[pulsar-broker] Refresh ZooKeeper-data cache in background to avoid d… #8304
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rdhabalia
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codelipenghui and
massakam
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jiazhai
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FYI, there's another related fix #8406 that was already merged. |
This was referenced Oct 30, 2020
…eadlock and blocking IO on ZK thread fix test
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codelipenghui
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@wolfstudy After the CI passed, please help cherry-pick to 2.6.2, thanks. |
Sure, will process it. |
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…eadlock and blocking IO on ZK thread (apache#8304) ### Motivation We have been seeing broker restarts due to zk-session timeout and that's because of apache#4635 and ``` "pulsar-ordered-OrderedExecutor-4-0-EventThread" apache#33 daemon prio=5 os_prio=0 cpu=36314.97ms elapsed=698.44s tid=0x00007f8114029790 nid=0x2a31 waiting on condition [0x00007f8170575000] java.lang.Thread.State: TIMED_WAITING (parking) at jdk.internal.misc.Unsafe.park(java.base@11.0.6/Native Method) - parking to wait for <0x00001001a1c1aa50> (a java.util.concurrent.CompletableFuture$Signaller) at java.util.concurrent.locks.LockSupport.parkNanos(java.base@11.0.6/LockSupport.java:234) at java.util.concurrent.CompletableFuture$Signaller.block(java.base@11.0.6/CompletableFuture.java:1798) at java.util.concurrent.ForkJoinPool.managedBlock(java.base@11.0.6/ForkJoinPool.java:3128) at java.util.concurrent.CompletableFuture.timedGet(java.base@11.0.6/CompletableFuture.java:1868) at java.util.concurrent.CompletableFuture.get(java.base@11.0.6/CompletableFuture.java:2021) at org.apache.pulsar.zookeeper.ZooKeeperCache.getData(ZooKeeperCache.java:293) at org.apache.pulsar.zookeeper.ZooKeeperCache.getData(ZooKeeperCache.java:238) at org.apache.pulsar.zookeeper.ZkIsolatedBookieEnsemblePlacementPolicy.getBlacklistedBookies(ZkIsolatedBookieEnsemblePlacementPolicy.java:150) at org.apache.pulsar.zookeeper.ZkIsolatedBookieEnsemblePlacementPolicy.newEnsemble(ZkIsolatedBookieEnsemblePlacementPolicy.java:123) at org.apache.bookkeeper.client.BookieWatcherImpl.newEnsemble(BookieWatcherImpl.java:233) at org.apache.bookkeeper.client.LedgerCreateOp.initiate(LedgerCreateOp.java:141) at org.apache.bookkeeper.client.BookKeeper.asyncCreateLedger(BookKeeper.java:831) at org.apache.bookkeeper.mledger.impl.ManagedLedgerImpl.asyncCreateLedger(ManagedLedgerImpl.java:3063) at org.apache.bookkeeper.mledger.impl.ManagedLedgerImpl.ledgerClosed(ManagedLedgerImpl.java:1378) - locked <0x0000100035d21d60> (a org.apache.bookkeeper.mledger.impl.ManagedLedgerImpl) at org.apache.bookkeeper.mledger.impl.OpAddEntry.closeComplete(OpAddEntry.java:188) at org.apache.bookkeeper.client.LedgerHandle$5.lambda$safeRun$0(LedgerHandle.java:556) at org.apache.bookkeeper.client.LedgerHandle$5$$Lambda$935/0x00007f7f30252908.accept(Unknown Source) ``` The main reason of such zk-session timeout and broker-restart is all zk-event threads get blocked on ZK-Cache, [zk-session-wather](https://github.com/apache/pulsar/blob/master/pulsar-zookeeper-utils/src/main/java/org/apache/pulsar/zookeeper/ZooKeeperSessionWatcher.java) can't complete keep-alive and eventually zk-session timeout. Zk-thread gets blocked on `ZooKeeperCache` because [zk-cache](https://github.com/apache/pulsar/blob/master/pulsar-zookeeper-utils/src/main/java/org/apache/pulsar/zookeeper/ZooKeeperCache.java#L111) expires cache-entry at every 5 mins and Zk-thread misses the cache and tries to retrieve from zk. once, all zk-thread are blocked on Zk-Cache to get data from zk, it creates a deadlock and broker sees zk-session timeout. One of the solutions is to keep entries always available in cache, avoid cache miss and refresh zk-cache in background. this solution will make sure that zk-thread will not see cache-miss and will not be blocked. ### Modification - Refresh Zk-Cache in background without invalidating cache data so, it avoids zk-cache once entry is loaded at first time. ### Result It wil fix apache#4635
flowchartsman
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Nov 17, 2020
…eadlock and blocking IO on ZK thread (apache#8304) ### Motivation We have been seeing broker restarts due to zk-session timeout and that's because of apache#4635 and ``` "pulsar-ordered-OrderedExecutor-4-0-EventThread" apache#33 daemon prio=5 os_prio=0 cpu=36314.97ms elapsed=698.44s tid=0x00007f8114029790 nid=0x2a31 waiting on condition [0x00007f8170575000] java.lang.Thread.State: TIMED_WAITING (parking) at jdk.internal.misc.Unsafe.park(java.base@11.0.6/Native Method) - parking to wait for <0x00001001a1c1aa50> (a java.util.concurrent.CompletableFuture$Signaller) at java.util.concurrent.locks.LockSupport.parkNanos(java.base@11.0.6/LockSupport.java:234) at java.util.concurrent.CompletableFuture$Signaller.block(java.base@11.0.6/CompletableFuture.java:1798) at java.util.concurrent.ForkJoinPool.managedBlock(java.base@11.0.6/ForkJoinPool.java:3128) at java.util.concurrent.CompletableFuture.timedGet(java.base@11.0.6/CompletableFuture.java:1868) at java.util.concurrent.CompletableFuture.get(java.base@11.0.6/CompletableFuture.java:2021) at org.apache.pulsar.zookeeper.ZooKeeperCache.getData(ZooKeeperCache.java:293) at org.apache.pulsar.zookeeper.ZooKeeperCache.getData(ZooKeeperCache.java:238) at org.apache.pulsar.zookeeper.ZkIsolatedBookieEnsemblePlacementPolicy.getBlacklistedBookies(ZkIsolatedBookieEnsemblePlacementPolicy.java:150) at org.apache.pulsar.zookeeper.ZkIsolatedBookieEnsemblePlacementPolicy.newEnsemble(ZkIsolatedBookieEnsemblePlacementPolicy.java:123) at org.apache.bookkeeper.client.BookieWatcherImpl.newEnsemble(BookieWatcherImpl.java:233) at org.apache.bookkeeper.client.LedgerCreateOp.initiate(LedgerCreateOp.java:141) at org.apache.bookkeeper.client.BookKeeper.asyncCreateLedger(BookKeeper.java:831) at org.apache.bookkeeper.mledger.impl.ManagedLedgerImpl.asyncCreateLedger(ManagedLedgerImpl.java:3063) at org.apache.bookkeeper.mledger.impl.ManagedLedgerImpl.ledgerClosed(ManagedLedgerImpl.java:1378) - locked <0x0000100035d21d60> (a org.apache.bookkeeper.mledger.impl.ManagedLedgerImpl) at org.apache.bookkeeper.mledger.impl.OpAddEntry.closeComplete(OpAddEntry.java:188) at org.apache.bookkeeper.client.LedgerHandle$5.lambda$safeRun$0(LedgerHandle.java:556) at org.apache.bookkeeper.client.LedgerHandle$5$$Lambda$935/0x00007f7f30252908.accept(Unknown Source) ``` The main reason of such zk-session timeout and broker-restart is all zk-event threads get blocked on ZK-Cache, [zk-session-wather](https://github.com/apache/pulsar/blob/master/pulsar-zookeeper-utils/src/main/java/org/apache/pulsar/zookeeper/ZooKeeperSessionWatcher.java) can't complete keep-alive and eventually zk-session timeout. Zk-thread gets blocked on `ZooKeeperCache` because [zk-cache](https://github.com/apache/pulsar/blob/master/pulsar-zookeeper-utils/src/main/java/org/apache/pulsar/zookeeper/ZooKeeperCache.java#L111) expires cache-entry at every 5 mins and Zk-thread misses the cache and tries to retrieve from zk. once, all zk-thread are blocked on Zk-Cache to get data from zk, it creates a deadlock and broker sees zk-session timeout. One of the solutions is to keep entries always available in cache, avoid cache miss and refresh zk-cache in background. this solution will make sure that zk-thread will not see cache-miss and will not be blocked. ### Modification - Refresh Zk-Cache in background without invalidating cache data so, it avoids zk-cache once entry is loaded at first time. ### Result It wil fix apache#4635
codelipenghui
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Nov 20, 2020
jiazhai
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codelipenghui
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Nov 20, 2020
Fix cherry-pick issue of the apache#8304 (cherry picked from commit 3795d1f)
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codelipenghui
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apache#8652) (cherry picked from commit 45125a1)
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apache#8652) (cherry picked from commit 45125a1) (cherry picked from commit 6cab86a)
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Fix cherry-pick issue of the apache#8304 (cherry picked from commit 3795d1f)
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…eadlock and blocking IO on ZK thread
Motivation
We have been seeing broker restarts due to zk-session timeout and that's because of #4635 and
The main reason of such zk-session timeout and broker-restart is all zk-event threads get blocked on ZK-Cache, zk-session-wather can't complete keep-alive and eventually zk-session timeout. Zk-thread gets blocked on
ZooKeeperCachebecause zk-cache expires cache-entry at every 5 mins and Zk-thread misses the cache and tries to retrieve from zk. once, all zk-thread are blocked on Zk-Cache to get data from zk, it creates a deadlock and broker sees zk-session timeout.One of the solutions is to keep entries always available in cache, avoid cache miss and refresh zk-cache in background. this solution will make sure that zk-thread will not see cache-miss and will not be blocked.
Modification
Result
It wil fix #4635