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https://issues.apache.org/jira/browse/HDFS-13821?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17424499#comment-17424499
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Janus Chow commented on HDFS-13821:
-----------------------------------
The performance bottleneck should be related to the bug mentioned in
[https://github.com/google/guava/issues/1055.]
We can work around this issue by setting initialCapacity to maxCacheSize
(mentioned in [https://unportant.info/chasing-down-guava-cache-slowness.html).]
In branch 2.10, the guava version is 11.0.2, it's still affected.
> RBF: Add dfs.federation.router.mount-table.cache.enable so that users can
> disable cache
> ---------------------------------------------------------------------------------------
>
> Key: HDFS-13821
> URL: https://issues.apache.org/jira/browse/HDFS-13821
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Affects Versions: 3.1.0, 2.9.1, 3.0.3
> Reporter: Hui Fei
> Assignee: Hui Fei
> Priority: Major
> Fix For: 2.10.0, 3.2.0, 2.9.2, 3.0.4, 3.1.2
>
> Attachments: HDFS-13821.001.patch, HDFS-13821.002.patch,
> HDFS-13821.003.patch, HDFS-13821.004.patch, HDFS-13821.005.patch,
> HDFS-13821.006.patch, HDFS-13821.007.patch, HDFS-13821.008.patch,
> LocalCacheTest.java, image-2018-08-13-11-27-49-023.png
>
>
> When i test rbf, if found performance problem.
> I found that ProxyAvgTime From Ganglia is so high, i run jstack on Router and
> get the following stack frames
> {quote}
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000005c264acd8> (a
> java.util.concurrent.locks.ReentrantLock$NonfairSync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:870)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1199)
> at
> java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:209)
> at
> java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:285)
> at
> com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2249)
> at
> com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2228)
> at com.google.common.cache.LocalCache.get(LocalCache.java:3965)
> at
> com.google.common.cache.LocalCache$LocalManualCache.get(LocalCache.java:4764)
> at
> org.apache.hadoop.hdfs.server.federation.resolver.MountTableResolver.getDestinationForPath(MountTableResolver.java:380)
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcServer.getLocationsForPath(RouterRpcServer.java:2104)
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcServer.getLocationsForPath(RouterRpcServer.java:2087)
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcServer.getListing(RouterRpcServer.java:1050)
> at
> org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.getListing(ClientNamenodeProtocolServerSideTranslatorPB.java:640)
> at
> org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:616)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:982)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2115)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2111)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> {quote}
> Many threads blocked on *LocalCache*
> After disable the cache, ProxyAvgTime is down as follow showed
> !image-2018-08-13-11-27-49-023.png!
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