[jira] [Updated] (KAFKA-1387) Kafka getting stuck creating ephemeral node it has already created when two zookeeper sessions are established in a very short period of time
[ https://issues.apache.org/jira/browse/KAFKA-1387?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Jun Rao updated KAFKA-1387: --- Resolution: Fixed Status: Resolved (was: Patch Available) > Kafka getting stuck creating ephemeral node it has already created when two > zookeeper sessions are established in a very short period of time > - > > Key: KAFKA-1387 > URL: https://issues.apache.org/jira/browse/KAFKA-1387 > Project: Kafka > Issue Type: Bug >Affects Versions: 0.8.1.1 >Reporter: Fedor Korotkiy >Assignee: Flavio Junqueira >Priority: Critical > Labels: newbie, patch, zkclient-problems > Fix For: 0.9.0.0 > > Attachments: KAFKA-1387.patch, kafka-1387.patch > > > Kafka broker re-registers itself in zookeeper every time handleNewSession() > callback is invoked. > https://github.com/apache/kafka/blob/0.8.1/core/src/main/scala/kafka/server/KafkaHealthcheck.scala > > Now imagine the following sequence of events. > 1) Zookeeper session reestablishes. handleNewSession() callback is queued by > the zkClient, but not invoked yet. > 2) Zookeeper session reestablishes again, queueing callback second time. > 3) First callback is invoked, creating /broker/[id] ephemeral path. > 4) Second callback is invoked and it tries to create /broker/[id] path using > createEphemeralPathExpectConflictHandleZKBug() function. But the path is > already exists, so createEphemeralPathExpectConflictHandleZKBug() is getting > stuck in the infinite loop. > Seems like controller election code have the same issue. > I'am able to reproduce this issue on the 0.8.1 branch from github using the > following configs. > # zookeeper > tickTime=10 > dataDir=/tmp/zk/ > clientPort=2101 > maxClientCnxns=0 > # kafka > broker.id=1 > log.dir=/tmp/kafka > zookeeper.connect=localhost:2101 > zookeeper.connection.timeout.ms=100 > zookeeper.sessiontimeout.ms=100 > Just start kafka and zookeeper and then pause zookeeper several times using > Ctrl-Z. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Updated] (KAFKA-1387) Kafka getting stuck creating ephemeral node it has already created when two zookeeper sessions are established in a very short period of time
[ https://issues.apache.org/jira/browse/KAFKA-1387?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Flavio Junqueira updated KAFKA-1387: Fix Version/s: 0.8.3 > Kafka getting stuck creating ephemeral node it has already created when two > zookeeper sessions are established in a very short period of time > - > > Key: KAFKA-1387 > URL: https://issues.apache.org/jira/browse/KAFKA-1387 > Project: Kafka > Issue Type: Bug >Affects Versions: 0.8.1.1 >Reporter: Fedor Korotkiy >Assignee: Flavio Junqueira >Priority: Blocker > Labels: newbie, patch, zkclient-problems > Fix For: 0.8.3 > > Attachments: KAFKA-1387.patch, kafka-1387.patch > > > Kafka broker re-registers itself in zookeeper every time handleNewSession() > callback is invoked. > https://github.com/apache/kafka/blob/0.8.1/core/src/main/scala/kafka/server/KafkaHealthcheck.scala > > Now imagine the following sequence of events. > 1) Zookeeper session reestablishes. handleNewSession() callback is queued by > the zkClient, but not invoked yet. > 2) Zookeeper session reestablishes again, queueing callback second time. > 3) First callback is invoked, creating /broker/[id] ephemeral path. > 4) Second callback is invoked and it tries to create /broker/[id] path using > createEphemeralPathExpectConflictHandleZKBug() function. But the path is > already exists, so createEphemeralPathExpectConflictHandleZKBug() is getting > stuck in the infinite loop. > Seems like controller election code have the same issue. > I'am able to reproduce this issue on the 0.8.1 branch from github using the > following configs. > # zookeeper > tickTime=10 > dataDir=/tmp/zk/ > clientPort=2101 > maxClientCnxns=0 > # kafka > broker.id=1 > log.dir=/tmp/kafka > zookeeper.connect=localhost:2101 > zookeeper.connection.timeout.ms=100 > zookeeper.sessiontimeout.ms=100 > Just start kafka and zookeeper and then pause zookeeper several times using > Ctrl-Z. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Updated] (KAFKA-1387) Kafka getting stuck creating ephemeral node it has already created when two zookeeper sessions are established in a very short period of time
[ https://issues.apache.org/jira/browse/KAFKA-1387?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Gwen Shapira updated KAFKA-1387: Priority: Critical (was: Blocker) > Kafka getting stuck creating ephemeral node it has already created when two > zookeeper sessions are established in a very short period of time > - > > Key: KAFKA-1387 > URL: https://issues.apache.org/jira/browse/KAFKA-1387 > Project: Kafka > Issue Type: Bug >Affects Versions: 0.8.1.1 >Reporter: Fedor Korotkiy >Assignee: Flavio Junqueira >Priority: Critical > Labels: newbie, patch, zkclient-problems > Fix For: 0.8.3 > > Attachments: KAFKA-1387.patch, kafka-1387.patch > > > Kafka broker re-registers itself in zookeeper every time handleNewSession() > callback is invoked. > https://github.com/apache/kafka/blob/0.8.1/core/src/main/scala/kafka/server/KafkaHealthcheck.scala > > Now imagine the following sequence of events. > 1) Zookeeper session reestablishes. handleNewSession() callback is queued by > the zkClient, but not invoked yet. > 2) Zookeeper session reestablishes again, queueing callback second time. > 3) First callback is invoked, creating /broker/[id] ephemeral path. > 4) Second callback is invoked and it tries to create /broker/[id] path using > createEphemeralPathExpectConflictHandleZKBug() function. But the path is > already exists, so createEphemeralPathExpectConflictHandleZKBug() is getting > stuck in the infinite loop. > Seems like controller election code have the same issue. > I'am able to reproduce this issue on the 0.8.1 branch from github using the > following configs. > # zookeeper > tickTime=10 > dataDir=/tmp/zk/ > clientPort=2101 > maxClientCnxns=0 > # kafka > broker.id=1 > log.dir=/tmp/kafka > zookeeper.connect=localhost:2101 > zookeeper.connection.timeout.ms=100 > zookeeper.sessiontimeout.ms=100 > Just start kafka and zookeeper and then pause zookeeper several times using > Ctrl-Z. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Updated] (KAFKA-1387) Kafka getting stuck creating ephemeral node it has already created when two zookeeper sessions are established in a very short period of time
[ https://issues.apache.org/jira/browse/KAFKA-1387?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Flavio Junqueira updated KAFKA-1387: Assignee: Flavio Junqueira Kafka getting stuck creating ephemeral node it has already created when two zookeeper sessions are established in a very short period of time - Key: KAFKA-1387 URL: https://issues.apache.org/jira/browse/KAFKA-1387 Project: Kafka Issue Type: Bug Affects Versions: 0.8.1.1 Reporter: Fedor Korotkiy Assignee: Flavio Junqueira Priority: Blocker Labels: newbie, patch, zkclient-problems Attachments: kafka-1387.patch Kafka broker re-registers itself in zookeeper every time handleNewSession() callback is invoked. https://github.com/apache/kafka/blob/0.8.1/core/src/main/scala/kafka/server/KafkaHealthcheck.scala Now imagine the following sequence of events. 1) Zookeeper session reestablishes. handleNewSession() callback is queued by the zkClient, but not invoked yet. 2) Zookeeper session reestablishes again, queueing callback second time. 3) First callback is invoked, creating /broker/[id] ephemeral path. 4) Second callback is invoked and it tries to create /broker/[id] path using createEphemeralPathExpectConflictHandleZKBug() function. But the path is already exists, so createEphemeralPathExpectConflictHandleZKBug() is getting stuck in the infinite loop. Seems like controller election code have the same issue. I'am able to reproduce this issue on the 0.8.1 branch from github using the following configs. # zookeeper tickTime=10 dataDir=/tmp/zk/ clientPort=2101 maxClientCnxns=0 # kafka broker.id=1 log.dir=/tmp/kafka zookeeper.connect=localhost:2101 zookeeper.connection.timeout.ms=100 zookeeper.sessiontimeout.ms=100 Just start kafka and zookeeper and then pause zookeeper several times using Ctrl-Z. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Updated] (KAFKA-1387) Kafka getting stuck creating ephemeral node it has already created when two zookeeper sessions are established in a very short period of time
[ https://issues.apache.org/jira/browse/KAFKA-1387?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Flavio Junqueira updated KAFKA-1387: Reviewer: Guozhang Wang (was: Flavio Junqueira) Kafka getting stuck creating ephemeral node it has already created when two zookeeper sessions are established in a very short period of time - Key: KAFKA-1387 URL: https://issues.apache.org/jira/browse/KAFKA-1387 Project: Kafka Issue Type: Bug Affects Versions: 0.8.1.1 Reporter: Fedor Korotkiy Assignee: Flavio Junqueira Priority: Blocker Labels: newbie, patch, zkclient-problems Attachments: KAFKA-1387.patch, kafka-1387.patch Kafka broker re-registers itself in zookeeper every time handleNewSession() callback is invoked. https://github.com/apache/kafka/blob/0.8.1/core/src/main/scala/kafka/server/KafkaHealthcheck.scala Now imagine the following sequence of events. 1) Zookeeper session reestablishes. handleNewSession() callback is queued by the zkClient, but not invoked yet. 2) Zookeeper session reestablishes again, queueing callback second time. 3) First callback is invoked, creating /broker/[id] ephemeral path. 4) Second callback is invoked and it tries to create /broker/[id] path using createEphemeralPathExpectConflictHandleZKBug() function. But the path is already exists, so createEphemeralPathExpectConflictHandleZKBug() is getting stuck in the infinite loop. Seems like controller election code have the same issue. I'am able to reproduce this issue on the 0.8.1 branch from github using the following configs. # zookeeper tickTime=10 dataDir=/tmp/zk/ clientPort=2101 maxClientCnxns=0 # kafka broker.id=1 log.dir=/tmp/kafka zookeeper.connect=localhost:2101 zookeeper.connection.timeout.ms=100 zookeeper.sessiontimeout.ms=100 Just start kafka and zookeeper and then pause zookeeper several times using Ctrl-Z. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Updated] (KAFKA-1387) Kafka getting stuck creating ephemeral node it has already created when two zookeeper sessions are established in a very short period of time
[ https://issues.apache.org/jira/browse/KAFKA-1387?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Flavio Junqueira updated KAFKA-1387: Attachment: KAFKA-1387.patch Given that it isn't clear that we will be getting curator as a dependency, I started a fix that pretty much relies on the ZK handle that ZkClient creates. Here is a preliminary patch that fixes the issues we have been discussing for the consumer registration by simply not retrying the creation of the registration znode across sessions. Given that I'm not using the ZkClient API, there is a bit of wiring to be done, but I hope it is ok. Kafka getting stuck creating ephemeral node it has already created when two zookeeper sessions are established in a very short period of time - Key: KAFKA-1387 URL: https://issues.apache.org/jira/browse/KAFKA-1387 Project: Kafka Issue Type: Bug Affects Versions: 0.8.1.1 Reporter: Fedor Korotkiy Assignee: Flavio Junqueira Priority: Blocker Labels: newbie, patch, zkclient-problems Attachments: KAFKA-1387.patch, kafka-1387.patch Kafka broker re-registers itself in zookeeper every time handleNewSession() callback is invoked. https://github.com/apache/kafka/blob/0.8.1/core/src/main/scala/kafka/server/KafkaHealthcheck.scala Now imagine the following sequence of events. 1) Zookeeper session reestablishes. handleNewSession() callback is queued by the zkClient, but not invoked yet. 2) Zookeeper session reestablishes again, queueing callback second time. 3) First callback is invoked, creating /broker/[id] ephemeral path. 4) Second callback is invoked and it tries to create /broker/[id] path using createEphemeralPathExpectConflictHandleZKBug() function. But the path is already exists, so createEphemeralPathExpectConflictHandleZKBug() is getting stuck in the infinite loop. Seems like controller election code have the same issue. I'am able to reproduce this issue on the 0.8.1 branch from github using the following configs. # zookeeper tickTime=10 dataDir=/tmp/zk/ clientPort=2101 maxClientCnxns=0 # kafka broker.id=1 log.dir=/tmp/kafka zookeeper.connect=localhost:2101 zookeeper.connection.timeout.ms=100 zookeeper.sessiontimeout.ms=100 Just start kafka and zookeeper and then pause zookeeper several times using Ctrl-Z. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Updated] (KAFKA-1387) Kafka getting stuck creating ephemeral node it has already created when two zookeeper sessions are established in a very short period of time
[ https://issues.apache.org/jira/browse/KAFKA-1387?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Flavio Junqueira updated KAFKA-1387: Reviewer: Flavio Junqueira (was: Jun Rao) Kafka getting stuck creating ephemeral node it has already created when two zookeeper sessions are established in a very short period of time - Key: KAFKA-1387 URL: https://issues.apache.org/jira/browse/KAFKA-1387 Project: Kafka Issue Type: Bug Affects Versions: 0.8.1.1 Reporter: Fedor Korotkiy Priority: Blocker Labels: newbie, patch, zkclient-problems Attachments: kafka-1387.patch Kafka broker re-registers itself in zookeeper every time handleNewSession() callback is invoked. https://github.com/apache/kafka/blob/0.8.1/core/src/main/scala/kafka/server/KafkaHealthcheck.scala Now imagine the following sequence of events. 1) Zookeeper session reestablishes. handleNewSession() callback is queued by the zkClient, but not invoked yet. 2) Zookeeper session reestablishes again, queueing callback second time. 3) First callback is invoked, creating /broker/[id] ephemeral path. 4) Second callback is invoked and it tries to create /broker/[id] path using createEphemeralPathExpectConflictHandleZKBug() function. But the path is already exists, so createEphemeralPathExpectConflictHandleZKBug() is getting stuck in the infinite loop. Seems like controller election code have the same issue. I'am able to reproduce this issue on the 0.8.1 branch from github using the following configs. # zookeeper tickTime=10 dataDir=/tmp/zk/ clientPort=2101 maxClientCnxns=0 # kafka broker.id=1 log.dir=/tmp/kafka zookeeper.connect=localhost:2101 zookeeper.connection.timeout.ms=100 zookeeper.sessiontimeout.ms=100 Just start kafka and zookeeper and then pause zookeeper several times using Ctrl-Z. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Updated] (KAFKA-1387) Kafka getting stuck creating ephemeral node it has already created when two zookeeper sessions are established in a very short period of time
[ https://issues.apache.org/jira/browse/KAFKA-1387?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Jun Rao updated KAFKA-1387: --- Reviewer: Jun Rao Kafka getting stuck creating ephemeral node it has already created when two zookeeper sessions are established in a very short period of time - Key: KAFKA-1387 URL: https://issues.apache.org/jira/browse/KAFKA-1387 Project: Kafka Issue Type: Bug Affects Versions: 0.8.1.1 Reporter: Fedor Korotkiy Priority: Blocker Labels: newbie, patch, zkclient-problems Attachments: kafka-1387.patch Kafka broker re-registers itself in zookeeper every time handleNewSession() callback is invoked. https://github.com/apache/kafka/blob/0.8.1/core/src/main/scala/kafka/server/KafkaHealthcheck.scala Now imagine the following sequence of events. 1) Zookeeper session reestablishes. handleNewSession() callback is queued by the zkClient, but not invoked yet. 2) Zookeeper session reestablishes again, queueing callback second time. 3) First callback is invoked, creating /broker/[id] ephemeral path. 4) Second callback is invoked and it tries to create /broker/[id] path using createEphemeralPathExpectConflictHandleZKBug() function. But the path is already exists, so createEphemeralPathExpectConflictHandleZKBug() is getting stuck in the infinite loop. Seems like controller election code have the same issue. I'am able to reproduce this issue on the 0.8.1 branch from github using the following configs. # zookeeper tickTime=10 dataDir=/tmp/zk/ clientPort=2101 maxClientCnxns=0 # kafka broker.id=1 log.dir=/tmp/kafka zookeeper.connect=localhost:2101 zookeeper.connection.timeout.ms=100 zookeeper.sessiontimeout.ms=100 Just start kafka and zookeeper and then pause zookeeper several times using Ctrl-Z. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Updated] (KAFKA-1387) Kafka getting stuck creating ephemeral node it has already created when two zookeeper sessions are established in a very short period of time
[ https://issues.apache.org/jira/browse/KAFKA-1387?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Neha Narkhede updated KAFKA-1387: - Priority: Blocker (was: Major) When this happens, there isn't a way to get out of this without killing the broker. Kafka getting stuck creating ephemeral node it has already created when two zookeeper sessions are established in a very short period of time - Key: KAFKA-1387 URL: https://issues.apache.org/jira/browse/KAFKA-1387 Project: Kafka Issue Type: Bug Affects Versions: 0.8.1.1 Reporter: Fedor Korotkiy Priority: Blocker Labels: newbie, patch Attachments: kafka-1387.patch Kafka broker re-registers itself in zookeeper every time handleNewSession() callback is invoked. https://github.com/apache/kafka/blob/0.8.1/core/src/main/scala/kafka/server/KafkaHealthcheck.scala Now imagine the following sequence of events. 1) Zookeeper session reestablishes. handleNewSession() callback is queued by the zkClient, but not invoked yet. 2) Zookeeper session reestablishes again, queueing callback second time. 3) First callback is invoked, creating /broker/[id] ephemeral path. 4) Second callback is invoked and it tries to create /broker/[id] path using createEphemeralPathExpectConflictHandleZKBug() function. But the path is already exists, so createEphemeralPathExpectConflictHandleZKBug() is getting stuck in the infinite loop. Seems like controller election code have the same issue. I'am able to reproduce this issue on the 0.8.1 branch from github using the following configs. # zookeeper tickTime=10 dataDir=/tmp/zk/ clientPort=2101 maxClientCnxns=0 # kafka broker.id=1 log.dir=/tmp/kafka zookeeper.connect=localhost:2101 zookeeper.connection.timeout.ms=100 zookeeper.sessiontimeout.ms=100 Just start kafka and zookeeper and then pause zookeeper several times using Ctrl-Z. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Updated] (KAFKA-1387) Kafka getting stuck creating ephemeral node it has already created when two zookeeper sessions are established in a very short period of time
[ https://issues.apache.org/jira/browse/KAFKA-1387?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Neha Narkhede updated KAFKA-1387: - Labels: newbie patch zkclient-problems (was: newbie patch) Kafka getting stuck creating ephemeral node it has already created when two zookeeper sessions are established in a very short period of time - Key: KAFKA-1387 URL: https://issues.apache.org/jira/browse/KAFKA-1387 Project: Kafka Issue Type: Bug Affects Versions: 0.8.1.1 Reporter: Fedor Korotkiy Priority: Blocker Labels: newbie, patch, zkclient-problems Attachments: kafka-1387.patch Kafka broker re-registers itself in zookeeper every time handleNewSession() callback is invoked. https://github.com/apache/kafka/blob/0.8.1/core/src/main/scala/kafka/server/KafkaHealthcheck.scala Now imagine the following sequence of events. 1) Zookeeper session reestablishes. handleNewSession() callback is queued by the zkClient, but not invoked yet. 2) Zookeeper session reestablishes again, queueing callback second time. 3) First callback is invoked, creating /broker/[id] ephemeral path. 4) Second callback is invoked and it tries to create /broker/[id] path using createEphemeralPathExpectConflictHandleZKBug() function. But the path is already exists, so createEphemeralPathExpectConflictHandleZKBug() is getting stuck in the infinite loop. Seems like controller election code have the same issue. I'am able to reproduce this issue on the 0.8.1 branch from github using the following configs. # zookeeper tickTime=10 dataDir=/tmp/zk/ clientPort=2101 maxClientCnxns=0 # kafka broker.id=1 log.dir=/tmp/kafka zookeeper.connect=localhost:2101 zookeeper.connection.timeout.ms=100 zookeeper.sessiontimeout.ms=100 Just start kafka and zookeeper and then pause zookeeper several times using Ctrl-Z. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Updated] (KAFKA-1387) Kafka getting stuck creating ephemeral node it has already created when two zookeeper sessions are established in a very short period of time
[ https://issues.apache.org/jira/browse/KAFKA-1387?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] James Lent updated KAFKA-1387: -- Labels: newbie patch (was: ) Affects Version/s: 0.8.1.1 Status: Patch Available (was: Open) Here is what I have so far. Comments welcomed. Kafka getting stuck creating ephemeral node it has already created when two zookeeper sessions are established in a very short period of time - Key: KAFKA-1387 URL: https://issues.apache.org/jira/browse/KAFKA-1387 Project: Kafka Issue Type: Bug Affects Versions: 0.8.1.1 Reporter: Fedor Korotkiy Labels: patch, newbie Kafka broker re-registers itself in zookeeper every time handleNewSession() callback is invoked. https://github.com/apache/kafka/blob/0.8.1/core/src/main/scala/kafka/server/KafkaHealthcheck.scala Now imagine the following sequence of events. 1) Zookeeper session reestablishes. handleNewSession() callback is queued by the zkClient, but not invoked yet. 2) Zookeeper session reestablishes again, queueing callback second time. 3) First callback is invoked, creating /broker/[id] ephemeral path. 4) Second callback is invoked and it tries to create /broker/[id] path using createEphemeralPathExpectConflictHandleZKBug() function. But the path is already exists, so createEphemeralPathExpectConflictHandleZKBug() is getting stuck in the infinite loop. Seems like controller election code have the same issue. I'am able to reproduce this issue on the 0.8.1 branch from github using the following configs. # zookeeper tickTime=10 dataDir=/tmp/zk/ clientPort=2101 maxClientCnxns=0 # kafka broker.id=1 log.dir=/tmp/kafka zookeeper.connect=localhost:2101 zookeeper.connection.timeout.ms=100 zookeeper.sessiontimeout.ms=100 Just start kafka and zookeeper and then pause zookeeper several times using Ctrl-Z. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Updated] (KAFKA-1387) Kafka getting stuck creating ephemeral node it has already created when two zookeeper sessions are established in a very short period of time
[ https://issues.apache.org/jira/browse/KAFKA-1387?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] James Lent updated KAFKA-1387: -- Attachment: kafka-1387.patch Kafka getting stuck creating ephemeral node it has already created when two zookeeper sessions are established in a very short period of time - Key: KAFKA-1387 URL: https://issues.apache.org/jira/browse/KAFKA-1387 Project: Kafka Issue Type: Bug Affects Versions: 0.8.1.1 Reporter: Fedor Korotkiy Labels: newbie, patch Attachments: kafka-1387.patch Kafka broker re-registers itself in zookeeper every time handleNewSession() callback is invoked. https://github.com/apache/kafka/blob/0.8.1/core/src/main/scala/kafka/server/KafkaHealthcheck.scala Now imagine the following sequence of events. 1) Zookeeper session reestablishes. handleNewSession() callback is queued by the zkClient, but not invoked yet. 2) Zookeeper session reestablishes again, queueing callback second time. 3) First callback is invoked, creating /broker/[id] ephemeral path. 4) Second callback is invoked and it tries to create /broker/[id] path using createEphemeralPathExpectConflictHandleZKBug() function. But the path is already exists, so createEphemeralPathExpectConflictHandleZKBug() is getting stuck in the infinite loop. Seems like controller election code have the same issue. I'am able to reproduce this issue on the 0.8.1 branch from github using the following configs. # zookeeper tickTime=10 dataDir=/tmp/zk/ clientPort=2101 maxClientCnxns=0 # kafka broker.id=1 log.dir=/tmp/kafka zookeeper.connect=localhost:2101 zookeeper.connection.timeout.ms=100 zookeeper.sessiontimeout.ms=100 Just start kafka and zookeeper and then pause zookeeper several times using Ctrl-Z. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
