[ https://issues.apache.org/jira/browse/CASSANDRA-14069?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sergey Lapukhov updated CASSANDRA-14069: ---------------------------------------- Description: Cluster was flooded with SSTables. A table had ~20000 sstables. Write requests started failing. Steps to reproduce: * Create cluster with 3 nodes * Specify {code:java} memtable_heap_space_in_mb: 10 {code} in cassandra.yaml * Create table standard1 in keyspace1 (for the cassandra-stress tool) with the script [^create.cql]. Please note {code:java} compaction = {'class': 'SizeTieredCompactionStrategy', 'enabled': 'false'} {code} i.e. node will not perform compaction. * Populate node with data: {code:java} cassandra-stress write n=1000000000 -node 127.0.0.1 {code} * After node was populated, put both read and write pressure on it: {code:java} cassandra-stress read n=1000000000 -node 127.0.0.1 cassandra-stress write n=1000000000 -node 127.0.0.1 {code} * While still under pressure, enable LeveledCompactionStrategy {code:java} echo "ALTER TABLE keyspace1.standard1 WITH compaction = { 'class' : 'LeveledCompactionStrategy', 'sstable_size_in_mb' : 1 }; DESC keyspace1.standard1; exit" | bin/cqlsh; {code} *Results:* Write requests failing, read requests still processed. 'bin/nodetool cfstats' and 'bin/nodetool compactionstats' commands hanging, if issued from the node running cassandra-stress tool. If issued from another node: {code:java} $ bin/nodetool cfstats ... Table: standard1 SSTable count: 22637 SSTables in each level: [22651/4, 0, 0, 0, 0, 0, 0, 0, 0] ... {code} {code:java} $ bin/nodetool compactionstats pending tasks: 12656 id compaction type keyspace table completed total unit progress 935bbc00-d03b-11e7-a47d-2b44293495b8 Compaction keyspace1 standard1 59556014 59557860 bytes 100.00% a29ee660-d03b-11e7-a47d-2b44293495b8 Compaction keyspace1 standard1 80432114 742151655 bytes 10.84% 9766e400-d03b-11e7-a47d-2b44293495b8 Compaction keyspace1 standard1 58891604 58893215 bytes 100.00% 9cdc9880-d03b-11e7-a47d-2b44293495b8 Compaction keyspace1 standard1 20289449 20290800 bytes 99.99% 90f98910-d03b-11e7-a47d-2b44293495b8 Compaction keyspace1 standard1 59689824 59695545 bytes 99.99% 986ede20-d03b-11e7-a47d-2b44293495b8 Compaction keyspace1 standard1 40598594 40598820 bytes 100.00% 9cd322a0-d03b-11e7-a47d-2b44293495b8 Compaction keyspace1 standard1 60756739 60766660 bytes 99.98% {code} Special note about 'bin/nodetool compactionstats' - picture above is quite typical for this issue. I.e. compaction tasks manage to make it through, but hinder near the full completion (around 99.9 %). was: Cluster was flooded with SSTables. A table had ~20000 sstables. Write requests started failing. Steps to reproduce: * Create cluster with 3 nodes * Specify {code:java} memtable_heap_space_in_mb: 10 {code} in cassandra.yaml * Create table standard1 in keyspace1 (for the cassandra-stress tool) with the script [^create.cql]. Please note bq. compaction = {'class': 'SizeTieredCompactionStrategy', 'enabled': 'false'} i.e. node will not perform compaction. * Populate node with data: {{cassandra-stress write n=1000000000 -node 127.0.0.1}} * After node was populated, put both read and write pressure on it: {{cassandra-stress read n=1000000000 -node 127.0.0.1}} {{cassandra-stress write n=1000000000 -node 127.0.0.1}} * While still under pressure, enable LeveledCompactionStrategy bq. echo "ALTER TABLE keyspace1.standard1 WITH compaction = { 'class' : 'LeveledCompactionStrategy', 'sstable_size_in_mb' : 1 }; DESC keyspace1.standard1; exit" | bin/cqlsh; *Results:* Write requests failing, read requests still processed. 'bin/nodetool cfstats' and 'bin/nodetool compactionstats' commands hanging, if issued from the node running cassandra-stress tool. If issued from another node: {code:java} $ bin/nodetool cfstats ... Table: standard1 SSTable count: 22637 SSTables in each level: [22651/4, 0, 0, 0, 0, 0, 0, 0, 0] ... {code} {{$ bin/nodetool compactionstats pending tasks: 12656 id compaction type keyspace table completed total unit progress 935bbc00-d03b-11e7-a47d-2b44293495b8 Compaction keyspace1 standard1 59556014 59557860 bytes 100.00% a29ee660-d03b-11e7-a47d-2b44293495b8 Compaction keyspace1 standard1 80432114 742151655 bytes 10.84% 9766e400-d03b-11e7-a47d-2b44293495b8 Compaction keyspace1 standard1 58891604 58893215 bytes 100.00% 9cdc9880-d03b-11e7-a47d-2b44293495b8 Compaction keyspace1 standard1 20289449 20290800 bytes 99.99% 90f98910-d03b-11e7-a47d-2b44293495b8 Compaction keyspace1 standard1 59689824 59695545 bytes 99.99% 986ede20-d03b-11e7-a47d-2b44293495b8 Compaction keyspace1 standard1 40598594 40598820 bytes 100.00% 9cd322a0-d03b-11e7-a47d-2b44293495b8 Compaction keyspace1 standard1 60756739 60766660 bytes 99.98% }} Special note about 'bin/nodetool compactionstats' - picture above is quite typical for this issue. I.e. compaction tasks manage to make it through, but hinder near the full completion (around 99.9 %). > Node stopped serving write requests when a table has a lot of sstables > ---------------------------------------------------------------------- > > Key: CASSANDRA-14069 > URL: https://issues.apache.org/jira/browse/CASSANDRA-14069 > Project: Cassandra > Issue Type: Bug > Components: Core > Reporter: Sergey Lapukhov > Attachments: create.cql, stack.txt > > > Cluster was flooded with SSTables. A table had ~20000 sstables. Write > requests started failing. > Steps to reproduce: > * Create cluster with 3 nodes > * Specify > {code:java} > memtable_heap_space_in_mb: 10 > {code} > in cassandra.yaml > * Create table standard1 in keyspace1 (for the cassandra-stress tool) with > the script [^create.cql]. Please note > {code:java} compaction = {'class': 'SizeTieredCompactionStrategy', 'enabled': > 'false'} {code} > i.e. node will not perform compaction. > * Populate node with data: > {code:java} cassandra-stress write n=1000000000 -node 127.0.0.1 {code} > * After node was populated, put both read and write pressure on it: > {code:java} cassandra-stress read n=1000000000 -node 127.0.0.1 > cassandra-stress write n=1000000000 -node 127.0.0.1 {code} > * While still under pressure, enable LeveledCompactionStrategy > {code:java} echo "ALTER TABLE keyspace1.standard1 WITH compaction = { > 'class' : 'LeveledCompactionStrategy', 'sstable_size_in_mb' : 1 }; DESC > keyspace1.standard1; exit" | bin/cqlsh; {code} > *Results:* > Write requests failing, read requests still processed. > 'bin/nodetool cfstats' and 'bin/nodetool compactionstats' commands hanging, > if issued from the node running cassandra-stress tool. > If issued from another node: > {code:java} > $ bin/nodetool cfstats > ... > Table: standard1 > SSTable count: 22637 > SSTables in each level: [22651/4, 0, 0, 0, 0, 0, 0, 0, 0] > ... > {code} > {code:java} > $ bin/nodetool compactionstats > pending tasks: 12656 > id compaction type keyspace > table completed total unit progress > 935bbc00-d03b-11e7-a47d-2b44293495b8 Compaction keyspace1 > standard1 59556014 59557860 bytes 100.00% > a29ee660-d03b-11e7-a47d-2b44293495b8 Compaction keyspace1 > standard1 80432114 742151655 bytes 10.84% > 9766e400-d03b-11e7-a47d-2b44293495b8 Compaction keyspace1 > standard1 58891604 58893215 bytes 100.00% > 9cdc9880-d03b-11e7-a47d-2b44293495b8 Compaction keyspace1 > standard1 20289449 20290800 bytes 99.99% > 90f98910-d03b-11e7-a47d-2b44293495b8 Compaction keyspace1 > standard1 59689824 59695545 bytes 99.99% > 986ede20-d03b-11e7-a47d-2b44293495b8 Compaction keyspace1 > standard1 40598594 40598820 bytes 100.00% > 9cd322a0-d03b-11e7-a47d-2b44293495b8 Compaction keyspace1 > standard1 60756739 60766660 bytes 99.98% > {code} > Special note about 'bin/nodetool compactionstats' - picture above is quite > typical for this issue. I.e. compaction tasks manage to make it through, but > hinder near the full completion (around 99.9 %). -- This message was sent by Atlassian JIRA (v6.4.14#64029) --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org For additional commands, e-mail: commits-h...@cassandra.apache.org