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Posted to issues@hbase.apache.org by "Nihal Jain (JIRA)" <ji...@apache.org> on 2018/09/13 20:46:00 UTC
[jira] [Updated] (HBASE-21196) HTableMultiplexer clears the meta
cache after every put operation
[ https://issues.apache.org/jira/browse/HBASE-21196?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Nihal Jain updated HBASE-21196:
-------------------------------
Attachment: HTableMultiplexer1000Puts.UT.txt
> HTableMultiplexer clears the meta cache after every put operation
> -----------------------------------------------------------------
>
> Key: HBASE-21196
> URL: https://issues.apache.org/jira/browse/HBASE-21196
> Project: HBase
> Issue Type: Bug
> Components: Performance
> Affects Versions: 3.0.0, 1.3.3, 2.2.0
> Reporter: Nihal Jain
> Assignee: Nihal Jain
> Priority: Critical
> Attachments: HTableMultiplexer1000Puts.UT.txt
>
>
> Operations which use {{AsyncRequestFutureImpl.receiveMultiAction(MultiAction, ServerName, MultiResponse, int)}} API with tablename set to null reset the meta cache of the corresponding server after each call. One such operation is put operation of HTableMultiplexer (Might not be the only one). This may impact the performance of the system severely as all new ops directed to that server will have to go to zk first to get the meta table address and then get the location of the table region as it will become empty after every htablemultiplexer put.
> From the logs below, one can see after every other put the cached region locations are cleared. As a side effect of this, before every put the server needs to contact zk and get meta table location and read meta to get region locations of the table.
> {noformat}
> 2018-09-13 22:21:15,467 TRACE [htable-pool11-t1] client.MetaCache(283): Removed all cached region locations that map to root1-thinkpad-t440p,35811,1536857446588
> 2018-09-13 22:21:15,467 DEBUG [HTableFlushWorker-5] client.HTableMultiplexer$FlushWorker(632): Processed 1 put requests for root1-ThinkPad-T440p:35811 and 0 failed, latency for this send: 5
> 2018-09-13 22:21:15,515 TRACE [RpcServer.reader=1,bindAddress=root1-ThinkPad-T440p,port=35811] ipc.RpcServer$Connection(1954): RequestHeader call_id: 218 method_name: "Get" request_param: true priority: 0 timeout: 60000 totalRequestSize: 137 bytes
> 2018-09-13 22:21:15,515 TRACE [RpcServer.FifoWFPBQ.default.handler=3,queue=0,port=35811] ipc.CallRunner(105): callId: 218 service: ClientService methodName: Get size: 137 connection: 127.0.0.1:42338 executing as root1
> 2018-09-13 22:21:15,515 TRACE [RpcServer.FifoWFPBQ.default.handler=3,queue=0,port=35811] ipc.RpcServer(2356): callId: 218 service: ClientService methodName: Get size: 137 connection: 127.0.0.1:42338 param: region= testHTableMultiplexer_1,,1536857451720.304d914b641a738624937c7f9b4d684f., row=\x00\x00\x00\xC4 connection: 127.0.0.1:42338, response result { associated_cell_count: 1 stale: false } queueTime: 0 processingTime: 0 totalTime: 0
> 2018-09-13 22:21:15,516 TRACE [RpcServer.FifoWFPBQ.default.handler=3,queue=0,port=35811] io.BoundedByteBufferPool(106): runningAverage=16384, totalCapacity=0, count=0, allocations=1
> 2018-09-13 22:21:15,516 TRACE [main] ipc.AbstractRpcClient(236): Call: Get, callTime: 2ms
> 2018-09-13 22:21:15,516 TRACE [main] client.ClientScanner(122): Scan table=hbase:meta, startRow=testHTableMultiplexer_1,\x00\x00\x00\xC5,99999999999999
> 2018-09-13 22:21:15,516 TRACE [main] client.ClientSmallReversedScanner(179): Advancing internal small scanner to startKey at 'testHTableMultiplexer_1,\x00\x00\x00\xC5,99999999999999'
> 2018-09-13 22:21:15,517 TRACE [main] client.ZooKeeperRegistry(59): Looking up meta region location in ZK, connection=org.apache.hadoop.hbase.client.ZooKeeperRegistry@599f571f
> {noformat}
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