On 2/18/12 12:02 PM, Stack wrote:
What version are you running?
HBase 0.90.4 / hadoop 0.20.2
I don't see any explicit NPE mentions in the commit log on HConnectionManager. Maybe its still an issue? St.Ack
ok, thanks for the sanity check. I'll dig a little deeper and also see if the problem reproduces on 0.92.
regards, -jean
On Fri, Feb 17, 2012 at 4:24 PM, Jean T. Anderson<[email protected]> wrote:Hi, everyone, I often get an NPE during the YCSB load process if timeseries is set and I'm loading lots of records. Here's the syntax I'm using: YCSB Client 0.1 Command line: -load -db com.yahoo.ycsb.db.HBaseClient -P workloads/workloada -p columnfamily=family -p recordcount=10000000 -threads 32 -s -p measurementtype=timeseries -p timeseries.granularity=5000 100 million records load successfully with 32 threads if timeseries is not set. But when I set timeseries, I often get NPEs with stacks that move around depending on the number of records and the timeseries granularity. For example: 1) 10 million records gets an NPE when timeseries is enabled with a granularity of 5000 ms (but 4000 ms loads successfully): java.lang.NullPointerException at org.apache.hadoop.hbase.util.Bytes.compareTo(Bytes.java:916) at org.apache.hadoop.hbase.util.Bytes$ByteArrayComparator.compare(Bytes.java:109) at org.apache.hadoop.hbase.util.Bytes$ByteArrayComparator.compare(Bytes.java:101) at java.util.TreeMap$NavigableSubMap.checkUpperBound(TreeMap.java:2666) at java.util.TreeMap$NavigableSubMap.isInRange(TreeMap.java:2688) at java.util.TreeMap$NavigableSubMap.get(TreeMap.java:2502) at org.apache.hadoop.hbase.util.SoftValueSortedMap.get(SoftValueSortedMap.java:96) at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getCachedLocation(HConnectionManager.java:826) 2) 100 million records gets an NPE with 4000 ms (note the changed stack): java.lang.NullPointerException at org.apache.hadoop.hbase.util.Bytes.compareTo(Bytes.java:916) at org.apache.hadoop.hbase.util.Bytes$ByteArrayComparator.compare(Bytes.java:109) at org.apache.hadoop.hbase.util.Bytes$ByteArrayComparator.compare(Bytes.java:101) at java.util.TreeMap$NavigableSubMap.cmp(TreeMap.java:2748) at java.util.TreeMap$NavigableSubMap.findLowerEntryImpl(TreeMap.java:2881) at java.util.TreeMap$NavigableSubMap.findLowerEntry(TreeMap.java:3000) at java.util.TreeMap$NavigableSubMap.smallerEntry(TreeMap.java:2994) at java.util.TreeMap$AscendingSubMapIterator.getBoundaryNode(TreeMap.java:281) at java.util.TreeMap$AbstractSubMapIterator.<init>(TreeMap.java:186) at java.util.TreeMap$AscendingSubMapKeySet.iterator(TreeMap.java:1968) at java.util.TreeMap$NavigableSubMap.isEmpty(TreeMap.java:2477) at org.apache.hadoop.hbase.util.SoftValueSortedMap.isEmpty(SoftValueSortedMap.java:151) at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getCachedLocation(HConnectionManager.java:826) 3) 100 million records gets an NPE with 3000 ms (and the stack changes): java.lang.NullPointerException at org.apache.hadoop.hbase.util.Bytes.compareTo(Bytes.java:916) at org.apache.hadoop.hbase.util.Bytes$ByteArrayComparator.compare(Bytes.java:109) at org.apache.hadoop.hbase.util.Bytes$ByteArrayComparator.compare(Bytes.java:101) at java.util.TreeMap.cmp(TreeMap.java:4514) at java.util.TreeMap.get(TreeMap.java:4386) at org.apache.hadoop.hbase.util.SoftValueSortedMap.get(SoftValueSortedMap.java:96) at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getCachedLocation(HConnectionManager.java:830) I found HBASE-3878, but it looks like that was fixed in 0.90.4. I also found HBASE-5088, which is marked fixed in 0.90.6 -- does anyone recognize if this problem fits that profile? many thanks, -jean
