fwiw stop_replication is a kill switch, not a general way to start and stop replicating, and start_replication may put you in an inconsistent state:
hbase(main):001:0> help 'stop_replication' Stops all the replication features. The state in which each stream stops in is undetermined. WARNING: start/stop replication is only meant to be used in critical load situations. On Thu, May 23, 2013 at 1:17 AM, Amit Mor <amit.mor.m...@gmail.com> wrote: > No the server came out fine just because after the crash (RS's - the > masters were still running), I immediately pulled the breaks with > stop_replication. Then I start the RS's and they came back fine (not > replicating). Once I hit 'start_replication' again they had crashed for the > second time. Eventually I deleted the heavily nested replication znodes and > the 'start_replication' succeeded. I didn't patch 8207 because I'm on CDH > with Cloudera Manager Parcels thing and I'm still trying to figure out how > to replace their jars with mine in a clean and non intrusive way > > > On Thu, May 23, 2013 at 10:33 AM, Varun Sharma <va...@pinterest.com> wrote: > >> Actually, it seems like something else was wrong here - the servers came up >> just fine on trying again - so could not really reproduce the issue. >> >> Amit: Did you try patching 8207 ? >> >> Varun >> >> >> On Wed, May 22, 2013 at 5:40 PM, Himanshu Vashishtha <hv.cs...@gmail.com >> >wrote: >> >> > That sounds like a bug for sure. Could you create a jira with logs/znode >> > dump/steps to reproduce it? >> > >> > Thanks, >> > himanshu >> > >> > >> > On Wed, May 22, 2013 at 5:01 PM, Varun Sharma <va...@pinterest.com> >> wrote: >> > >> > > It seems I can reproduce this - I did a few rolling restarts and got >> > > screwed with NoNode exceptions - I am running 0.94.7 which has the fix >> > but >> > > my nodes don't contain hyphens - nodes are no longer coming back up... >> > > >> > > Thanks >> > > Varun >> > > >> > > >> > > On Wed, May 22, 2013 at 3:02 PM, Himanshu Vashishtha < >> hv.cs...@gmail.com >> > > >wrote: >> > > >> > > > I'd suggest to please patch the code with 8207; cdh4.2.1 doesn't >> have >> > > it. >> > > > >> > > > With hyphens in the name, ReplicationSource gets confused and tried >> to >> > > set >> > > > data in a znode which doesn't exist. >> > > > >> > > > Thanks, >> > > > Himanshu >> > > > >> > > > >> > > > On Wed, May 22, 2013 at 2:42 PM, Amit Mor <amit.mor.m...@gmail.com> >> > > wrote: >> > > > >> > > > > yes, indeed - hyphens are part of the host name (annoying legacy >> > stuff >> > > in >> > > > > my company). It's hbase-0.94.2-cdh4.2.1. I have no idea if 0.94.6 >> was >> > > > > backported by Cloudera into their flavor of 0.94.2, but >> > > > > the mysterious occurrence of the percent sign in zkcli (ls >> > > > > >> > > > > >> > > > >> > > >> > >> /hbase/replication/rs/va-p-hbase-02-d,60020,1369249862401/1-va-p-hbase-02-e,60020,1369042377129-va-p-hbase-02-c,60020,1369042377731-va-p-hbase-02-d,60020,1369233252475/va-p-hbase-02-e%2C60020%2C1369042377129.1369227474895) >> > > > > might be a sign for such problem. How deep should my rmr in zkcli >> (an >> > > > > example would be most welcomed :) be ? I have no serious problem >> > > running >> > > > > copyTable with a time period corresponding to the outage and then >> to >> > > > start >> > > > > the sync back again. One question though, how did it cause a crash >> ? >> > > > > >> > > > > >> > > > > On Thu, May 23, 2013 at 12:32 AM, Varun Sharma < >> va...@pinterest.com> >> > > > > wrote: >> > > > > >> > > > > > I believe there were cascading failures which got these deep >> nodes >> > > > > > containing still to be replicated WAL(s) - I suspect there is >> > either >> > > > some >> > > > > > parsing bug or something which is causing the replication source >> to >> > > not >> > > > > > work - also which version are you using - does it have >> > > > > > https://issues.apache.org/jira/browse/HBASE-8207 - since you use >> > > > hyphens >> > > > > > in >> > > > > > our paths. One way to get back up is to delete these nodes but >> then >> > > you >> > > > > > lose data in these WAL(s)... >> > > > > > >> > > > > > >> > > > > > On Wed, May 22, 2013 at 2:22 PM, Amit Mor < >> amit.mor.m...@gmail.com >> > > >> > > > > wrote: >> > > > > > >> > > > > > > va-p-hbase-02-d,60020,1369249862401 >> > > > > > > >> > > > > > > >> > > > > > > On Thu, May 23, 2013 at 12:20 AM, Varun Sharma < >> > > va...@pinterest.com> >> > > > > > > wrote: >> > > > > > > >> > > > > > > > Basically >> > > > > > > > >> > > > > > > > ls /hbase/rs and what do you see for va-p-02-d ? >> > > > > > > > >> > > > > > > > >> > > > > > > > On Wed, May 22, 2013 at 2:19 PM, Varun Sharma < >> > > va...@pinterest.com >> > > > > >> > > > > > > wrote: >> > > > > > > > >> > > > > > > > > Can you do ls /hbase/rs and see what you get for 02-d - >> > instead >> > > > of >> > > > > > > > looking >> > > > > > > > > in /replication/, could you look in /hbase/replication/rs >> - I >> > > > want >> > > > > to >> > > > > > > see >> > > > > > > > > if the timestamps are matching or not ? >> > > > > > > > > >> > > > > > > > > Varun >> > > > > > > > > >> > > > > > > > > >> > > > > > > > > On Wed, May 22, 2013 at 2:17 PM, Varun Sharma < >> > > > va...@pinterest.com >> > > > > > >> > > > > > > > wrote: >> > > > > > > > > >> > > > > > > > >> I see - so looks okay - there's just a lot of deep nesting >> > in >> > > > > there >> > > > > > - >> > > > > > > if >> > > > > > > > >> you look into these you nodes by doing ls - you should >> see a >> > > > bunch >> > > > > > of >> > > > > > > > >> WAL(s) which still need to be replicated... >> > > > > > > > >> >> > > > > > > > >> Varun >> > > > > > > > >> >> > > > > > > > >> >> > > > > > > > >> On Wed, May 22, 2013 at 2:16 PM, Varun Sharma < >> > > > > va...@pinterest.com >> > > > > > > > >wrote: >> > > > > > > > >> >> > > > > > > > >>> 2013-05-22 15:31:25,929 WARN >> > > > > > > > >>> org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper: >> > > > Possibly >> > > > > > > > transient >> > > > > > > > >>> ZooKeeper exception: >> > > > > > > > >>> >> > org.apache.zookeeper.KeeperException$SessionExpiredException: >> > > > > > > > >>> KeeperErrorCode = Session expired for * >> > > > > > > > >>> >> > > > > > > > >> > > > > > > >> > > > > > >> > > > > >> > > > >> > > >> > >> /hbase/replication/rs/va-p-hbase-01-c,60020,1369249873379/1-va-p-hbase-01-c,60020,1369042378287-va-p-hbase-02-c,60020,1369042377731-va-p-hbase-02-d,60020,1369233252475/va-p-hbase-01-c%2C60020%2C1369042378287.1369220050719 >> > > > > > > > >>> * >> > > > > > > > >>> * >> > > > > > > > >>> * >> > > > > > > > >>> *01->[01->02->02]->01* >> > > > > > > > >>> >> > > > > > > > >>> *Looks like a bunch of cascading failures causing this >> deep >> > > > > > > nesting... >> > > > > > > > * >> > > > > > > > >>> >> > > > > > > > >>> >> > > > > > > > >>> On Wed, May 22, 2013 at 2:09 PM, Amit Mor < >> > > > > amit.mor.m...@gmail.com >> > > > > > > > >wrote: >> > > > > > > > >>> >> > > > > > > > >>>> empty return: >> > > > > > > > >>>> >> > > > > > > > >>>> [zk: va-p-zookeeper-01-c:2181(CONNECTED) 10] ls >> > > > > > > > >>>> >> > /hbase/replication/rs/va-p-hbase-01-c,60020,1369249873379/1 >> > > > > > > > >>>> [] >> > > > > > > > >>>> >> > > > > > > > >>>> >> > > > > > > > >>>> >> > > > > > > > >>>> On Thu, May 23, 2013 at 12:05 AM, Varun Sharma < >> > > > > > va...@pinterest.com >> > > > > > > > >> > > > > > > > >>>> wrote: >> > > > > > > > >>>> >> > > > > > > > >>>> > Do an "ls" not a get here and give the output ? >> > > > > > > > >>>> > >> > > > > > > > >>>> > ls >> > > > /hbase/replication/rs/va-p-hbase-01-c,60020,1369249873379/1 >> > > > > > > > >>>> > >> > > > > > > > >>>> > >> > > > > > > > >>>> > On Wed, May 22, 2013 at 1:53 PM, >> > amit.mor.m...@gmail.com< >> > > > > > > > >>>> > amit.mor.m...@gmail.com> wrote: >> > > > > > > > >>>> > >> > > > > > > > >>>> > > [zk: va-p-zookeeper-01-c:2181(CONNECTED) 3] get >> > > > > > > > >>>> > > >> > > > /hbase/replication/rs/va-p-hbase-01-c,60020,1369249873379/1 >> > > > > > > > >>>> > > >> > > > > > > > >>>> > > cZxid = 0x60281c1de >> > > > > > > > >>>> > > ctime = Wed May 22 15:11:17 EDT 2013 >> > > > > > > > >>>> > > mZxid = 0x60281c1de >> > > > > > > > >>>> > > mtime = Wed May 22 15:11:17 EDT 2013 >> > > > > > > > >>>> > > pZxid = 0x60281c1de >> > > > > > > > >>>> > > cversion = 0 >> > > > > > > > >>>> > > dataVersion = 0 >> > > > > > > > >>>> > > aclVersion = 0 >> > > > > > > > >>>> > > ephemeralOwner = 0x0 >> > > > > > > > >>>> > > dataLength = 0 >> > > > > > > > >>>> > > numChildren = 0 >> > > > > > > > >>>> > > >> > > > > > > > >>>> > > >> > > > > > > > >>>> > > >> > > > > > > > >>>> > > On Wed, May 22, 2013 at 11:49 PM, Ted Yu < >> > > > > yuzhih...@gmail.com >> > > > > > > >> > > > > > > > >>>> wrote: >> > > > > > > > >>>> > > >> > > > > > > > >>>> > > > What does this command show you ? >> > > > > > > > >>>> > > > >> > > > > > > > >>>> > > > get >> > > > > > > /hbase/replication/rs/va-p-hbase-01-c,60020,1369249873379/1 >> > > > > > > > >>>> > > > >> > > > > > > > >>>> > > > Cheers >> > > > > > > > >>>> > > > >> > > > > > > > >>>> > > > On Wed, May 22, 2013 at 1:46 PM, >> > > > amit.mor.m...@gmail.com< >> > > > > > > > >>>> > > > amit.mor.m...@gmail.com> wrote: >> > > > > > > > >>>> > > > >> > > > > > > > >>>> > > > > ls >> > > > > > /hbase/replication/rs/va-p-hbase-01-c,60020,1369249873379 >> > > > > > > > >>>> > > > > [1] >> > > > > > > > >>>> > > > > [zk: va-p-zookeeper-01-c:2181(CONNECTED) 2] ls >> > > > > > > > >>>> > > > > >> > > > > > /hbase/replication/rs/va-p-hbase-01-c,60020,1369249873379/1 >> > > > > > > > >>>> > > > > [] >> > > > > > > > >>>> > > > > >> > > > > > > > >>>> > > > > I'm on hbase-0.94.2-cdh4.2.1 >> > > > > > > > >>>> > > > > >> > > > > > > > >>>> > > > > Thanks >> > > > > > > > >>>> > > > > >> > > > > > > > >>>> > > > > >> > > > > > > > >>>> > > > > On Wed, May 22, 2013 at 11:40 PM, Varun Sharma < >> > > > > > > > >>>> va...@pinterest.com> >> > > > > > > > >>>> > > > > wrote: >> > > > > > > > >>>> > > > > >> > > > > > > > >>>> > > > > > Also what version of HBase are you running ? >> > > > > > > > >>>> > > > > > >> > > > > > > > >>>> > > > > > >> > > > > > > > >>>> > > > > > On Wed, May 22, 2013 at 1:38 PM, Varun Sharma >> < >> > > > > > > > >>>> va...@pinterest.com >> > > > > > > > >>>> > > >> > > > > > > > >>>> > > > > wrote: >> > > > > > > > >>>> > > > > > >> > > > > > > > >>>> > > > > > > Basically, >> > > > > > > > >>>> > > > > > > >> > > > > > > > >>>> > > > > > > You had va-p-hbase-02 crash - that caused >> all >> > > the >> > > > > > > > >>>> replication >> > > > > > > > >>>> > > related >> > > > > > > > >>>> > > > > > data >> > > > > > > > >>>> > > > > > > in zookeeper to be moved to va-p-hbase-01 >> and >> > > have >> > > > > it >> > > > > > > take >> > > > > > > > >>>> over >> > > > > > > > >>>> > for >> > > > > > > > >>>> > > > > > > replicating 02's logs. Now each region >> server >> > > also >> > > > > > > > >>>> maintains an >> > > > > > > > >>>> > > > > in-memory >> > > > > > > > >>>> > > > > > > state of whats in ZK, it seems like when you >> > > start >> > > > > up >> > > > > > > 01, >> > > > > > > > >>>> its >> > > > > > > > >>>> > > trying >> > > > > > > > >>>> > > > to >> > > > > > > > >>>> > > > > > > replicate the 02 logs underneath but its >> > failing >> > > > to >> > > > > > > > because >> > > > > > > > >>>> that >> > > > > > > > >>>> > > data >> > > > > > > > >>>> > > > > is >> > > > > > > > >>>> > > > > > > not in ZK. This is somewhat weird... >> > > > > > > > >>>> > > > > > > >> > > > > > > > >>>> > > > > > > Can you open the zookeepeer shell and do >> > > > > > > > >>>> > > > > > > >> > > > > > > > >>>> > > > > > > ls >> > > > > > > > /hbase/replication/rs/va-p-hbase-01-c,60020,1369249873379 >> > > > > > > > >>>> > > > > > > >> > > > > > > > >>>> > > > > > > And give the output ? >> > > > > > > > >>>> > > > > > > >> > > > > > > > >>>> > > > > > > >> > > > > > > > >>>> > > > > > > On Wed, May 22, 2013 at 1:27 PM, >> > > > > > > amit.mor.m...@gmail.com< >> > > > > > > > >>>> > > > > > > amit.mor.m...@gmail.com> wrote: >> > > > > > > > >>>> > > > > > > >> > > > > > > > >>>> > > > > > >> Hi, >> > > > > > > > >>>> > > > > > >> >> > > > > > > > >>>> > > > > > >> This is bad ... and happened twice: I had >> my >> > > > > > > > >>>> replication-slave >> > > > > > > > >>>> > > > cluster >> > > > > > > > >>>> > > > > > >> offlined. I performed quite a massive Merge >> > > > > operation >> > > > > > > on >> > > > > > > > >>>> it and >> > > > > > > > >>>> > > > after >> > > > > > > > >>>> > > > > a >> > > > > > > > >>>> > > > > > >> couple of hours it had finished and I >> > returned >> > > it >> > > > > > back >> > > > > > > > >>>> online. >> > > > > > > > >>>> > At >> > > > > > > > >>>> > > > the >> > > > > > > > >>>> > > > > > same >> > > > > > > > >>>> > > > > > >> time, the replication-master RS machines >> > > crashed >> > > > > (see >> > > > > > > > first >> > > > > > > > >>>> > crash >> > > > > > > > >>>> > > > > > >> http://pastebin.com/1msNZ2tH) with the >> first >> > > > > > exception >> > > > > > > > >>>> being: >> > > > > > > > >>>> > > > > > >> >> > > > > > > > >>>> > > > > > >> >> > > > > org.apache.zookeeper.KeeperException$NoNodeException: >> > > > > > > > >>>> > > > KeeperErrorCode >> > > > > > > > >>>> > > > > = >> > > > > > > > >>>> > > > > > >> NoNode for >> > > > > > > > >>>> > > > > > >> >> > > > > > > > >>>> > > > > > >> >> > > > > > > > >>>> > > > > > >> > > > > > > > >>>> > > > > >> > > > > > > > >>>> > > > >> > > > > > > > >>>> > > >> > > > > > > > >>>> > >> > > > > > > > >>>> >> > > > > > > > >> > > > > > > >> > > > > > >> > > > > >> > > > >> > > >> > >> /hbase/replication/rs/va-p-hbase-01-c,60020,1369233253404/1-va-p-hbase-01-c,60020,1369042378287-va-p-hbase-02-c,60020,1369042377731/va-p-hbase-01-c%2C60020%2C1369042378287.1369220050719 >> > > > > > > > >>>> > > > > > >> at >> > > > > > > > >>>> > > > > > >> >> > > > > > > > >>>> > > > >> > > > > > > > >>>> >> > > > > > > >> > > org.apache.zookeeper.KeeperException.create(KeeperException.java:111) >> > > > > > > > >>>> > > > > > >> at >> > > > > > > > >>>> > > > > > >> >> > > > > > > > >>>> > > >> > > > > > > > >> > > > org.apache.zookeeper.KeeperException.create(KeeperException.java:51) >> > > > > > > > >>>> > > > > > >> at >> > > > > > > > >>>> > > > >> > > > > org.apache.zookeeper.ZooKeeper.setData(ZooKeeper.java:1266) >> > > > > > > > >>>> > > > > > >> at >> > > > > > > > >>>> > > > > > >> >> > > > > > > > >>>> > > > > > >> >> > > > > > > > >>>> > > > > > >> > > > > > > > >>>> > > > > >> > > > > > > > >>>> > > > >> > > > > > > > >>>> > > >> > > > > > > > >>>> > >> > > > > > > > >>>> >> > > > > > > > >> > > > > > > >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.setData(RecoverableZooKeeper.java:354) >> > > > > > > > >>>> > > > > > >> at >> > > > > > > > >>>> > > > > > >> >> > > > > > > > >>>> > >> > > > > > org.apache.hadoop.hbase.zookeeper.ZKUtil.setData(ZKUtil.java:846) >> > > > > > > > >>>> > > > > > >> at >> > > > > > > > >>>> > > > > > >> >> > > > > > > > >>>> > >> > > > > > org.apache.hadoop.hbase.zookeeper.ZKUtil.setData(ZKUtil.java:898) >> > > > > > > > >>>> > > > > > >> at >> > > > > > > > >>>> > > > > > >> >> > > > > > > > >>>> > >> > > > > > org.apache.hadoop.hbase.zookeeper.ZKUtil.setData(ZKUtil.java:892) >> > > > > > > > >>>> > > > > > >> at >> > > > > > > > >>>> > > > > > >> >> > > > > > > > >>>> > > > > > >> >> > > > > > > > >>>> > > > > > >> > > > > > > > >>>> > > > > >> > > > > > > > >>>> > > > >> > > > > > > > >>>> > > >> > > > > > > > >>>> > >> > > > > > > > >>>> >> > > > > > > > >> > > > > > > >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.replication.ReplicationZookeeper.writeReplicationStatus(ReplicationZookeeper.java:558) >> > > > > > > > >>>> > > > > > >> at >> > > > > > > > >>>> > > > > > >> >> > > > > > > > >>>> > > > > > >> >> > > > > > > > >>>> > > > > > >> > > > > > > > >>>> > > > > >> > > > > > > > >>>> > > > >> > > > > > > > >>>> > > >> > > > > > > > >>>> > >> > > > > > > > >>>> >> > > > > > > > >> > > > > > > >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.replication.regionserver.ReplicationSourceManager.logPositionAndCleanOldLogs(ReplicationSourceManager.java:154) >> > > > > > > > >>>> > > > > > >> at >> > > > > > > > >>>> > > > > > >> >> > > > > > > > >>>> > > > > > >> >> > > > > > > > >>>> > > > > > >> > > > > > > > >>>> > > > > >> > > > > > > > >>>> > > > >> > > > > > > > >>>> > > >> > > > > > > > >>>> > >> > > > > > > > >>>> >> > > > > > > > >> > > > > > > >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.replication.regionserver.ReplicationSource.shipEdits(ReplicationSource.java:638) >> > > > > > > > >>>> > > > > > >> at >> > > > > > > > >>>> > > > > > >> >> > > > > > > > >>>> > > > > > >> >> > > > > > > > >>>> > > > > > >> > > > > > > > >>>> > > > > >> > > > > > > > >>>> > > > >> > > > > > > > >>>> > > >> > > > > > > > >>>> > >> > > > > > > > >>>> >> > > > > > > > >> > > > > > > >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.replication.regionserver.ReplicationSource.run(ReplicationSource.java:387) >> > > > > > > > >>>> > > > > > >> >> > > > > > > > >>>> > > > > > >> Before restarting the crashed RS's, I have >> > > > applied >> > > > > a >> > > > > > > > >>>> > > > > 'stop_replication' >> > > > > > > > >>>> > > > > > >> cmd. Then fired up the RS's again. They've >> > > > started >> > > > > > o.k. >> > > > > > > > >>>> but once >> > > > > > > > >>>> > > > I've >> > > > > > > > >>>> > > > > > hit >> > > > > > > > >>>> > > > > > >> 'start_replication' they have crashed once >> > > again. >> > > > > The >> > > > > > > > >>>> second >> > > > > > > > >>>> > crash >> > > > > > > > >>>> > > > log >> > > > > > > > >>>> > > > > > >> http://pastebin.com/8Nb5epJJ has the same >> > > > initial >> > > > > > > > >>>> exception >> > > > > > > > >>>> > > > > > >> >> > > > > > (org.apache.zookeeper.KeeperException$NoNodeException: >> > > > > > > > >>>> > > > > > >> KeeperErrorCode = NoNode). I've started the >> > > crash >> > > > > > > region >> > > > > > > > >>>> servers >> > > > > > > > >>>> > > > again >> > > > > > > > >>>> > > > > > >> without replication and currently all is >> > well, >> > > > but >> > > > > I >> > > > > > > need >> > > > > > > > >>>> to >> > > > > > > > >>>> > start >> > > > > > > > >>>> > > > > > >> replication asap. >> > > > > > > > >>>> > > > > > >> >> > > > > > > > >>>> > > > > > >> Does anyone have an idea what's going on >> and >> > > how >> > > > > can >> > > > > > I >> > > > > > > > >>>> solve it >> > > > > > > > >>>> > ? >> > > > > > > > >>>> > > > > > >> >> > > > > > > > >>>> > > > > > >> Thanks, >> > > > > > > > >>>> > > > > > >> Amit >> > > > > > > > >>>> > > > > > >> >> > > > > > > > >>>> > > > > > > >> > > > > > > > >>>> > > > > > > >> > > > > > > > >>>> > > > > > >> > > > > > > > >>>> > > > > >> > > > > > > > >>>> > > > >> > > > > > > > >>>> > > >> > > > > > > > >>>> > >> > > > > > > > >>>> >> > > > > > > > >>> >> > > > > > > > >>> >> > > > > > > > >> >> > > > > > > > > >> > > > > > > > >> > > > > > > >> > > > > > >> > > > > >> > > > >> > > >> > >>
