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https://issues.apache.org/jira/browse/HBASE-21196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16615517#comment-16615517
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Hadoop QA commented on HBASE-21196:
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m
19s{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {color} ||
| {color:green}+1{color} | {color:green} hbaseanti {color} | {color:green} 0m
0s{color} | {color:green} Patch does not have any anti-patterns. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green} 0m
0s{color} | {color:green} The patch does not contain any @author tags. {color} |
| {color:green}+1{color} | {color:green} test4tests {color} | {color:green} 0m
0s{color} | {color:green} The patch appears to include 1 new or modified test
files. {color} |
|| || || || {color:brown} master Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m
31s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 5m
31s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 2m
30s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 1m
45s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} shadedjars {color} | {color:green} 4m
20s{color} | {color:green} branch has no errors when building our shaded
downstream artifacts. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 3m
15s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m
8s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m
16s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 6m
31s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 3m
0s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 3m
0s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 1m
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| {color:green}+1{color} | {color:green} whitespace {color} | {color:green} 0m
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downstream artifacts. {color} |
| {color:green}+1{color} | {color:green} hadoopcheck {color} | {color:green}
14m 24s{color} | {color:green} Patch does not cause any errors with Hadoop
2.7.4 or 3.0.0. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 3m
47s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m
1s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 3m
16s{color} | {color:green} hbase-client in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}218m
7s{color} | {color:green} hbase-server in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m
41s{color} | {color:green} The patch does not generate ASF License warnings.
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| {color:black}{color} | {color:black} {color} | {color:black}278m 28s{color} |
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|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/hbase:b002b0b |
| JIRA Issue | HBASE-21196 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12939771/HBASE-21196.master.002.patch
|
| Optional Tests | asflicense javac javadoc unit findbugs shadedjars
hadoopcheck hbaseanti checkstyle compile |
| uname | Linux a0cea86c32d4 3.13.0-153-generic #203-Ubuntu SMP Thu Jun 14
08:52:28 UTC 2018 x86_64 GNU/Linux |
| Build tool | maven |
| Personality |
/home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build/component/dev-support/hbase-personality.sh
|
| git revision | master / 38a697ad1e |
| maven | version: Apache Maven 3.5.4
(1edded0938998edf8bf061f1ceb3cfdeccf443fe; 2018-06-17T18:33:14Z) |
| Default Java | 1.8.0_181 |
| findbugs | v3.1.0-RC3 |
| Test Results |
https://builds.apache.org/job/PreCommit-HBASE-Build/14421/testReport/ |
| Max. process+thread count | 4508 (vs. ulimit of 10000) |
| modules | C: hbase-client hbase-server U: . |
| Console output |
https://builds.apache.org/job/PreCommit-HBASE-Build/14421/console |
| Powered by | Apache Yetus 0.7.0 http://yetus.apache.org |
This message was automatically generated.
> 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
> Fix For: 3.0.0
>
> Attachments: HBASE-21196.master.001.patch,
> HBASE-21196.master.001.patch, HBASE-21196.master.002.patch,
> HTableMultiplexer1000Puts.UT.txt
>
>
> *Problem:* 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}
> From the minicluster logs [^HTableMultiplexer1000Puts.UT.txt] one can see
> that the string "Removed all cached region locations that map" and "Looking
> up meta region location in ZK" are present for every put.
> *Analysis:*
> The problem occurs as we call the {{cleanServerCache}} method always clears
> the server cache in case tablename is null and exception is null. See
> [AsyncRequestFutureImpl.java#L918|https://github.com/apache/hbase/blob/5d14c1af65c02f4e87059337c35e4431505de91c/hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncRequestFutureImpl.java#L918]
> {code:java}
> private void cleanServerCache(ServerName server, Throwable regionException) {
> if (tableName == null &&
> ClientExceptionsUtil.isMetaClearingException(regionException)) {
> // For multi-actions, we don't have a table name, but we want to make
> sure to clear the
> // cache in case there were location-related exceptions. We don't to
> clear the cache
> // for every possible exception that comes through, however.
> asyncProcess.connection.clearCaches(server);
> }
> }
> {code}
> The problem is
> [ClientExceptionsUtil.isMetaClearingException(regionException))|https://github.com/apache/hbase/blob/5d14c1af65c02f4e87059337c35e4431505de91c/hbase-client/src/main/java/org/apache/hadoop/hbase/exceptions/ClientExceptionsUtil.java#L51]
> assumes that the caller should take care of null exception check before
> calling the method i.e. it will return true if the passed exception is null,
> which may not be a correct assumption.
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