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https://issues.apache.org/jira/browse/HADOOP-19966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18142874#comment-18142874
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ASF GitHub Bot commented on HADOOP-19966:
-----------------------------------------
pan3793 commented on code in PR #8688:
URL: https://github.com/apache/hadoop/pull/8688#discussion_r4535453202
##########
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/ZKDelegationTokenSecretManager.java:
##########
@@ -290,8 +318,13 @@ public void startThreads() throws IOException {
try {
keyCache = CuratorCache.bridgeBuilder(zkClient, ZK_DTSM_MASTER_KEY_ROOT)
.build();
+ CountDownLatch keyCacheInitialized = new CountDownLatch(1);
CuratorCacheListener keyCacheListener = CuratorCacheListener.builder()
.forCreatesAndChanges((oldNode, node) -> {
+ if (ZK_DTSM_MASTER_KEY_ROOT.equals(node.getPath())) {
Review Comment:
Added `testRootPayloadNotParsed` in 1288c98, based on your snippet.
##########
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/ZKDelegationTokenSecretManager.java:
##########
@@ -96,6 +98,10 @@ public abstract class
ZKDelegationTokenSecretManager<TokenIdent extends Abstract
public static final String ZK_DTSM_TOKEN_WATCHER_ENABLED = ZK_CONF_PREFIX
+ "token.watcher.enabled";
public static final boolean ZK_DTSM_TOKEN_WATCHER_ENABLED_DEFAULT = true;
+ /** Bound on the wait for the initial cache load; 0 waits indefinitely. */
Review Comment:
Done in 1288c98: the Javadoc says per cache, and the constructor rejects
negative values (`testNegativeCacheInitTimeoutRejected`).
##########
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/ZKDelegationTokenSecretManager.java:
##########
@@ -290,8 +318,13 @@ public void startThreads() throws IOException {
try {
keyCache = CuratorCache.bridgeBuilder(zkClient, ZK_DTSM_MASTER_KEY_ROOT)
.build();
+ CountDownLatch keyCacheInitialized = new CountDownLatch(1);
CuratorCacheListener keyCacheListener = CuratorCacheListener.builder()
.forCreatesAndChanges((oldNode, node) -> {
+ if (ZK_DTSM_MASTER_KEY_ROOT.equals(node.getPath())) {
+ // The root node itself is a container, not a key.
+ return;
+ }
try {
processKeyAddOrUpdate(node.getData());
Review Comment:
Done in 1288c98: the three listener error logs include the znode path.
> ZKDelegationTokenSecretManager startup cache load races with CuratorCache
> initialization
> ----------------------------------------------------------------------------------------
>
> Key: HADOOP-19966
> URL: https://issues.apache.org/jira/browse/HADOOP-19966
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Cheng Pan
> Priority: Major
> Labels: pull-request-available
>
> Since HADOOP-17835 (3.4.0), ZKDelegationTokenSecretManager starts its
> CuratorCache asynchronously and reads it immediately, so loadFromZKCache runs
> against an empty or partial cache. Token verify/renew/cancel are unaffected
> because they fall back to ZooKeeper, and the cache listener fills the
> in-memory map a few seconds later. The lasting effects are:
> * token owner stats (Router getTopTokenRealOwners) are computed from a
> partial map and never corrected for pre-restart tokens;
> * the root container znode, which carries Curator's default data (the local
> address), is parsed as a key/token on every startup and logs an ERROR;
> * testNodesLoadedAfterRestart is flaky in CI.
> Fix: wait for CuratorCache initialization (forInitialized) before loading
> each cache, skip the root container znodes when processing cache events and
> when streaming the cache, create the root znodes with explicit empty data,
> and release the caches, counters and Curator client when startThreads() fails.
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