did u get any scan results at all? check your region server and master hbase logs for any warnings..
also, just fyi - the standalone version of hbase is not super stable. i have had many similar problems in the past. the distributed mode is much much robust. thanks On Fri, Jan 13, 2012 at 2:36 PM, Joel Halbert <[email protected]> wrote: > I have a standalone instance of HBASE (single instance, on localhost). > > After reading a few thousand records using a scanner my thread is stuck > waiting: > > "main" prio=10 tid=0x00000000016d4800 nid=0xf3a in Object.wait() > [0x00007fbe96dc3000] > java.lang.Thread.State: WAITING (on object monitor) > at java.lang.Object.wait(Native Method) > at java.lang.Object.wait(Object.**java:503) > at org.apache.hadoop.hbase.ipc.**HBaseClient.call(HBaseClient.** > java:757) > - locked <0x00000007e2ba21d0> (a org.apache.hadoop.hbase.ipc.** > HBaseClient$Call) > at org.apache.hadoop.hbase.ipc.**HBaseRPC$Invoker.invoke(** > HBaseRPC.java:257) > at $Proxy4.next(Unknown Source) > at org.apache.hadoop.hbase.**client.ScannerCallable.call(** > ScannerCallable.java:79) > at org.apache.hadoop.hbase.**client.ScannerCallable.call(** > ScannerCallable.java:38) > at org.apache.hadoop.hbase.**client.HConnectionManager$** > HConnectionImplementation.**getRegionServerWithRetries(** > HConnectionManager.java:1019) > at org.apache.hadoop.hbase.**client.MetaScanner.metaScan(** > MetaScanner.java:182) > at org.apache.hadoop.hbase.**client.MetaScanner.metaScan(** > MetaScanner.java:95) > at org.apache.hadoop.hbase.**client.HConnectionManager$** > HConnectionImplementation.**prefetchRegionCache(** > HConnectionManager.java:649) > at org.apache.hadoop.hbase.**client.HConnectionManager$** > HConnectionImplementation.**locateRegionInMeta(** > HConnectionManager.java:703) > - locked <0x00000007906dfcf8> (a java.lang.Object) > at org.apache.hadoop.hbase.**client.HConnectionManager$** > HConnectionImplementation.**locateRegion(**HConnectionManager.java:594) > at org.apache.hadoop.hbase.**client.HConnectionManager$** > HConnectionImplementation.**locateRegion(**HConnectionManager.java:559) > at org.apache.hadoop.hbase.**client.HConnectionManager$** > HConnectionImplementation.**getRegionLocation(** > HConnectionManager.java:416) > at org.apache.hadoop.hbase.**client.ServerCallable.**instantiateServer( > **ServerCallable.java:57) > at org.apache.hadoop.hbase.**client.ScannerCallable.** > instantiateServer(**ScannerCallable.java:63) > at org.apache.hadoop.hbase.**client.HConnectionManager$** > HConnectionImplementation.**getRegionServerWithRetries(** > HConnectionManager.java:1018) > at org.apache.hadoop.hbase.**client.HTable$ClientScanner.** > nextScanner(HTable.java:1104) > at org.apache.hadoop.hbase.**client.HTable$ClientScanner.** > next(HTable.java:1196) > at org.apache.hadoop.hbase.**client.HTable$ClientScanner$1.** > hasNext(HTable.java:1256) > at crawler.cache.PageCache.**accept(PageCache.java:254) > > > > Concretely, it is stuck on the iterator.next method: > > Scan scan = new Scan(Bytes.toBytes(**hostnameTarget), > Bytes.toBytes(hostnameTarget + (char) 127)); > scan.setMaxVersions(1); > scan.setCaching(4); > ResultScanner resscan = table.getScanner(scan); > Iterator<Result> it = resscan.iterator(); > while (it.hasNext()) { // stuck here > > > > Any clues? >
