Is the testing code simple enough to attach to this ticket? I ask because others might want to replicate your results.
On Thu, Jun 21, 2012 at 12:27 PM, Keith Turner (JIRA) <[email protected]> wrote: > > [ > https://issues.apache.org/jira/browse/ACCUMULO-624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13398538#comment-13398538 > ] > > Keith Turner commented on ACCUMULO-624: > --------------------------------------- > > A work around for this issue is to enable the block cache for the table. > This will cause rfile blocks to be read into memory and closed immediately, > releasing the decompressor. A decompressor will not be kept for each deep > copy in this case. > > I did some test with the intersecting iterator to verify this. W/o cache > querying 5 terms would allocate 5 decompressors. W/ cache only one > decompressor was allocated. > >> iterators may open lots of compressors >> -------------------------------------- >> >> Key: ACCUMULO-624 >> URL: https://issues.apache.org/jira/browse/ACCUMULO-624 >> Project: Accumulo >> Issue Type: Bug >> Components: tserver >> Reporter: Eric Newton >> Assignee: Keith Turner >> >> A large iterator tree may create many instances of Compressors. These >> instances are pulled from a pool that never decreases in size. So, if 50 >> simultaneous queries are run over dozens of files, each with a complex >> iterator stack, there will be thousands of compressors created. Each of >> these holds a large buffer. This can cause the server to run out of memory. > > -- > This message is automatically generated by JIRA. > If you think it was sent incorrectly, please contact your JIRA > administrators: > https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa > For more information on JIRA, see: http://www.atlassian.com/software/jira > >
