227.2m
> 2012-03-20 08:00:57,566 FATAL
> org.apache.hadoop.hbase.regionserver.HRegionServer: ABORTING region server
> serverName=c15.kalooga.nl,60020,1331900161295, load=(requests=706,
> regions=166, usedHeap=1505, maxHeap=1995): OutOfMemoryError, aborting
> java.lang.OutOfMemoryError: Java heap space
> at java.nio.HeapByteBuffer.<init>(HeapByteBuffer.java:39)
> at java.nio.ByteBuffer.allocate(ByteBuffer.java:312)
> at
> org.apache.hadoop.hbase.ipc.ByteBufferOutputStream.<init>(ByteBufferOutputStream.java:44)
> at
> org.apache.hadoop.hbase.ipc.ByteBufferOutputStream.<init>(ByteBufferOutputStream.java:37)
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1064)
> 2012-03-20 08:00:57,567 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer: Dump of metrics:
> requests=189, regions=166, stores=987, storefiles=1401,
> storefileIndexSize=222, memstoreSize=693, compactionQueueSize=0,
> flushQueueSize=0, usedHeap=1635, maxHeap=1995, blockCacheSize=315474864,
> blockCacheFree=103051152, blockCacheCount=4422, blockCacheHitCount=1152306,
> blockCacheMissCount=12464451, blockCacheEvictedCount=5585715,
> blockCacheHitRatio=8, blockCacheHitCachingRatio=16
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