After one of my import scripts had completed importing all data, I tried restarting it to grab any updated data. The first thing it does is grab the most recently updated record:
db.select().from(newClass).order('updatedAt desc').limit(1).one()
However, that caused the following error from my Node script:
Possibly unhandled OrientDB.RequestError: Java heap space
at Operation.parseError (/Users/gsquare567/node_modules/oriento/lib/transport/binary/protocol/operation.js:779:13)
at Operation.consume (/Users/gsquare567/node_modules/oriento/lib/transport/binary/protocol/operation.js:369:35)
at Connection.process (/Users/gsquare567/node_modules/oriento/lib/transport/binary/connection.js:324:17)
at Connection.handleSocketData (/Users/gsquare567/node_modules/oriento/lib/transport/binary/connection.js:250:17)
at Socket.emit (events.js:95:17)
at Socket.<anonymous> (_stream_readable.js:748:14)
at Socket.emit (events.js:92:17)
at emitReadable_ (_stream_readable.js:410:10)
at emitReadable (_stream_readable.js:406:5)
at readableAddChunk (_stream_readable.js:168:9)
And I received the following server output:
java.lang.OutOfMemoryError: GC overhead limit exceeded
Dumping heap to java_pid1694.hprof ...
Heap dump file created [2055557443 bytes in 37.799 secs]
Error on fetching record during browsing. The record has been skipped
Error on retrieving record #11:1023466 (cluster: user)
-> com.orientechnologies.orient.core.db.raw.ODatabaseRaw.read(ODatabaseRaw.java:252)
-> com.orientechnologies.orient.core.db.record.ODatabaseRecordAbstract.executeReadRecord(ODatabaseRecordAbstract.java:1017)
-> com.orientechnologies.orient.core.tx.OTransactionNoTx.loadRecord(OTransactionNoTx.java:65)
-> com.orientechnologies.orient.core.db.record.ODatabaseRecordTx.load(ODatabaseRecordTx.java:264)
-> com.orientechnologies.orient.core.db.record.ODatabaseRecordTx.load(ODatabaseRecordTx.java:40)
-> com.orientechnologies.orient.core.iterator.OIdentifiableIterator.readCurrentRecord(OIdentifiableIterator.java:285)
-> com.orientechnologies.orient.core.iterator.ORecordIteratorClusters.hasNext(ORecordIteratorClusters.java:139)
-> com.orientechnologies.orient.core.sql.OCommandExecutorSQLSelect.fetchFromTarget(OCommandExecutorSQLSelect.java:913)
-> com.orientechnologies.orient.core.sql.OCommandExecutorSQLSelect.executeSearch(OCommandExecutorSQLSelect.java:397)
-> com.orientechnologies.orient.core.sql.OCommandExecutorSQLSelect.execute(OCommandExecutorSQLSelect.java:358)
-> com.orientechnologies.orient.core.sql.OCommandExecutorSQLDelegate.execute(OCommandExecutorSQLDelegate.java:60)
-> com.orientechnologies.orient.core.storage.OStorageEmbedded.executeCommand(OStorageEmbedded.java:94)
-> com.orientechnologies.orient.core.storage.OStorageEmbedded.command(OStorageEmbedded.java:83)
-> com.orientechnologies.orient.core.command.OCommandRequestTextAbstract.execute(OCommandRequestTextAbstract.java:59)
-> com.orientechnologies.orient.server.network.protocol.binary.ONetworkProtocolBinary.command(ONetworkProtocolBinary.java:1181)
-> com.orientechnologies.orient.server.network.protocol.binary.ONetworkProtocolBinary.executeRequest(ONetworkProtocolBinary.java:340)
-> com.orientechnologies.orient.server.network.protocol.binary.OBinaryNetworkProtocolAbstract.execute(OBinaryNetworkProtocolAbstract.java:169)
-> com.orientechnologies.common.thread.OSoftThread.run(OSoftThread.java:45)
GC overhead limit exceeded
My other import script, running concurrently, also stopped due to the following:
"error":{"name":"OrientDB.RequestError","message":"Java heap space","data":{},"previous":[],"id":1,"type":"java.lang.OutOfMemoryError","hasMore":0}
After trying to run the original script again, I got the following output in my server:
Exception in thread "OrientDB WAL Flush Task (pumpup)" Error on client connection
Java heap spacejava.lang.OutOfMemoryError: Java heap space
Node script output:
Possibly unhandled OrientDB.RequestError: Java heap space
at Operation.parseError (/Users/gsquare567/node_modules/oriento/lib/transport/binary/protocol/operation.js:779:13)
at Operation.consume (/Users/gsquare567/node_modules/oriento/lib/transport/binary/protocol/operation.js:369:35)
at Connection.process (/Users/gsquare567/node_modules/oriento/lib/transport/binary/connection.js:324:17)
at Connection.handleSocketData (/Users/gsquare567/node_modules/oriento/lib/transport/binary/connection.js:250:17)
at Socket.emit (events.js:95:17)
at Socket.<anonymous> (_stream_readable.js:748:14)
at Socket.emit (events.js:92:17)
at emitReadable_ (_stream_readable.js:410:10)
at emitReadable (_stream_readable.js:406:5)
at readableAddChunk (_stream_readable.js:168:9)
EDIT
After increasing the memory limit to 2GB, I was able to insert 5M records (instead of the previous 2M records) but am still hitting this error.
GC overhead limit exceeded
-> com.orientechnologies.orient.core.db.raw.ODatabaseRaw.read(ODatabaseRaw.java:252)
-> com.orientechnologies.orient.core.db.record.ODatabaseRecordAbstract.executeReadRecord(ODatabaseRecordAbstract.java:1017)
-> com.orientechnologies.orient.core.tx.OTransactionNoTx.loadRecord(OTransactionNoTx.java:65)
-> com.orientechnologies.orient.core.db.record.ODatabaseRecordTx.load(ODatabaseRecordTx.java:264)
-> com.orientechnologies.orient.core.db.record.ODatabaseRecordTx.load(ODatabaseRecordTx.java:40)
-> com.orientechnologies.orient.core.iterator.OIdentifiableIterator.readCurrentRecord(OIdentifiableIterator.java:285)
-> com.orientechnologies.orient.core.iterator.ORecordIteratorClusters.hasNext(ORecordIteratorClusters.java:139)
-> com.orientechnologies.orient.core.sql.OCommandExecutorSQLSelect.fetchFromTarget(OCommandExecutorSQLSelect.java:913)
-> com.orientechnologies.orient.core.sql.OCommandExecutorSQLSelect.executeSearch(OCommandExecutorSQLSelect.java:397)
-> com.orientechnologies.orient.core.sql.OCommandExecutorSQLSelect.execute(OCommandExecutorSQLSelect.java:358)
-> com.orientechnologies.orient.core.sql.OCommandExecutorSQLDelegate.execute(OCommandExecutorSQLDelegate.java:60)
-> com.orientechnologies.orient.core.storage.OStorageEmbedded.executeCommand(OStorageEmbedded.java:94)
-> com.orientechnologies.orient.core.storage.OStorageEmbedded.command(OStorageEmbedded.java:83)
-> com.orientechnologies.orient.core.command.OCommandRequestTextAbstract.execute(OCommandRequestTextAbstract.java:59)
-> com.orientechnologies.orient.server.network.protocol.binary.ONetworkProtocolBinary.command(ONetworkProtocolBinary.java:1181)
-> com.orientechnologies.orient.server.network.protocol.binary.ONetworkProtocolBinary.executeRequest(ONetworkProtocolBinary.java:340)
-> com.orientechnologies.orient.server.network.protocol.binary.OBinaryNetworkProtocolAbstract.execute(OBinaryNetworkProtocolAbstract.java:169)
-> com.orientechnologies.common.thread.OSoftThread.run(OSoftThread.java:45)
Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "Timer-0"
The issue here is that you are trying to sort all 5M records.
That operation have to load whole dataset in memory to sort it (We actually have a plan to optimize it to avoid OOM in this cases, but it is not implemented yet).
So even if you specify limit 1 you load whole bunch of records and query will be slow and consume a lot of memory.
To optimize that query build an index over updatedAt field.