> On Sep 24, 2015, at 8:11 PM, Todd Palino <tpal...@gmail.com> wrote: > > Well, in general you can't currently use compressed messages in any topic > that has compaction turned on regardless of whether or not you are using > Kafka-committed offsets. The log compaction thread will die either way. > There's only one compression thread for the broker that runs on all topics > that use compaction. > > Jason, to address your question, it's probably wise to wait for now. > Zookeeper offsets work, so unless it's broke, don't fix it for now. We're > using Kafka-committed offsets at LinkedIn for our mirror makers and our > auditor application (both of which are considered infrastructure > applications for Kafka), but we're not encouraging other internal users to > switch over just yet. >
Burrow depends on kafka-commited offsets, doesn’t it? I guess that means Burrow is only being used to monitor your mirror makers and auditor application, then? -James > -Todd > > > On Wed, Sep 23, 2015 at 3:21 PM, James Cheng <jch...@tivo.com> wrote: > >> >> On Sep 18, 2015, at 10:25 AM, Todd Palino <tpal...@gmail.com> wrote: >> >>> I think the last major issue with log compaction (that it couldn't handle >>> compressed messages) was committed as part of >>> https://issues.apache.org/jira/browse/KAFKA-1374 in August, but I'm not >>> certain what version this will end up in. It may be part of 0.8.2.2. >>> >>> Regardless, you'll probably be OK now. We've found that once we clean >> this >>> issue up once it doesn't appear to recur. As long as you're not writing >> in >>> compressed messages to a log compacted topic (and that won't happen with >>> __consumer_offsets, as it's managed by the brokers themselves - it would >>> only be if you were using other log compacted topics), you're likely in >> the >>> clear now. >>> >> >> Todd, >> >> If I understand your description of the problem, you are saying that >> enabling log compaction on a topic with compressed messages can (will?) >> cause the log cleaner to crash when it encounters those compressed >> messages. And the death of the cleaner thread will prevent log compaction >> from running on other topics, even ones that don't have compressed messages. >> >> That means if we have a cluster where we want to use log compaction on >> *any* topic, we need to either: >> 1) apply https://issues.apache.org/jira/browse/KAFKA-1374 (or upgrade to >> some version it is applied) >> OR >> 2) make sure that we don't use compressed messages in *any* topic that has >> log compaction turned on. >> >> And, more specifically, if we want to make use of __consumer_offsets, then >> we cannot use compressed messages in any topic that has compaction turned >> on. >> >> Is that right? >> -James >> >>> -Todd >>> >>> >>> On Fri, Sep 18, 2015 at 9:54 AM, John Holland < >>> john.holl...@objectpartners.com> wrote: >>> >>>> Thanks! >>>> >>>> I did what you suggested and it worked except it was necessary for me to >>>> remove the cleaner-offset-checkpoint file from the data directory and >>>> restart the servers. The log indicates all is well. >>>> >>>> Do you know what version the fix to this will be in? I'm not looking >>>> forward to dealing with this on a reoccurring basis. >>>> >>>> -John >>>> >>>> On Fri, Sep 18, 2015 at 8:48 AM Todd Palino <tpal...@gmail.com> wrote: >>>> >>>>> Yes, this is a known concern, and it should be fixed with recent >> commits. >>>>> In the meantime, you'll have to do a little manual cleanup. >>>>> >>>>> The problem you're running into is a corrupt message in the offsets >>>> topic. >>>>> We've seen this a lot. What you need to do is set the topic >> configuration >>>>> to remove the cleanup.policy config, and set retention.ms and >> segment.ms >>>>> to >>>>> something reasonably low. I suggest using a value of 3 or 4 times your >>>>> commit interval for consumers. Then wait until the log segments are >>>> reaped >>>>> (wait twice as long as the retention.ms you chose, to be safe). Once >>>> this >>>>> is done, you can set the topic configuration back the way it was >> (remove >>>>> segment.ms and retention.ms configs, and set cleanup.policy=compact). >>>>> Lastly, you'll need to do a rolling bounce of the cluster to restart >> the >>>>> brokers (which restarts the log cleaner threads). Technically, you only >>>>> need to restart brokers where the threads have died, but it's easier to >>>>> just restart all of them. >>>>> >>>>> Keep in mind that when you do this, you are deleting old offsets. If >> your >>>>> consumers are all live and healthy, this shouldn't be a problem because >>>>> they will just continue to commit their offsets properly. But if you >> have >>>>> an offline consumer, you'll lose the committed offsets by doing this. >>>>> >>>>> -Todd >>>>> >>>>> >>>>> On Fri, Sep 18, 2015 at 5:31 AM, John Holland < >>>>> john.holl...@objectpartners.com> wrote: >>>>> >>>>>> I've been experiencing this issue across several of our environments >>>> ever >>>>>> since we enabled the log cleaner for the __consumer_offsets topic. >>>>>> >>>>>> We are on version 0.8.2.1 of kafka, using the new producer. All of >> our >>>>>> consumers are set to commit to kafka only. >>>>>> >>>>>> Below is the stack trace in the log I've encountered across several >>>>>> different clusters. A simple restart of kafka will allow compaction >> to >>>>>> continue on all of the other partitions but the incorrect one will >>>> always >>>>>> fail. >>>>>> >>>>>> Here are the values for it from the kafka-topics --describe command: >>>>>> >>>>>> Topic:__consumer_offsets PartitionCount:50 ReplicationFactor:3 >>>>>> Configs:segment.bytes=104857600,cleanup.policy=compact >>>>>> >>>>>> Are there any recommendations on how to prevent this and the best way >>>> to >>>>>> recover from this exception? This is causing disk space to fill up >>>>> quickly >>>>>> on the node. >>>>>> >>>>>> I did see an open issue that seems very similar to this >>>>>> https://issues.apache.org/jira/browse/KAFKA-1641 but this is the >>>>>> __consumer_offsets topic which I have not had any part in setting up >>>> nor >>>>>> producing to. >>>>>> >>>>>> [2015-09-18 02:57:25,520] INFO Cleaner 0: Beginning cleaning of log >>>>>> __consumer_offsets-17. (kafka.log.LogCleaner) >>>>>> [2015-09-18 02:57:25,520] INFO Cleaner 0: Building offset map for >>>>>> __consumer_offsets-17... (kafka.log.LogCleaner) >>>>>> [2015-09-18 02:57:25,609] INFO Cleaner 0: Building offset map for log >>>>>> __consumer_offsets-17 for 46 segments in offset range [468079184, >>>>>> 528707475). (kafka.log.LogCleaner) >>>>>> [2015-09-18 02:57:25,645] ERROR [kafka-log-cleaner-thread-0], Error >> due >>>>> to >>>>>> (kafka.log.LogCleaner) >>>>>> java.lang.IllegalArgumentException: requirement failed: Last clean >>>> offset >>>>>> is 468079184 but segment base offset is 0 for log >>>> __consumer_offsets-17. >>>>>> at scala.Predef$.require(Predef.scala:233) >>>>>> at kafka.log.Cleaner.buildOffsetMap(LogCleaner.scala:509) >>>>>> at kafka.log.Cleaner.clean(LogCleaner.scala:307) >>>>>> at >>>>>> kafka.log.LogCleaner$CleanerThread.cleanOrSleep(LogCleaner.scala:221) >>>>>> at >>>>> kafka.log.LogCleaner$CleanerThread.doWork(LogCleaner.scala:199) >>>>>> at >>>>> kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:60) >>>>>> [2015-09-18 02:57:25,654] INFO [kafka-log-cleaner-thread-0], Stopped >>>>>> (kafka.log.LogCleaner) >>>>>> >>>>>> -John >>>>>> >>>>> >>>> >> >> ________________________________ This email and any attachments may contain confidential and privileged material for the sole use of the intended recipient. 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